Document:

<PAGE>

                                                                   EXHIBIT 10(f)

      SERVICE REQUEST

K E Y
L E G A C Y
---------------------
                 Plus
---------------------
AMERICAN GENERAL LIFE
--------------------------------------------------------------------------------

KEY LEGACY PLUS--VARIABLE DIVISIONS

AIM Variable Insurance Funds, Inc.
  *  Division 81 - AIM V.I. International Equity Fund

American Century Variable Portfolios, Inc.
  *  Division 82 - VP Value Fund

American General Series Portfolio Company
  *  Division 83 - Money Market Fund

MFS(R)-Variable Insurance Trust
  *  Division 84 - MFS Total Return Series

Neuberger Berman Advisers Management Trust
  *  Division 85 - Partners Portfolio

Oppenheimer Variable Account Funds
  *  Division 86 - Oppenheimer High Income Fund/VA

Putnam Variable Trust
  *  Division 87 - Putnam VT Diversified Income Fund

Franklin Templeton Variable Insurance Products Trust
  *  Division 88 - Franklin Small Cap Fund

Templeton Variable Products Series Fund
  *  Division 89 - Templeton International Fund

Van Kampen Life Investment Trust
  *  Division 90 - Emerging Growth Portfolio

Victory Variable Insurance Funds
  *  Division 91 - Diversified Stock Fund
  *  Division 92 - Investment Quality Bond Fund
  *  Division 93 - Small Cap Opportunity Fund
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<TABLE>
<CAPTION>
                                                                                                                AMERICAN
                                          AMERICAN GENERAL LIFE INSURANCE COMPANY ("AGL")                         | GENERAL
 Complete and return this request to:     -----------------------------------------------                         | FINANCIAL GROUP
  Variable Universal Life Operations        A Subsidiary of American General Corporation
  PO Box 4880 Houston, TX 77210-4880      -----------------------------------------------
          (888) 436-4963 or                                Houston, Texas
Hearing Impaired (TDD): (888) 436-5258
      Toll Free Fax: (877) 445-3098      VARIABLE UNIVERSAL LIFE INSURANCE SERVICE REQUEST
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<S>                         <C>                                                            <C>
[ ] POLICY               1.| POLICY #:___________________________________________________  INSURED:_________________________________
    IDENTIFICATION         |
                           | ADDRESS:________________________________________________________________________ New Address (yes)(no)
COMPLETE THIS SECTION      |
  FOR ALL REQUESTS.        | Primary Owner (If other than insured):__________________________________________
                           |
                           | Address:________________________________________________________________________ New Address (yes)(no)
                           |
                           | Primary Owner's S.S. No. or Tax I.D. No._____________________________ Phone Number: (  )____ - ______
                           |
                           | Joint Owner (If applicable):____________________________________________________
                           |
                           | Address:________________________________________________________________________ New Address (yes)(no)
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[ ] NAME                 2.|
    CHANGE                 | Change Name Of: (Circle One)       Insured    Owner      Payor     Beneficiary
                           |
Complete this section if   | Change Name From: (First, Middle, Last)             Change Name To: (First, Middle, Last)
 the name of the Insured,  |
Owner, Payor or Beneficiary| _________________________________________           _________________________________________________
 has changed. (Please note,|
 this does not change the  |
 Insured, Owner, Payor or  | Reason for Change: (Circle One)   Marriage   Divorce   Correction   Other (Attach copy of legal proof)
