Project Summary. While the testing consisted of obtaining quantitative measurement data on the four measures of CEM performance

Transcription

1 United Sttes Ntionl Risk Mngement Environmentl Protection Reserch Lbortory Agency Cincinnti OH Reserch nd Development EPA/600/SR-97/024 July 1997 Project Summry Testing the Performnce of Rel-Time Incinertor Emission Monitors S.B. Ghorishi, W.E. Whitworth, Jr., C.G. Goldmn, nd L.R. Wterlnd In recently completed test progrm t the U.S. Environmentl Protection Agency (EPA) Incinertion Reserch Fcility (IRF), ten prototype or developing continuous emission monitors (CEMs) for mesuring trce metl or trce orgnic species concentrtions were tested. Of the ten CEMs tested, four mesured concentrtions of severl specific voltile orgnic compounds (VOCs), one mesured totl prticultebound polynucler romtic hydrocrbon concentrtions, two mesured concentrtions of up to 14 trce metls, nd three mesured mercury concentrtions. While the testing consisted of obtining quntittive mesurement dt on the four mesures of CEM performnce checked in reltive ccurcy test udit s described in 40 CFR 60 Appendix F reltive ccurcy (RA), clibrtion drift (CD), zero drift (ZD), nd response time the primry project objective focused on the RA mesurement. The RA mesurement ws chieved by compring the monitored nlyte concentrtion reported by the CEM to the concentrtion determined by the EPA reference method (RM) for the nlyte. Four series of tests were performed, ech simultneously testing up to three monitors mesuring the sme or similr nlyte type. Ech test series consisted of performing triplicte RM mesurements t ech of three trget flue gs monitored nlyte concentrtions while the tested CEMs were in opertion. All mesurements were tken in the wet scrubber exit flue gs from the pilot-scle rotry kiln incinertion system t the IRF. The test progrm results clerly showed the prototype nture of most pproches tested, nd the cler need for further development. Mercury CEMs will require the lest development nd re nerly commercil offerings. However, the pproches tested for multimetls nd VOC determintions require further development. Given this need, the importnce of continuing test progrms of the scope nd scle of this one cnnot be overemphsized. This Project Summry ws developed by EPA s Ntionl Risk Mngement Reserch Lbortory, Cincinnti, OH, to nnounce key findings of the reserch project tht is fully documented in seprte report of the sme title (see Project Report ordering informtion t bck). Introduction EPA is currently developing more stringent emission stndrds nd considering chnges in the wy tht permits for wste combustion fcilities re hndled. More public involvement in the process hs been proposed. Becuse the public s pprent perception of incinertors is tht high concentrtions of hzrdous compounds re continully being relesed from the stcks of the therml tretment devices, mens by which the rel-time (defined s rnging from instntneous to within severl hours) orgnic nd metls emissions cn be monitored would be of gret benefit to both regultors nd the regulted commu-

2 nity. The bility to hve immedite knowledge of stck emissions would provide ssurnces tht the therml tretment device is operting correctly or indicte the chnge of operting conditions needed to djust stck emissions. Thus, hving this monitoring cpbility would constitute one mens of responding to nd llying the public s fers by showing tht good, sfe, nd clen combustion prctices cn be demonstrted. Severl developers hve designed monitoring units tht they clim will mesure vrious regulted hzrdous compounds using number of different innovtive concepts nd technologies. The development of these CEM pproches for both