Document:

<PRE>

                                                                   Exhibit 10.31

                              SYBRON CHEMICALS INC.

                            SHARE PARTICIPATION PLAN

                                 AMENDMENT NO. 2

                  Sybron Chemicals Inc., a Delaware corporation (hereinafter
called the "Company") established, effective June 11, 1990, the "Sybron Chemical
Industries Inc. Share Participation Plan", renamed the "Sybron Chemicals Inc.
Share Participation Plan" (hereinafter the "Plan").  On October 30, 1992, the
Plan was first amended through the adoption of Amendment No. 1.

                  The Committee desires to further amend the Plan as hereinafter
set forth.

                NOW, THEREFORE,  subject to the  approval  of the Board of
Directors of the Company, the Plan is hereby amended as follows:

                  1.       Paragraph 1, subparagraph (d) of the Plan is hereby
amended to read in its entirety as follows:

                  "(d)     "Committee" shall mean a committee comprised of R.M.
Klein, S.F. Ladin, J.H. Schroeder and S.R. Adler, or such other persons as shall
be appointed by the Board of Directors of SCI to serve in addition to, or in
lieu of, the aforementioned appointees."

                  2.       Paragraph 1, subparagraph (e)(i) of the Plan is
hereby amended to read in its entirety as follows:

                           "(i) have completed at least one full year of service
                  with the Company or are at the Executive Grade level; provided
                  that,  after  April 1,  2000,  the  Committee  shall  have the
                  discretion to waive such one-year  requirement with respect to
                  any Employee". 3. Paragraph 1, subparagraph (h) of the Plan is
                  hereby amended to read in its entirety as follows:

                           "(h) "Triggering Event" shall mean:

                                     (i) the sale or disposal of substantially
all of the assets of the Company, or

                                    (ii) the date any entity, person or group,
within the meaning of Section 13(d)(3) or Section 14(d)(2) of the Securities
Exchange Act of 1934, as amended, other than the Company or Citigroup or any of
their  subsidiaries,  any employee benefit plan (or related trust) sponsored or
maintained by the Company or any of its subsidiaries,  or any other person or
group in which the present  management of the Company  shall have an  aggregate
equity  interest,  on a fully  diluted basis, of no less than 20%, shall have
become the beneficial  owner of, or shall have  obtained  voting  control  over,
more  than  fifty  percent  (50%) of the outstanding shares of (A) the Company's
Common Stock, or (B) the Common Stock of the Company  resulting from the merger
or  consolidation  of the Company with or into any other entity."

                  4.       Paragraph 3(d) of the Plan is hereby amended to read
in its entirety as follows:
                           "(d) If an Awardee is an Optionee in the Sybron
                  Chemicals Inc. 1992 Stock Option Plan (the "Stock Option
                  Plan") as defined therein, the Stock Option Plan   Committee
                  may   designate  a  number  or  percent  of Participation
                  Shares  awarded  to the  Awardee  which will be canceled prior
                  to a Triggering  Event in conjunction  with the exercise  of a
                  Stock  Option  which  has been  granted  to the Awardee
                  pursuant  to the  Stock  Option  Plan.  The terms and
                  conditions  under  which  such  Participation  Shares  will be
                  canceled  shall  be  set  forth  in  the  Stock  Option  Grant
                  Agreement (the  "Agreement")  made between the Awardee and the
                  Company.  The  Agreement  may  apply to  Participation  Shares
                  awarded  to the  Awardee  before  or  after  the  date  of the
                  Agreement  but prior to the  exercise  of all or a part of the
                  Non-qualified  Stock Option.  Any such  cancellation  shall be
                  duly noted in the registry.  Notwithstanding the foregoing, in
                  no event shall  Participation  Shares  awarded  from and after
                  April 1, 2000 be canceled as a result of the exercise of Stock
                  Options  granted  pursuant  to  the  Stock  Option  Plan."  5.
                  Paragraphs  4(a), 4(b) and 5 of the Plan are hereby amended by
                  replacing all references to the "first anniversary of the
                  Triggering Event" with the "sixth monthly anniversary of the
                  Triggering Event".

                  6.       The Plan in all other respects is hereby ratified and
                  confirmed.

                  IN WITNESS WHEREOF, Sybron Chemicals Inc. has caused this
amendment to the Plan to be signed, effective  April 1, 2000 and its  corporate
seal to be hereunto  affixed by its duly authorized officers this 17th day of
April, 2000.