 Beneficiary designation)  |
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[ ] MODE OF PREMIUM      3.|
    PAYMENT/BILLING        | Indicate frequency and premium amount desired: $______ Annual  $______ Semi-Annual  $_______ Quarterly
    METHOD CHANGE          |
                           |                                                $______ Monthly (Bank Draft Only)
Use this section to change |
the billing frequence and/ | Indicate billing method desired:_____ Direct Bill ______ Pre-Authorized Bank Draft (attach a Bank Draft
or method of premium pay-  |                                                          Authorization Form and "Void" Check)
 ment. Note, however, that |
AGL will not bill you on a | Start Date: ______/______/_____
direct monthly basis. Refer|
to your policy and its     |
 related prospectus for    |
further information        |
concerning minimum premiums|
and billing options.       |
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[ ] LOST POLICY          4.|
    CERTIFICATE            | I/we hereby certify that the policy of insurance for the listed policy has been ____LOST_____DESTROYED
                           |                                                                                         _____OTHER.
Complete this section if   | Unless I/we have directed cancellation of the policy, I/we request that a:
applying for a Certificate |
 of Insurance or duplicate |            _________ Certificate of Insurance at no charge
policy to replace a lost or|
misplaced policy. If a full|            _________ Full duplicate policy at a charge of $25
 duplicate policy is being |
requested, a check or money|  be issued to me/us. If the original policy is located, I/we will return the Certificate or duplicate
order for $25 payable to   |  policy  to AGL for cancellation.
 AGL must be submitted with|
      this request.        |
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[ ]  DOLLAR COST         5.| Designate the day of the month for transfers:_________(choose a day from 1-28)
     AVERAGING             |
($5,000 minimum initial    | Frequency of transfers (check one): _______Monthly  _______Quarterly ______Semi-Annually _____Annually
accumulation value) An     |
 amount may be deducted    | I want: $___________($100 minimum) taken from the Money Market Division (83) and transferred to the
periodically from the      | following Division(s):
Money Market Division and  |
placed in one or more of   | AIM Variable Insurance Funds, Inc.                 Franklin Templeton Variable Insurance Products Trust
the Divisions listed.      | $_________(81) AIM V.I. International Equity       $________(88) Franklin Small Cap
Please refer to the pros-  | American Century Variable Portfolios, Inc.         Templeton Variable Products Series Fund
 pectus for more infor-    | $_________(82) VP Value                            $________(89) Templeton International
 mation on the Dollar Cost | MFS(R) Variable Insurance Trust                    Van Kampen Life Investment Trust
   Averaging Option.       | $_________(84) MFS Total Return Series             $________(90) Emerging Growth
   This option is not      | Neuberger Berman Advisers Management Trust         Victory Variable Insurance Funds
   available while the     | $_________(85) Partners Portfolio                  $________(91) Diversified Stock
  Automatic Rebalancing    | Oppenheimer Variable Account Funds                 $________(92) Investment Quality Bond
    option is in use.      | $_________(86) Oppenheimer High Income             $________(93) Small Cap Opportunity
                           | Putnam Variable Trust
                           | $_________(87) Putnam VT Diversified Income
                           |
                           | ________INITIAL HERE TO REVOKE DOLLAR COST AVERAGING ELECTION.
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                                                            PAGE 2 OF 4