trce metl nd trce orgnic nlyte clsses hs dvnced to the stte tht severl cndidte pproches re now in the prototype instrument stge. Given this, the generl objective of the project reported herein ws to test severl prototype instruments nd estblish or estimte for ech unit the effectiveness, relibility, ccurcy, nd detection limit. For this test progrm, ten developing CEM pproches were tested. These re listed in Tble 1 by monitored nlyte clss. As shown, included in the list of CEMs tested in this progrm re one semivoltile orgnic constituent (SVOC), four VOC, two multi-metl, nd three mercury CEMs. Tble 1. Prticipnts in the CEM Test Progrm Test Progrm The selected pproches evluted in this test progrm were performed in the pilot-scle rotry kiln incinertion system (RKS) t EPA s IRF, locted in Jefferson, AR. The testing consisted of obtining quntittive mesurement dt on four mesures of CEM performnce checked in reltive ccurcy test udit of CEM s described in 40 CFR 60 Appendix F. These mesures re RA, CD, ZD, nd response time. Mesuring CEM s RA requires compring the monitored nlyte concentrtion reported by the CEM to the concentrtion determined by the RM for the nlyte. In this progrm, the RM for trce metl (including mercury) monitors ws drft Method 29, the EPA multiple metls method documented in the boiler nd industril furnce rules. The RM for VOCs ws Method 0030 with nlysis using therml desorption, purge nd trp by Method 5040, nd quntittion by Method 8015A. The RM for SVOCs ws Method 0010 with nlysis by Method 8270B. Test Fcility Figure 1 is process schemtic of the RKS s configured for these tests. The RKS consists of primry combustion chmber, trnsition section, nd fired fterburner chmber. After exiting the fterburner extension, flue gs flows through quench section tht is followed by Monitored Anlyte Developer Approch SVOCs EcoChem Photoioniztion of erosol-bound polycyclic romtic hydrocrbons VOCs EcoLogic Continuous chemicl ioniztion mss spectrometry Mrine Shle Processors (MSP) Continuous online mss spectrometry Ok Ridge Ntionl Lbortory (ORNL) Direct smpling ion trp mss spectrometry EPA, Air Pollution Prevention nd Online gs chromtogrphy with dul flme Control Division (APPCD) ioniztion, electron cpture detection Multi-metls Sndi Ntionl Lbortories (SNL) Lser induced plsm spectroscopy Metorex Extrctive bet guge prticulte monitor with x-ry fluorescence metls nlysis Mercury Perkin-Elmer Gold trp mlgmtion collection, cold vpor tomic bsorption spectroscopy nlysis Senov Noble metl film solid stte chemicl microsensor EcoChem Cold vpor tomic bsorption spectroscopy primry ir pollution control system (APCS). The initil element of the primry APCS for these tests ws the venturi scrubber/pcked-column scrubber combintion shown in Figure 1. This scrubber system removes from the flue gs most of the corse prticles nd ny cid gs, such s HCl. Following the scrubber system, the flue gs is reheted to bout 120 C (250 F) by 100-kW electric duct heter, then pssed through fbric filter (bghouse). The bghouse removes most of the remining flue gs prticles. Downstrem of the bghouse, bckup, secondry APCS, comprised of n ctivted-crbon dsorber nd high-efficiency prticulte ir filter is in plce. The CEMs tested in this progrm smpled flue gs t the scrubber exit loction. Testing Procedures The test progrm consisted of four series of tests; ech series tested one set of CEMs, generlly monitoring the sme nlyte set. Up to three CEMs were tested t the sme time during ech of the four test series. The mjor portion of the test progrm consisted of performing three sequentil RM mesurements, while the tested CEMs were in opertion, t ech of three flue gs concentrtions of monitored nlytes. Thus, ech test