From: Rima Howell/RTP/USEPA/US 

To: Robin Segall/RTP/USEPA/US@EPA, Tom Driscoll/RTP/USEPA/US@EPA 

Date: 03/05/2010 07:21 AM 

Subject: Fw: Quick Question: PS-15 

Please see Jeff's message below - detection limits should not be a problem 

Rima 

----- Forwarded by Rima Howell/RTP/USEPA/US on 03/05/2010 07:20 AM ----- 

RE: Quick Question: PS-15

Jeffrey LaCosse to

: 

Rima Howell 

 

Hi Rima, 

One does not need a special cell. We detect HCl at about 50 ppb levels with 

a 3.2 meter pathlength at 0.5 cm-1 resolution. 20 meters is actually a bit 

long and can cause problems in measurement of other species at higher 

levels. 

Regards, 

Jeff 

Jeffrey P. LaCosse, Ph.D. 

President and Principal Scientist 

Spectral Insights LLC 

spectralinsights.com 

Office: Laboratory: 

214 Argonne Drive 3536 Durham Road 

Durham, NC 27704 Raleigh, NC 27614 

Phone: 919-620-6549 

Mobile: 919-949-5432 

Fax: 919-471-6179 

-----Original Message----- 

From: Howell.Rima@epamail.epa.gov [mailto:Howell.Rima@epamail.epa.gov] 

Sent: Thursday, March 04, 2010 7:04 AM 

To: j.lacosse@gte.net 

Subject: Fw: Quick Question: PS-15 

Hey Jeff, 

 I know you have a 20 m cell that can improve detection limits, but 

can it measure down to under 2 ppm - if so, can it be used as part of a 

CEMS package? Do you even need a special cell to see HCl at those 

levels? 
Thanks. 

Rima 

----- Forwarded by Rima Howell/RTP/USEPA/US on 03/04/2010 07:02 AM ----- 

|------------> 

| From: | 

|------------> 

 >------------------------------------------------------------------------- 

-------------------------------------------------------------------| 

 |Robin Segall/RTP/USEPA/US 

| 

 >------------------------------------------------------------------------- 

-------------------------------------------------------------------| 

|------------> 

| To: | 

|------------> 

 >------------------------------------------------------------------------- 

-------------------------------------------------------------------| 

 |Rima Howell/RTP/USEPA/US@EPA 

| 

 >------------------------------------------------------------------------- 

-------------------------------------------------------------------| 

|------------> 

| Cc: | 

|------------> 

 >------------------------------------------------------------------------- 

-------------------------------------------------------------------| 

 |Tom Driscoll/RTP/USEPA/US@EPA 

| 

 >------------------------------------------------------------------------- 

-------------------------------------------------------------------| 

|------------> 

| Date: | 

|------------> 

 >------------------------------------------------------------------------- 

-------------------------------------------------------------------| 

 |03/03/2010 04:13 PM 

| 

 >------------------------------------------------------------------------- 

-------------------------------------------------------------------| 

|------------> 

| Subject: | 

|------------> 

 >------------------------------------------------------------------------- 

-------------------------------------------------------------------| 

 |Quick Question: PS-15 

Hi Rima, 

First, some background.......PS-15 has been cited as the HCl monitoring 

specification in the proposed amendments to Cement MACT (since we know 

that FTIR technology can measure HCl from cement plants). 

Comments on proposed reg cite problems with using FTIR CEMS to measure 

down in 2 ppm range. 

Question, from your perspective is that a reasonable complaint? Over 

the years, have you gotten any feedback from the real world on 

application of FTIR CEMS? For HCl, in particular, perhaps? Do they work 

well? (I have heard from one MWC rep that they love theirs.) 

Can you please write back to Tom Driscoll as he has an important meeting 

on this tomorrow afternoon. Thanks much! 
Robin