</TABLE>

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<TABLE>
<CAPTION>
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<S>                         <C>                                                            <C>
[ ] TELEPHONE            6.| I(/we if Joint Owners) hereby authorize AGL to act on telephone instructions to transfer values among
    PRIVILEGE              | Divisions and to change allocations for future purchase payments and monthly deductions.
    AUTHORIZATION          |
                           |
 Complete this section if  | Initial the designation you prefer:
  you are applying for or  |
 revoking current telephone| __________Policy Owner(s) only--If Joint Owners, either one acting independently.
        privileges.        |
                           | __________Policy Owner(s) or Agent/Registered Representative who is appointed to represent AGL and the
                           |           firm authorized to service my policy.
                           |
                           | AGL and any person designated by this authorization will not be responsible for any claim, loss or
                           | expense based upon telephone transfer or allocation instructions received and acted upon in good faith,
                           | including losses due to telephone instruction communication errors. AGL's liability for erroneous
                           | transfers or allocations, unless clearly contrary to instructions received, will be limited to
                           | correction of the allocations on a current basis. If an error, objection or other claim arises due to a
                           | telephone transaction, I will notify AGL in writing within five working days from the receipt of the
                           | confirmation of the transaction from AGL. I understand that this authorization is subject to the terms
                           | and provisions of my policy and its related prospectus. This authorization will remain in effect until
                           | my written notice of its revocation is received by AGL at the address printed on the top of this
                           | service request form.
                           |
                           |___________INITIAL HERE TO REVOKE TELEPHONE PRIVILEGE AUTHORIZATION.
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[ ] CORRECT AGE          7.|
                           | Name of Insured for whom this correction is submitted:___________________________________
                           |
Use this section to correct| Correct DOB: ________/________/________
 the age of any person     |
covered under this policy. |
Proof of the correct date  |
 of birth must accompany   |
      this request.        |
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[ ] TRANSFER OF          8.|                                    (Division Name or Number)               (Division Name or Number)
    ACCUMULATED VALUES     |
                           |
                           | Transfer $________ or ______%  from_______________________________to__________________________________
 Use this section if you   |
want to move money between | Transfer $________ or ______%  from_______________________________to__________________________________
 divisions.  If a transfer |
 causes the balance in any | Transfer $________ or ______%  from_______________________________to__________________________________
 division to drop below    |
 $500, AGL reserves the    | Transfer $________ or ______%  from_______________________________to__________________________________
 right to transfer the     |
 remaining balance.        | Transfer $________ or ______%  from_______________________________to__________________________________
Amounts to be transferred  |
  should be indicated in   | Transfer $________ or ______%  from_______________________________to__________________________________
   dollar or percentage    |
   amounts, maintaining    | Transfer $________ or ______%  from_______________________________to__________________________________
  consistency throughout.  |
There is a $500 minimum    | Transfer $________ or ______%  from_______________________________to__________________________________
 amount for division       |
  transfers.               | Transfer $________ or ______%  from_______________________________to__________________________________
                           |
                           | Transfer $________ or ______%  from_______________________________to__________________________________
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[ ] CHANGE IN            9.| INVESTMENT DIVISION                      PREM %  DED %    INVESTMENT DIVISION            PREM %   DED %
    ALLOCATION             | AIM Variable Insurance Funds, Inc.                        Putnam Variable Trust
    PERCENTAGES            | (81) AIM V.I. International Equity      ______  ______    (87) Putnam VT Diversified Income
                           | American Century Variable Portfolios, Inc.                                              ______  ______
  Use this section to      | (82) VP Value                           ______  ______    Franklin Templeton Variable Insurance
indicate how premiums or   | American General Series Portfolio Company                 Products Trust
 monthly deductions are to | (83) Money Market                       ______  ______    (88) Franklin Small Cap       ______  ______
   be allocated. Total     | MFS(R) Variable Insurance Trust                           Templeton Variable Products Series Fund
    allocation in each     | (84) MFS Total Return Series            ______  ______    (89) Templeton International  ______  ______
column must equal 100%;    | Neuberger Berman Advisers Management Trust                Van Kampen Life Investment Trust
   whole numbers only.     | (85) Partners Portfolio                 ______  ______    (90) Emerging Growth          ______  ______
                           | Oppenheimer Variable Account Funds                        Victory Variable Insurance Funds
                           | (86) Oppenheimer High Income            ______  ______    (91) Diversified Stock        ______  ______
                                                                                       (92) Investment Quality Bond  ______  ______
                                                                                       (93) Small Cap Opportunity    ______  ______
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                                                            PAGE 3 OF 4
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AGLC 0092