series ws designed to supply nine sets of prllel RM nd CEM reding dt, three t ech of three nlyte concentrtions. These nine sets of prllel RM nd CEM dt supported the clcultion of ech CEM s RA. Thus, up to three RAs were clculted for ech CEM, one t ech of the three flue gs concentrtions tested. Other test efforts supported the mesurements of CD, ZD, nd response time. Test Wste Feed The incinertor feed mteril ws synthetic hzrdous wste comprised of n ttpulgite cly solid sorbent combined with mixture of 14 trce metls nd VOCs. The mixture of VOCs dded to the sorbent bse contined 76% toluene by weight, with 12% ech of chlorobenzene nd tetrchloroethene. This mixture ws combined with the cly sorbent in the rtio of 1.0 kg of orgnic constituent mixture to 2.4 kg of cly. The mixture ws freeflowing solid with no freestnding liquid nd ws continuously fed to the RKS vi screw feeder system. For ll tests, the trget cly/orgnic mixture feedrte ws 68 kg/hr (150 lb/hr). The trget kiln exit gs temperture ws 870 C (1,600 F), nd the trget fterburner exit gs temperture ws 1,065 C (1,950 F). 2

3 ID fn Quench Secondry burner Air Nturl gs, liquid Afterburner feed Afterburner extension Solids feeder Venturi scrubber Scrubber liquor recircultion Pcked column Column scrubber Scrubber Crbon bed dsorber HEPA filter Atmosphere ID fn Stck Trnsfer duct Ash bin Rotry kiln Min burner Air Nturl gs liquid feed Flue gs reheter Ash hopper Bghouse Rotry Kiln Incinertor Primry Air Pollution Control System Redundnt Air Pollution Control System Figure 1. Schemtic of the IRF rotry kiln incinertion system. Multi-Metl nd Mercury CEM Tests The trce metls of interest to the test progrm re listed in Tble 2, which lso notes the progrm trget scrubber exit flue gs concentrtions of ech metl for the tests of multi-metls CEMs. For the mercury CEMs tests in Test Series 3, the low concentrtion trgets were t hlf the levels noted in the low concentrtion column in Tble 2. The intermedite concentrtion trgets were those noted in the low concentrtion column in Tble 2. The high concentrtion trgets were those noted in the intermedite concentrtion column in Tble 2. This chnge ws incorported t the request of the mercury CEM developers. Trce metls were dded to the RKS, to result in scrubber exit flue gs levels, vi two routes. Both routes used n queous spike solution of the metls. A concentrted solution ws dded for the multi-metl CEM test dys t the high trget flue gs metls concentrtion. This concentrted solution ws diluted for the multi-metl CEM test dys t the intermedite nd low trget concentrtions nd for the mercury CEM tests. The two routes of metls ddition were incorported into the cly/orgnic mixture nd tomized into the kiln min burner flme. VOC nd SVOC CEM Tests The VOCs present in the scrubber exit flue gs for ll tests included benzene, crbon tetrchloride, chlorobenzene, chloroform, 1,2-dichloroethne, 1,1-dichloroethene, tetrchloroethene, toluene, 1,1,1-trichloroethne, nd trichloroethene. The trget flue gs concentrtions of the compounds were in the 2, 20, nd 200 µg/dscm rnges (low, intermedite, nd high concentrtions). Nphthlene, phennthrene, nd pyrene were the SVOCs introduced into the flue gs for ll tests, t the sme trget flue gs concentrtions noted bove. The VOCs nd SVOCs were introduced into the flue gs by metering solution of the spiking compounds in methnol through length of fine bore stinless steel tubing into the fterburner extension t its centerline. The fterburner exit flue gs ws prtilly quenched to temperture of between 360 to 427 C (680 nd 800 F) by wter spry introduced t the Tble 2. Test Trce Metls nd Trget Flue Gs Concentrtions Trget Flue Gs Concentrtion, µg/dscm Metl Low Intermedite High Antimony (Sb) Arsenic (As) Brium (B) ,000 Beryllium (Be) Cdmium (Cd) Chromium (Cr) Coblt (Co) Led (Pb) ,000 Mngnese (Mn) Mercury (Hg) Nickel (Ni) Selenium (Se) ,000 Silver (Ag) Thllium (Tl)