                                                     Sybron Chemicals Inc.
                                                     By: /s/ Steven F. Ladin

ATTEST:
By:
        (Corporate Seal)
</PRE><PRE>
                                                                Exhibit 10.32

                              SYBRON CHEMICALS INC.
                              EXECUTIVE BONUS PLAN

Section  7(g)(4)  of the  Company's  Executive  Bonus Plan is amended to read as
follows:

         (4) In the event there is no public market either for shares of Company
Common  Stock or for  shares of any  successor  of the  Company as a result of a
Change of Control,  any awards that would otherwise be made in shares of Company
Common under the terms of the Plan shall be made by  converting  the  applicable
number of shares  into cash and  multiplying  such  number of shares by the fair
market  value  of the  Company  Common  Stock as of the  date of the  Change  of
Control.  In the event  there is no public  market for shares of Company  Common
Stock but there is a public market for shares of a successor of the Company as a
result of a Change of Control, any awards that would otherwise be made in shares
of  Company  Common  Stock  under the terms of the Plan  shall be made in common
stock of such  successor  entity.  The amount  number of such  awards  shares of
common stock of the successor  entity shall be calculated  based on the relative
fair market  value of the Company  Common  Stock and of the common  stock of the
successor  entity as of the date of the Change of  Control.  After the date of a
Change of Control, all awards with respect to the two Bonus Years after the date
of immediately  following the year in which the Change of Control occurred shall
be made  exclusively  in cash and in cash or stock of the successor  entity,  by
converting  the  applicable  number of shares  into cash or stock as  determined
above. Thereafter, any provisions of the Plan providing for awards to be made in
the form of Company Common Stock shall be without effect.
</PRE><PAGE>

                                                          Executed in 6 Parts
                                                          Counterpart No. (   )

                              NATIONAL EQUITY TRUST

                            UNIQUE OPPORTUNITIES TRUST

                            REFERENCE TRUST AGREEMENT

     This Reference  Trust Agreement  dated             , 2000 among  Prudential
Securities Incorporated,  as  Depositor  and The Bank of New York,  as Trustee,
sets forth certain provisions in full and incorporates other provisions by
reference to the document  entitled  "National Equity Trust,  Trust Indenture
and Agreement" (the "Basic  Agreement")  dated February 2, 2000. Such provisions
as are set forth in full herein and such provisions as are  incorporated  by
reference  constitute a single instrument (the "Indenture").

                                WITNESSETH THAT:
                                 ---------------

     In  consideration  of the  premises  and of the  mutual  agreements  herein
contained, the Depositor and the Trustee agree as follows:

                                     Part I.
                                     ------

                     STANDARD TERMS AND CONDITIONS OF TRUST

     Subject to the provisions of Part II hereof,  all the provisions  contained
in the Basic  Agreement are herein  incorporated  by reference in their entirety
and  shall be deemed  to be a part of this  instrument  as fully and to the same
extent as though said provisions had been set forth in full in this instrument.

<PAGE>

                                     Part II.
                                     --------

                      SPECIAL TERMS AND CONDITIONS OF TRUST

     The following special terms and conditions are hereby agreed to:

     A. The Trust is denominated National Equity Trust, Unique Opportunities
Trust.

     B. The Units of the Trust shall be subject to a deferred sales charge.

     C. The publicly  traded stocks listed in Schedule A hereto are those which,
subject  to the terms of this  Indenture,  have been or are to be  deposited  in
Trust under this Indenture as of the date hereof.

     D. The term "Depositor" shall mean Prudential Securities Incorporated.

     E. The aggregate  number of Units  referred to in Sections 2.03 and 9.01 of
the Basic Agreement is as of the date hereof.

     F. A Unit of the Trust is hereby  declared  initially equal to 1/ th of the
Trust.

     G. The term "First Settlement Date" shall mean        , 2000.

     H. The terms  "Computation Day" and "Record Date" shall be on the tenth day
of        2000,        2000,      2001 and          2001.

     I. The term "Distribution Date" shall be on the twenty-fifth day of
2000,          2000,         2001 and         2001.

     J. The term "Termination Date" shall mean          , 2001.

     K. The Trustee's Annual Fee shall be $ (per 1,000 Units) for 49,999,999 and
below units outstanding $ (per 1,000 Units) on the next 50,000,000 Units, $ (per
1,000 Units) on the next 100,000,000  Units, and $ (per 1,000 Units) on Units in
excess of 200,000,000  Units. In calculating  the Trustee's  annual fee, the fee
applicable  to the  number  of  units  outstanding  shall  apply  to  all  units
outstanding.

     L. The Depositor's  Portfolio  supervisory service fee shall be $ per 1,000
Units.

               [Signatures and acknowledgments on separate pages]

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