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<TABLE>
<CAPTION>

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<S>                        |<C>                                                            <C>
[ ] AUTOMATIC           10.| Indicate frequency: _______ Quarterly ______ Semi-Annually ______ Annually
    REBALANCING            |
                           |                    (Division Name or Number)                       (Division Name or Number)
                           |
    ($5,000 minimum        | _______%   _______________________________________ :    _________% __________________________________:
 accumulation value) Use   |
this section to apply for  | _______%   _______________________________________ :    _________% __________________________________:
   or make changes to      |
Automatic Rebalancing of   | _______%   _______________________________________ :    _________% __________________________________:
 the divisions.            |
   Please refer to the     | _______%   _______________________________________ :    _________% __________________________________:
   prospectus for more     |
    information on the     | _______%   _______________________________________ :    _________% __________________________________:
  Automatic Rebalancing    |
Option. This option is not | _______%   _______________________________________ :    _________% __________________________________:
available while the Dollar |
 Cost Averaging Option is  |
        in use.            |  _________INITIAL HERE TO REVOKE AUTOMATIC REBALANCING ELECTION.
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[ ] REQUEST FOR         11.|  _________I request a partial surrender of $_________ or ________% of the net cash surrender value.
    PARTIAL                |
    SURRENDER/             |  _________I request a loan in the amount of $________.
    POLICY LOAN            |
                           |  _________I request the maximum loan amount available from my policy.
 Use this section to apply |
  for a partial surrender  | Unless you direct otherwise below, proceeds are allocated according to the deduction allocation
   or policy loan. If      | percentages in effect, if available; otherwise they are taken pro-rata from the Variable Divisions
  applying for a partial   | in use.
   surrender, be sure to   |
  complete the Notice of   | ______________________________________________________________________________________________________
Withholding section of this|
Service Request in addition| ______________________________________________________________________________________________________
     to this section.      |
   The minimum surrender   | ______________________________________________________________________________________________________
amount is $500. There will |
 be a charge not to exceed | ______________________________________________________________________________________________________
2% of the amount withdrawn |
        or $25.            | ______________________________________________________________________________________________________
 Refer to your policy and  |
its related prospectus for |
   further information.    |
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[ ] NOTICE OF           12.| The taxable portion of the distribution you receive from your variable universal life insurance policy
    WITHHOLDING            | is subject to federal income tax withholding unless you elect not to have withholding apply.
                           | Withholding of state income tax may also be required by your state of residence. You may elect not to
 Complete this section if  | have withholding apply by checking the appropriate box below. If you elect not to have withholding
  you have applied for a   | apply to your distribution or if you do not have enough income tax withheld, you may be responsible for
   partial surrender in    | payment of estimated tax. You may incur penalties under the estimated tax rules, if your withholding
       Section 11.         | and estimated tax are not sufficient.
                           |
                           | Check one: _______ I do want income tax withheld from this distribution.
                           |
                           |            _______ I do not want income tax withheld from this distribution.
                           |
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[ ] AFFIRMATION/        13.| CERTIFICATION: Under penalties of perjury, I certify: (1) that the number shown on this form is my
    SIGNATURE              | correct taxpayer identification number and; (2) that I am not subject to backup withholding under
                           | Section 3406(a)(1)(C) of the Internal Revenue Code. The Internal Revenue Service does not require your
Complete this section for  | consent to any provision of this document other than the certification required to avoid backup
       ALL requests.       | withholding.
                           |
                           | Dated at __________________________________ this _________ day of ________________________, __________.
                           |                                                                           (MONTH)              (YEAR)
                           |
                           |  X_________________________________________________      X_____________________________________________
                           |   SIGNATURE OF OWNER                                      SIGNATURE OF WITNESS
                           |
                           |  X_________________________________________________      X_____________________________________________
                           |   SIGNATURE OF JOINT OWNER                                SIGNATURE OF WITNESS
                           |
                           |  X_________________________________________________      X_____________________________________________
                           |   SIGNATURE OF ASSIGNEE                                   SIGNATURE OF WITNESS
                           |
                           |
                           |
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                                                            PAGE 4 OF 4
</TABLE>
AGLC 0092<PAGE>

                                                                   Exhibit 10.47

                       AMENDMENT NO. 6 TO CREDIT AGREEMENT

         AMENDMENT dated as of January 20, 2000 (the "AMENDMENT") to the Amended
and Restated Credit Agreement dated as of February 28, 1999 and amended as of
May 31, 1999, September 14, 1999, November 15, 1999, December 10, 1999 and
January 10, 2000 (as amended, the "CREDIT AGREEMENT") among LAROCHE INDUSTRIES
INC. (the "BORROWER"), the LENDERS party thereto (the "LENDERS") and THE CHASE
MANHATTAN BANK, as Administrative Agent (the "ADMINISTRATIVE AGENT").

                              W I T N E S S E T H :

         WHEREAS, the Borrower has requested that the Lenders agree (i) to amend
certain of the provisions of the Credit Agreement requiring certain reductions
in the Borrowing Base scheduled to occur on January 20, 2000 and (ii) to waive
the Borrower's obligation to comply with certain covenants solely for the period
January 20, 2000 through March 10, 2000; and

         WHEREAS, subject to the terms and conditions set forth herein, the
Lenders have agreed to make certain amendments and waivers as provided for
herein;

         NOW, THEREFORE, the parties hereto agree as follows:

         SECTION 1. DEFINED TERMS; REFERENCES. Unless otherwise specifically
defined herein, each term used herein that is defined in the Credit Agreement
has the meaning assigned to such term in the Credit Agreement. Each reference to
"hereof", "hereunder", "herein" and "hereby" and each other similar reference
and each reference to "this Agreement" and each other similar reference
contained in the Credit Agreement shall, from and after Amendment No. 6
Effective Date (defined below), refer to the Credit Agreement as amended hereby.

