EPA Method 8111 Haloethers by Gas Chromatography - Revision 0
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ID： |
566F6F14F23740878D15E6C4A5F97FF9 |
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文件大小(MB)： |
0.07 |
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页数： |
13 |
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日期： |
2003-1-16 |
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CD-ROM 8111 - 1 Revision 0,December 1996,METHOD 8111,HALOETHERS BY GAS CHROMATOGRAPHY,1.0 SCOPE AND APPLICATION,1.1 Method 8111 is a gas chromatographic (GC) method used to determine the concentration,of haloethers. It describes wide-bore open-tubular, capillary column gas chromatography procedures,using the a dual-column/dual-detector approach, however, a single column/single detector approach,is acceptable. The following RCRA analytes can be determined by this method:,Compound CAS No.a,Bis(2-chloroethoxy)methane 111-91-1,Bis(2-chloroethyl) ether 111-44-4,Bis(2-chloroisopropyl) ether 108-60-1,4-Chlorophenyl phenyl ether 7005-72-3,aChemical Abstract Service Registry Number,1.2 The following non-RCRA analytes may also be analyzed by this method:,Compound CAS No.,4-Bromophenyl phenyl ether 101-55-3,2-Chlorophenyl 4-nitrophenyl ether 209-61-4,3-Chlorophenyl 4-nitrophenyl ether 2303-23-3,4-Chlorophenyl 4-nitrophenyl ether 1836-74-4,2,4-Dibromophenyl 4-nitrophenyl ether 2671-93-4,2,4-Dichlorophenyl 3-methyl-4-nitrophenyl ether 42488-57-3,2,6-Dichlorophenyl 4-nitrophenyl ether 2093-28-9,3,5-Dichlorophenyl 4-nitrophenyl ether NA,2,5-Dichlorophenyl 4-nitrophenyl ether 391-48-7,2,4-Dichlorophenyl 4-nitrophenyl ether 1836-75-5,2,3-Dichlorophenyl 4-nitrophenyl ether 82239-20-1,3,4-Dichlorophenyl 4-nitrophenyl ether 22532-80-5,4-Nitrophenyl phenyl ether 620-88-2,2,4,6-Trichlorophenyl 4-nitrophenyl ether 1836-77-7,2,3,6-Trichlorophenyl 4-nitrophenyl ether NA,2,3,5-Trichlorophenyl 4-nitrophenyl ether NA,2,4,5-Trichlorophenyl 4-nitrophenyl ether 22532-68-9,3,4,5-Trichlorophenyl 4-nitrophenyl ether NA,2,3,4-Trichlorophenyl 4-nitrophenyl ether NA,NA = CAS numbers not assigned at this time.,CD-ROM 8111 - 2 Revision 0,December 1996,1.3 This method is restricted to use by or under the supervision of analysts experienced in,the use of a gas chromatograph and in the interpretation of gas chromatograms.,2.0 SUMMARY OF METHOD,2.1 Method 8111 provides gas chromatographic conditions for the detection of ppb,concentrations of haloethers in water and soil or ppm concentrations in waste samples.,2.2 Prior to use of this method, appropriate sample extraction techniques must be used for,environmental samples (refer to Chap. Two and Method 3500).,2.3 Both neat and diluted organic liquids (Method 3580) may be analyzed by direct injection.,2.4 Analysis is accomplished by gas chromatography utilizing an instrument equipped with,a wide-bore capillary column and an electron capture detector.,3.0 INTERFERENCES,3.1 Refer to Methods 3500, 3600, and 8000.,3.2 The electron capture detector responds to all electronegative compounds. Therefore,interferences are possible by other halogenated compounds, as well as phthalates and other,oxygenated compounds such as organonitrogen, organosulfur, and organophosphorus compounds.,Second column confirmation or GC/MS confirmation are necessary to ensure proper analyte,identification unless previous characterization of the sample source will ensure proper identification.,3.3 Dichlorobenzenes are known to coelute with haloethers under some gas chromatographic,conditions. If these materials are present in a sample, it may be necessary to analyze the extract,with two different column packings to completely resolve all of the compounds.,3.4 Contamination by carryover can occur whenever high-concentration and,low-concentration samples are sequentially analyzed. To reduce carryover, the syringe used for,injection must be thoroughly rinsed between samples with solvent. Whenever a highly concentrated,sample is encountered, it should be followed by the analysis of a solvent blank to check for,cross-contamination. Additional solvent blanks interspersed with the sample extracts should be,considered whenever the analysis of a solvent blank indicates cross-contamination problems.,3.5 Some compounds coelute using this procedure. In these cases, the compounds must,be reported as coeluting. The mixture may be reanalyzed for peak confirmation by GC/MS,techniques if concentration permits (see Method 8270).,3.6 Solvents, reagents, glassware, and other sample processing hardware may yield discrete,artifacts and/or elevated baselines causing misinterpretation of gas chromatograms. All these,materials must be demonstrated to be free from interferences under the conditions of the analysis,by analyzing reagent blanks.,4.0 APPARATUS AND MATERIALS,4.1 Gas chromatograph - An analytical system complete with a gas chromatograph suitable,for on-column and split/splitless injection, and all necessary accessories, including syringes,CD-ROM 8111 - 3 Revision 0,December 1996,analytical columns, gases and two el……
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