4 beginning of the fterburner extension. A concentrted orgnic spiking solution ws prepred nd used for the high trget flue gs VOC nd SVOC CEM tests. The concentrted solution ws diluted ppropritely for the intermedite nd low trget flue gs concentrtion tests. Test Results VOC CEM Tests Tbles 3 through 5 present the results of the three sequentil RM mesurements, long with the Ok Ridge Ntionl Lbo- rtory (ORNL) nd EcoLogic CEM results, for ech of the three VOC concentrtions tested in Test Series 1. The EcoLogic CEM dt for the first dy of testing t the low VOC concentrtion were not reported in EcoLogic s test report becuse of opertor error tht resulted in CEM redings tht were inflted nd incorrect. RAs clculted using the RM nd CEM dt in Tbles 3 through 5 re summrized in Tble 6. The dt in Tble 6 show tht the clculted RAs for the ORNL CEM rnged from 123% to 305% t the low test concentrtion, with n verge of 196% over the seven compounds reported. ORNL CEM RAs were improved t the intermedite test concentrtion, t 113% to 278%, with n verge of 154% over the nine compounds reported. Further improvement is seen t the high test concentrtion, with n RA rnge of 84% to 144%, nd n verge of 105% over ll ten compounds reported. In fct, the RA for ll VOCs reported uniformly improved s the test concentrtion incresed. Tble 3. Mesured Flue Gs Concentrtions for the Test of the ORNL nd EcoLogic CEMs t the Low VOC Concentrtion Concentrtion, µg/dscm 1st Dily RM 2nd Dily RM 3rd Dily RM Eco- Eco- Eco- Compound RM ORNL Logic RM ORNL Logic RM ORNL Logic Benzene NO NO NO Crbon 31.2 <0.4 NO 34.2 <0.4 NO NO tetrchloride Chlorobenzene NO NO NO Chloroform NO NO NO 1,2-Dichloroethne NO NO NO 1,1-Dichloroethene NO 35.6 <0.4 NO NO Tetrchloroethene NO NO NO Toluene NO NO NO 1,1,1-2.5 <0.4 NO 4.6 <0.4 NO 6.4 <0.4 NO Trichloroethne Trichloroethene 6.9 <0.4 NO 5.9 <0.4 NO 3.9 <0.4 NO NO=CEM not opertionl. Tble 4. Mesured Flue Gs Concentrtions for the Test of the ORNL nd EcoLogic CEMs t the Intermedite VOC Concentrtion Concentrtion, µg/dscm 1st Dily RM 2nd Dily RM 3rd Dily RM Eco- Eco- Eco- Compound RM ORNL Logic RM ORNL Logic RM ORNL Logic Benzene < Crbon tetrchloride Chlorobenzene Chloroform ,2-Dichloroethne ,1-Dichloroethene Tetrchloroethene Toluene ,1, < < < Trichloroethne Trichloroethene

5 Tble 5. Mesured Flue Gs Concentrtions for the Test of the ORNL nd EcoLogic CEMs t the High VOC Concentrtion Concentrtion, µg/dscm 1st Dily RM 2nd Dily RM 3rd Dily RM Eco- Eco- Eco- Compound RM ORNL Logic RM ORNL Logic RM ORNL Logic Benzene Crbon tetrchloride Chlorobenzene Chloroform ,2-Dichloroethne ,1-Dichloroethene Tetrchloroethene Toluene 1, ,300 1, ,200 1, ,1, Trichloroethne Trichloroethene Tble 6. Reltive Accurcies of the ORNL nd EcoLogic CEMs RA,% ORNL EcoLogic Test Concentrtion Test Concentrtion Compound Low Intermedite High Low Intermedite High Benzene NC 5, Crbon tetrchloride NC NC Chlorobenzene NC Chloroform NC ,2-Dichloroethne NC 2, ,1-Dichloroethene NC 2, Tetrchloroethene NC 1, Toluene NC ,1,1-Trichloroethne NC NC 110 NC 7, Trichloroethene NC NC 5, Averge b NC 2, Medin b , NC 1,640, 52, 103 2, NC=Not clculted. b Averge nd medin excludes NC entries. For the intermedite test concentrtion, the RAs of the EcoLogic CEM rnged from 65% to 7,320%, with n verge of 2,520%. Improved performnce ws seen t the high test concentrtion, for which the RA rnged from 27% to 283% nd verged 121%. As seen for the ORNL CEM, the RAs for nine of the ten VOCs reported were improved t the high test concentrtion compred to the intermedite