         SECTION 2.  SECTION 1.01.  Section 1.01 of the Credit Agreement is
amended:

          (a) by amending the definition of "BORROWING BASE" to read in its
entirety as follows:

                  "BORROWING BASE" means, at any date, the amount of the
         Borrowing Base as of the date of the Borrowing Base Certificate then
         most recently delivered by the Borrower pursuant to Section 5.01(l)
         (the "BORROWING BASE

<PAGE>

        DATE"), determined by calculating the sum of (i) 85% of the aggregate
        amount of Eligible Receivables at the Borrowing Base Date PLUS (ii) 50%
        of the aggregate amount of Eligible Inventory at the Borrowing Base Date
        PLUS (iii) the Facilities Domestic Amount at the Borrowing Base Date
        PLUS (iv) (A) as of any Borrowing Base Date occurring on or prior to the
        earlier of (1) the time at which the Borrower receives a Deemed Foreign
        Assets Termination Notice and (2) March 10, 2000, the greater of the
        Deemed Foreign Assets Amount or the Facilities Foreign Amount and (B) as
        of any subsequent Borrowing Base Date, the Facilities Foreign Amount.

                  and (b) by inserting therein in appropriate alphabetical order
        the following defined terms:

                  "AMENDMENT NO. 6 EFFECTIVE DATE" means the date of
        effectiveness of Amendment No. 6 to this Agreement.

                  "DEEMED FOREIGN ASSETS TERMINATION NOTICE" means a written
        notice, signed by the Required Lenders in their sole discretion,
        advising the Borrower that the Deemed Foreign Assets Amount may not,
        subsequent to the time of such notice, be included in the Borrowing
        Base.

                  SECTION 3. SECTION 2.11. Section 2.11 of the Credit Agreement
        is amended by relettering clause (f) thereof as clause (g) and by
        adding a new clause (f) immediately after clause (e) thereof, to read
        in its entirety as follows:

                  (f) The Borrower agrees to pay to the Administrative Agent
        (for the account of the Lenders pro rata in proportion to the sum of
        each Lender's Revolving Commitment and outstanding Term Loans as of the
        Amendment No. 6 Effective Date) an amendment fee in connection with
        Amendment No. 6 to this Agreement, in an amount equal to $150,000.00.
        This fee shall be fully earned as of the Amendment No. 6 Effective
        Date, and shall be paid by the Borrower on or before the later of March
        10, 2000 or such later date as shall be agreed to by the Required
        Lenders.

                 SECTION 4. SECTION 4.03. Solely with respect to any Loan to be
        made on the occasion of any Borrowing occurring on or after the
        Amendment No. 6 Effective Date and on or prior to March 10, 2000 or any
        Letter of Credit to be issued, amended, renewed or extended on or after
        the Amendment No. 6 Effective Date and on or prior to March 10, 2000,
        the Lenders waive any failure by the Borrower to satisfy the condition
        precedent set forth in Section 4.03(b) of the Credit Agreement solely
        with respect to the

                                       2
<PAGE>

        truth and correctness of the representation and warranty contained in
        Section 3.04(c) of the Credit Agreement, but solely to the extent that
        such representation and warranty is not true and correct because of
        facts, conditions or events that have been disclosed in writing by the
        Borrower to the Administrative Agent and the Lenders prior to January
        14, 2000.

            SECTION 5. SECTIONS 6.12, 6.13 AND 6.14. The Lenders hereby waive,
        solely for the period from and including the Amendment No. 6 Effective
        Date and to and including the earlier of (1) the time at which the
        Borrower receives a Deemed Foreign Assets Termination Notice and (2)
        March 10, 2000 (the "Waiver Period"), (i) the requirement that the
        Borrower comply with Sections 6.12, 6.13 and 6.14 of the Credit
        Agreement and (ii) any Default arising under clause (d) of Article 7 of
        the Credit Agreement as a result of the Borrower's failure to comply
        with Sections 6.12, 6.13 and 6.14 during the Waiver Period.

