EPA Method 8081B Organochlorine Pesticides by Gas Chromatography - Revision 2
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ID： |
D307829AA07440258667370AF472B59D |
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文件大小(MB)： |
0.12 |
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页数： |
57 |
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文件格式： |
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日期： |
2009-12-31 |
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购买： |
文本摘录（文本识别可能有误，但文件阅览显示及打印正常，pdf文件可进行文字搜索定位）：
8081B - 1 Revision 2,November 2000,METHOD 8081B,ORGANOCHLORINE PESTICIDES BY GAS CHROMATOGRAPHY,1.0 SCOPE AND APPLICATION,1.1 Method 8081 may be used to determine the concentrations of various organochlorine,pesticides in extracts from solid and liquid matrices, using fused-silica, open-tubular, capillary,columns with electron capture detectors (ECD) or electrolytic conductivity detectors (ELCD). The,compounds listed below may be determined by either a single- or dual-column analysis system.,Compound CAS Registry No.,Aldrin 309-00-2,"-BHC 319-84-6,$-BHC 319-85-7,(-BHC (Lindane) 58-89-9,*-BHC 319-86-8,"-Chlordane 5103-71-9,(-Chlordane 5103-74-2,Chlordane - not otherwise specified (n.o.s.) 57-74-9,Chlorobenzilate 510-15-6,1,2-Dibromo-3-chloropropane (DBCP) 96-12-8,4,4'-DDD 72-54-8,4,4'-DDE 72-55-9,4,4'-DDT 50-29-3,Diallate 2303-16-4,Dieldrin 60-57-1,Endosulfan I 959-98-8,Endosulfan II 33213-65-9,Endosulfan sulfate 1031-07-8,Endrin 72-20-8,Endrin aldehyde 7421-93-4,Endrin ketone 53494-70-5,Heptachlor 76-44-8,Heptachlor epoxide 1024-57-3,Hexachlorobenzene 118-74-1,Hexachlorocyclopentadiene 77-47-4,Isodrin 465-73-6,Methoxychlor 72-43-5,Toxaphene 8001-35-2,8081B - 2 Revision 2,November 2000,1.2 Method 8081 no longer includes PCBs as Aroclors in the list of target analytes. The,analysis of PCBs should be undertaken using Method 8082, which includes specific cleanup and,quantitation procedures designed for PCB analysis. This change was made to obtain PCB data of,better quality and to eliminate the complications inherent in a combined organochlorine pesticide and,PCB method. Therefore, if the presence of PCBs is suspected, use Method 8082 for PCB,analyses, and this method (Method 8081) for the organochlorine pesticides. If there is no,information on the likely presence of PCBs, either employ a PCB-specific screening procedure such,as an immunoassay (e.g., Method 4020), or split the sample extract prior to any cleanup steps, and,process part of the extract for organochlorine pesticide analysis and the other portion for PCB,analysis using Method 8082.,1.3 The analyst must select columns, detectors and calibration procedures most,appropriate for the specific analytes of interest in a study. Matrix-specific performance data must,be established and the stability of the analytical system and instrument calibration must be,established for each analytical matrix (e.g., hexane solutions from sample extractions, diluted oil,samples, etc.).,1.4 Although performance data are presented for many of the target analytes, it is unlikely,that all of them could be determined in a single analysis. The chemical and chromatographic,behaviors of many of these chemicals can result in coelution of some target analytes. Several,cleanup/fractionation schemes are provided in this method and in Method 3600.,1.5 Several multi-component mixtures (i.e., chlordane and toxaphene) are listed as target,analytes. When samples contain more than one multi-component analyte, a higher level of analyst,expertise is required to attain acceptable levels of qualitative and quantitative analysis. The same,is true of multi-component analytes that have been subjected to environmental degradation or,degradation by treatment technologies. These result in "weathered" multi-component mixtures that,may have significant differences in peak patterns than those of standards.,1.6 Compound identification based on single-column analysis should be confirmed on a,second column, or should be supported by at least one other qualitative technique. This method,describes analytical conditions for a second gas chromatographic column that can be used to,confirm the measurements made with the primary column. GC/MS Method 8270 is also,recommended as a confirmation technique, if sensitivity permits (see Sec. 7.7). GC/AED may also,be used as a confirmation technique, if sensitivity permits (See Method 8085).,1.7 This method includes a dual-column option that describes a hardware configuration,in which two GC columns are connected to a single injection port and to two separate detectors.,The option allows one injection to be used for dual-column simultaneous analysis.,1.8 Prior to employing this method, analysts are advised to consult the base method for,each type of procedure that may be employed in the overall analysis (e.g., Methods 3500, 3600,5000, and 8000) for additional information on quality control procedures, development of QC,acceptance criteria, calculations, and general guidance. Analysts also should consult the disclaimer,statement at the front of the manual and the information in Chapter Two, Sec. 2.1, for guidance on,the intended flexibil……
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