concentrtion. Tbles 7 through 9 present the results of the three sequentil RM mesurements, long with the EPA/APPCD nd MSP CEM results, for ech of the three VOC concentrtions tested in Test Series 4. The tbles indicte tht, out of the nine smpling periods, MSP obtined dt for only two periods. RAs corresponding to the RM/CEM concentrtion dt given in Tbles 7 through 9 re summrized in Tble 10. The dt in Tble 10 show tht the RAs for the EPA CEM rnged from 71% to 3,190% nd verged 638% for the low test concentrtions. The reltively high verge RA ws driven by the two very high RAs for 1,2-dichloroethne nd 1,1-dichloroethene. These two compounds were found in EPA/APPCD system blnks. EPA/ APPCD s decision not to blnk-correct their dt led to the corresponding high RAs. The medin RA for the low concentrtion test t much improved 113% 5

6 Tble 7. Mesured Flue Gs Concentrtions for the Test of the EPA/APPCD nd MSP CEMs t the Low VOC Concentrtion Concentrtion, µg/dscm 1st Dily RM 2nd Dily RM 3rd Dily RM EPA/ EPA/ EPA/ Compound RM APPCD MSP RM APPCD MSP RM APPCD MSP Benzene NO Crbon NO tetrchloride Chlorobenzene NO Chloroform NO , ,515 1,2-Dichloroethne NO ,1-Dichloroethene NO Tetrchloroethene NO Toluene NO , ,1, NO Trichloroethne Trichloroethene NO , ,602 NO=Not opertionl. Tble 8. Mesured Flue Gs Concentrtions for the Test of the EPA/APPCD nd MSP CEMs t the Intermedite VOC Concentrtion Concentrtion, µg/dscm 1st Dily RM 2nd Dily RM 3rd Dily RM EPA/ EPA/ EPA/ Compound RM APPCD MSP RM APPCD MSP RM APPCD MSP Benzene NO NO NO Crbon NO NO NO tetrchloride Chlorobenzene NO NO NO Chloroform NO NO NO 1,2-Dichloroethne NO NO NO 1,1-Dichloroethene NO NO NO Tetrchloroethene NO NO NO Toluene NO NO NO 1,1, NO NO NO Trichloroethne Trichloroethene NO NO NO NO=Not opertionl. to 137%, removes the dominnt influence of the two compounds for which the CEM did poorly. The RAs for the EPA CEM were improved t the intermedite test concentrtion, rnging from 29% to 1,130% nd verging 213%. Poor performnce in quntitting 1,2-dichloroethne nd 1,1- dichloroethene gin ccounts lrgely for the high verge RA. Agin, the medin RA t 83% to 98% better reflects the men performnce of the CEM by removing the dominnt influence of the RAs for the two VOCs poorly quntitted. Further improved performnce of the EPA CEM ws seen t the high test concentrtion, with n RA rnge from 34% to 133% nd n verge RA of 73%. In fct, t the high test concentrtion, the RAs for two compounds poorly quntitted t the low nd intermedite test concentrtions re more in line with those clculted for the other 6

7 Tble 9. Mesured Flue Gs Concentrtions for the Test of the EPA/APPCD nd MSP CEMs t the High VOC Concentrtion Concentrtion, µg/dscm 1st Dily RM 2nd Dily RM 3rd Dily RM EPA/ EPA/ EPA/ Compound RM APPCD MSP RM APPCD MSP RM APPCD MSP Benzene NO NO NO Crbon NO NO NO tetrchloride Chlorobenzene NO NO NO Chloroform NO NO NO 1,2-Dichloroethne NO NO NO 1,1-Dichloroethene NO NO NO Tetrchloroethene NO NO NO Toluene NO NO NO 1,1, NO NO NO Trichloroethne Trichloroethene NO NO NO NO=Not opertionl. Tble 10. Reltive Accurcies of the EPA/APPCD nd MSP CEMs RA,% EPA/APPCD MSP Test Concentrtion Test Concentrtion Compound Low Intermedite High Low Benzene ,300 Crbon tetrchloride ,200 Chlorobenzene ,150 Chloroform ,800 1,2-Dichloroethne 3, ,740 1,1-Dichloroethene 2,040 1, ,700 Tetrchloroethene Toluene ,040 1,1,1-Trichloroethne Trichloroethene ,000 Averge ,400 Medin 113, , 98 53,70 3,150, 6,740 eight compounds. For this reson, the medin RA t 53% to 70% is comprble to the verge RA. The clculted RAs bsed on the two vilble CEM/RM mesurement pirs for the MSP CEM were quite lrge, rnging from 315% to 412,000% nd verging 54,600%. Even the medin RAs for the