            SECTION 6. NO OTHER WAIVERS. Other than as specifically provided
        herein, nothing contained herein and no action by, or inaction on the
        part of, any Lender or the Administrative Agent shall, or shall be
        deemed to, operate as a waiver of any right, remedy, power or privilege
        of the Administrative Agent or of any Lender under the Credit Agreement
        or any other Loan Document or of any other term or condition of the
        Credit Agreement or any other Loan Document.

            SECTION 7. REPRESENTATIONS AND WARRANTIES. The Borrower represents
        and warrants that, on and as of the Amendment No. 6 Effective Date and
        after giving effect to this Amendment, (i) the representations and
        warranties of the Obligors set forth in the Loan Documents, including
        but not limited to the representation and warranty contained in Section
        3.12 of the Credit Agreement but excluding the representation and
        warranty contained in section 3.04(c) of the Credit Agreement, are true
        and correct and (ii) no Default has occurred and is continuing.

            SECTION 8. GOVERNING LAW. This Amendment shall be governed by and
        construed in accordance with the laws of the State of New York.

            SECTION 9. COUNTERPARTS. This Amendment may be signed in any number
        of counterparts, each of which shall be an original, with the same
        effect as if the signatures thereto and hereto were upon the same
        instrument.

                                       3
<PAGE>

            SECTION 10. EFFECTIVENESS. This Amendment shall become effective on
        the date (the "AMENDMENT NO. 6 EFFECTIVE DATE") on which the
        Administrative Agent shall have received:

                  (i) from each of the Borrower and the Required Lenders a
        counterpart hereof signed by such party or facsimile or other written
        confirmation (in form satisfactory to the Administrative Agent) that
        such party has signed a counterpart hereof;

                 (ii) a certificate of the Chief Financial Officer certifying
        that the representations and warranties made by the Borrower pursuant
        to Section 6 of this Amendment are true and correct on and as of the
        Amendment No. 6 Effective Date; and

                 (iii) evidence satisfactory to it that the Borrower has paid
        in full all fees and expenses of the Administrative Agent payable
        pursuant to Section 9.03(a) of the Credit Agreement with respect to
        which the Borrower shall have received any invoice delivered to the
        Borrower at least one Business Day prior to the Amendment No. 6
        Effective Date, it being understood that the failure of the
        Administrative Agent to have provided invoices with respect to such
        fees and expenses prior to the Amendment No. 6 Effective Date does not
        constitute a waiver of, or otherwise affect, the Administrative Agent's
        right to reimbursement for such fees and expenses.

                                       4
<PAGE>

                  IN WITNESS WHEREOF, the parties hereto have caused this Sixth
         Amendment to be duly executed as of the date first above written.

                                            LAROCHE INDUSTRIES INC.

                                            By:
                                                --------------------------------
                                                 Name:
                                                 Title:

                                            THE CHASE MANHATTAN BANK

                                            By:
                                                --------------------------------
                                                 Name:
                                                 Title:

                                            HIBERNIA NATIONAL BANK

                                            By:
                                                --------------------------------
                                                 Name:
                                                 Title:

                                            WACHOVIA BANK, N.A.

                                            By:
                                                --------------------------------
                                                 Name:
                                                 Title:

                                       5
<PAGE>

                                            THE BANK OF NOVA SCOTIA

                                            By:
                                                --------------------------------
                                                 Name:
                                                 Title:

                                            By:
                                                --------------------------------
                                                 Name:
                                                 Title:

                                            PNC BANK, NATIONAL ASSOCIATION

                                            By:
                                                --------------------------------
                                                 Name:
                                                 Title:

                                            AMSOUTH BANK

                                            By:
                                                --------------------------------
                                                 Name:
                                                 Title:

                                            BHF (USA) CAPITAL CORPORATION

                                            By:
                                                --------------------------------
                                                 Name:
                                                 Title:

                                            By:
                                                --------------------------------
                                                 Name:
                                                 Title:

                                       6
<PAGE>

                                            COMERICA BANK

                                            By:
                                                --------------------------------
                                                 Name:
                                                 Title:

                                            NATIONAL BANK OF CANADA

                                            By:
                                                --------------------------------
                                                 Name:
                                                 Title:

                                            By:
                                                --------------------------------
                                                 Name:
                                                 Title:

                                           PARIBAS

                                            By:
                                                --------------------------------
                                                 Name:
                                                 Title:

                                            By:
                                                --------------------------------
                                                 Name:
                                                 Title:

                                       7

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