MSP CEM, t 2,840% to 6,480%, re quite high. SVOC CEM Tests The SVOC CEM tests were performed t the sme time s the second set of VOC CEM tests. Tble 11 presents the results of the three sequentil RM mesurements performed ech test dy, nd compres these to the EcoChem CEM results for the test dys t the low nd intermedite SVOC concentrtions. Due to problems in the flue gs conditioning (moisture removl) system, the EcoChem CEM could not be brought into opertion on the lst dy of testing t the high SVOC concentrtion. In ddition, no CEM dt were obtined during the first RM period on the intermedite concentrtion test dy becuse the EcoChem CEM ws not in opertion, gin due to problems with the flue gs moisture removl system. Tble 11 lso notes the RA of the EcoChem PAH CEM for the two test dys the CEM ws in opertion. The tble indictes tht the RAs for the 7

8 Tble 11. Mesured Flue Gs Concentrtions for the Tests of the EcoChem PAH CEMs Concentrtion, µg/dscm Test 1st Dily RM 2nd Dily RM 3rd Dily RM RA,% Low Concentrtion Test Nphthlene Phennthrene Pyrene Totl PAH EcoChem CEM Intermedite Concentrtion Test Nphthlene Phennthrene Pyrene Totl PAH EcoChem CEM NO High Concentrtion Test Nphthlene 97.0 NP b NP Phennthrene 91.4 NP NP Pyrene 68.2 NP NP Totl PAH NP NP EcoChem CEM NO NO NO NC c NO=Not opertionl. b NP=Not performed. c NC=Not clculted. Tble 12. Mesured Flue Gs Concentrtions for the Test of the SNL nd Metorex CEMs t the Low Metls Concentrtions Concentrtion, µg/dscm 1st Dily RM 2nd Dily RM 3rd Dily RM Metl RM SNL Metorex RM SNL Metorex RM SNL Metorex Antimony (Sb) 4.5 ND ND 5.1 ND ND 4.5 ND 5.13 Arsenic (As) 4.4 ND ND ND 1.19 Brium (B) 11.7 ND ND 15.8 ND ND 18.6 ND 6.23 Cdmium (Cd) 9.7 ND ND ND 13.2 ND Chromium (Cr) 22.3 ND ND ND Coblt (Co) 7.8 ND ND ND 7.1 ND Led (Pb) 101 ND ND ND Mngnese (Mn) 21.8 ND ND ND 31.6 ND Nickel (Ni) 39.6 ND ND ND Selenium (Se) 11.4 ND ND ND 3.62 Thllium (Tl) 1.1 ND ND 1.5 ND ND 1.7 ND ND ND=Not detected. EcoChem CEM were 527% nd 99%. As ws seen in the VOC CEM tests, the RA t the higher test flue gs concentrtion ws improved in comprison to the lower test concentrtion. Multi-Metl CEM Tests Tbles 12 through 14 summrize the results of the three sequentil RM mesurements performed ech test dy nd compres these to the Sndi Ntionl Lbortories (SNL) nd Metorex CEM mesurements. Neither CEM mesured beryllium or mercury, so these metls re not included in the three tbles. In ddition, results for silver re not included in the tbles. Spike recovery from QA smples ws poor, so silver concentr- 8

9 Tble 13. Mesured Flue Gs Concentrtions for the Test of the SNL nd Metorex CEMs t the Intermedite Metls Concentrtions Concentrtion, µg/dscm Reference Method 1 Reference Method 2 Reference Method 3 Metl RM SNL Metorex RM SNL Metorex RM SNL Metorex Antimony (Sb) 11.0 ND ND ND 8.49 Arsenic (As) Brium (B) Cdmium (Cd) 14.0 ND ND ND Chromium (Cr) 54.7 ND ND ND Coblt (Co) 32.3 ND ND ND 9.79 Led (Pb) Mngnese (Mn) 24.2 ND ND ND Nickel (Ni) 59.9 ND ND ND Selenium (Se) 43.2 ND ND ND Thllium (Tl) 11.1 ND ND ND 2.72 ND=Not detected. Tble 14. Mesured Flue Gs Concentrtions for the Test of the SNL nd Metorex CEMs t the High Metls Concentrtions Concentrtion, µg/dscm Reference Method 1 Reference Method 2 Reference Method 3 Metl RM SNL Metorex RM SNL Metorex RM SNL Metorex Antimony (Sb) Arsenic (As) Brium (B) ND ND Cdmium (Cd) 88.0 ND ND ND Chromium (Cr) 425 ND ND ND Coblt (Co) 357 ND ND ND Led (Pb) 1,650 ND ,082 ND , Mngnese (Mn) 179 ND ND ND Nickel (Ni) 550 ND ND ND Selenium (Se) 421 ND ND ND Thllium (Tl) 114 ND ND ND ND=Not detected. tions s mesured by the RM re highly suspect. The SNL CEM did not detect ny of the test trce metls on the low concentrtion test dy, only rsenic, brium, nd led were reported on the intermedite concentrtion test dy, nd only ntimony, rsenic, brium, nd led for one or more RM periods were reported on the high concentrtion test dy. The RAs corresponding to the mesurement pir dt in Tbles 12 through 14 re summrized in Tble 15. The dt in Tble 15 show tht the RAs for the SNL CEM rnged from 64% to 1,560% for the three metls reported on the intermedite concentrtion test dy, nd from 65% to 188% for the two metls reported on the high concentrtion test dy. RAs for the Metorex CEM rnged from 88% to 236%, with n verge of 129% nd medin of 116% for the low concentrtion test. Corresponding RAs for the intermedite concentrtion test were 72% to 467%, with n verge of 168% nd medin of 135%, nd, for the high concentrtion test, 93% to 177%, with n verge of 129% nd medin of 121%. The RAs for the Metorex CEM were comprble for ech test concentrtion. No mrked improvement s flue gs concentrtion incresed, s observed for the VOC CEMs, is seen in the Metorex CEM dt. 9

10 Tble 15. Reltive Accurcies of the SNL nd Metorex CEMs RA,% SNL Metorex Test Concentrtion Test Concentrtion Metl Low Intermedite High Low Intermedite High Antimony (Sb) NC NC 188 NC Arsenic (As) NC 1, Brium (B) NC 905 NC NC Cdmium (Cd) NC NC NC Chromium (Cr) NC NC NC Coblt (Co) NC NC NC Led (Pb) NC 64 NC Mngnese (Mn) NC NC NC Nickel (Ni) NC NC NC Selenium (Se) NC NC NC Thllium (Tl) NC NC NC NC Averge b Medin b , NC=Not clculted. b Averge nd medin exclude RAs NC. Mercury CEM Tests Tble 16 summrizes the results of three sequentil RM mesurements performed ech mercury CEM test dy nd compres these to the corresponding three mercury CEM mesurements. Clculted RAs for ech CEM re lso given in the tble for the three test dys, ech representing different flue gs mercury concentrtion. The tble indictes severl periods during which the Perkin-Elmer nd the Senov CEMs were not in opertion. The dt in Tble 16 show tht the EcoChem CEM hd n RA of bout 60% for both the low nd the high concentrtion tests. The RA t the intermedite concentrtion ws incresed, t 92%. The RA of the Perkin-Elmer CEM ws 602% t the low mercury concentrtion nd 1,150% (bsed on two mesurement pirs) t the intermedite mercury concentrtion. The RA of the Senov CEM ws 186% t the one test concentrtion hving dt. The full report ws submitted in fulfillment of Contrct No. 68-C4-0044, Work Assignments 0-4 nd 1-1, by Acurex Environmentl Corportion under the sponsorship of the U.S. Environmentl Protection Agency. Tble 16. Mesured Flue Gs Concentrtions nd RAs for the Mercury CEM Tests Mercury Concentrtion, µg/dscm EcoChem Perkin-Elmer Senov Test RM CEM CEM CEM Low Mercury Concentrtion RM NO RM NO RM NO RA,% NC b Intermedite Mercury Concentrtion RM NO RM NO NO RM NO RA,% 92 1,150 NC High Mercury Concentrtion RM NO 232 RM NO 116 RM RA,% 61 NC 186 NO=Not opertionl. b NC=Not clculted. 10

11 S. B. Ghorishi, W. E. Whitworth, Jr., C. G. Goldmn, nd L. R. Wterlnd re with Acurex Environmentl Corportion, Jefferson, AR R. C. Thurnu is the EPA Project Officer, nd M. K. Richrds is the Work Assignment Mnger (see below). The complete report, entitled Testing the Performnce of Rel-Time Incinertor Emission Monitors, (Order No. PB ; Cost: $38.00, subject to chnge) will be vilble only from Ntionl Technicl Informtion Service 5285 Port Royl Rod Springfield, VA Telephone: The EPA Project Officer nd Work Assignment Mnger cn be contcted t Ntionl Risk Mngement Reserch Lbortory U.S. Environmentl Protection Agency Cincinnti, OH United Sttes Environmentl Protection Agency Center for Environmentl Reserch Informtion Cincinnti, OH BULK RATE POSTAGE & FEES PAID EPA PERMIT No. G-35 Officil Business Penlty for Privte Use $300 EPA/600/SR-97/024 11