EPA Method 8082 Polychlorinated Biphenyls (PCBs) by Gas Chromatography - Revision 0
|
ID： |
CBBA95E37B1C439BA3380054D7783CFD |
|
文件大小(MB)： |
0.2 |
|
页数： |
41 |
|
文件格式： |
|
|
日期： |
2003-1-16 |
|
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）：
CD-ROM 8082 - 1 Revision 0,December 1996,METHOD 8082,POLYCHLORINATED BIPHENYLS (PCBs),BY GAS CHROMATOGRAPHY,1.0 SCOPE AND APPLICATION,1.1 Method 8082 is used to determine the concentrations of polychlorinated biphenyls (PCBs),as Aroclors or as individual PCB congeners in extracts from solid and aqueous matrices. Opentubular,capillary columns are employed with electron capture detectors (ECD) or electrolytic,conductivity detectors (ELCD). When compared to packed columns, these fused-silica, open-tubular,columns offer improved resolution, better selectivity, increased sensitivity, and faster analysis. The,target compounds listed below may be determined by either a single- or dual-column analysis,system. The PCB congeners listed below have been tested by this method, and the method may,be appropriate for additional congeners.,Compound CAS Registry No. IUPAC #,Aroclor 1016 12674-11-2 -,Aroclor 1221 11104-28-2 -,Aroclor 1232 11141-16-5 -,Aroclor 1242 53469-21-9 -,Aroclor 1248 12672-29-6 -,Aroclor 1254 11097-69-1 -,Aroclor 1260 11096-82-5 -,2-Chlorobiphenyl 2051-60-7 1,2,3-Dichlorobiphenyl 16605-91-7 5,2,2',5-Trichlorobiphenyl 37680-65-2 18,2,4',5-Trichlorobiphenyl 16606-02-3 31,2,2',3,5'-Tetrachlorobiphenyl 41464-39-5 44,2,2',5,5'-Tetrachlorobiphenyl 35693-99-3 52,2,3',4,4'-Tetrachlorobiphenyl 32598-10-0 66,2,2',3,4,5'-Pentachlorobiphenyl 38380-02-8 87,2,2',4,5,5'-Pentachlorobiphenyl 37680-73-2 101,2,3,3',4',6-Pentachlorobiphenyl 38380-03-9 110,2,2',3,4,4',5'-Hexachlorobiphenyl 35065-28-2 138,2,2',3,4,5,5'-Hexachlorobiphenyl 52712-04-6 141,2,2',3,5,5',6-Hexachlorobiphenyl 52663-63-5 151,2,2',4,4',5,5'-Hexachlorobiphenyl 35065-27-1 153,2,2',3,3',4,4',5-Heptachlorobiphenyl 35065-30-6 170,2,2',3,4,4',5,5'-Heptachlorobiphenyl 35065-29-3 180,2,2',3,4,4',5',6-Heptachlorobiphenyl 52663-69-1 183,2,2',3,4',5,5',6-Heptachlorobiphenyl 52663-68-0 187,2,2',3,3',4,4',5,5',6-Nonachlorobiphenyl 40186-72-9 206,CD-ROM 8082 - 2 Revision 0,December 1996,1.2 Aroclors are multi-component mixtures. When samples contain more than one Aroclor,a higher level of analyst expertise is required to attain acceptable levels of qualitative and,quantitative analysis. The same is true of Aroclors that have been subjected to environmental,degradation ("weathering") or degradation by treatment technologies. Such weathered multicomponent,mixtures may have significant differences in peak patterns than those of Aroclor,standards.,1.3 Quantitation of PCBs as Aroclors is appropriate for many regulatory compliance,determinations, but is particularly difficult when the Aroclors have been weathered by long exposure,in the environment. Therefore, this method provides procedures for the determination of selected,individual PCB congeners. The 19 PCB congeners listed above have been tested by this method.,1.4 The PCB congener approach potentially affords greater quantitative accuracy when PCBs,are known to be present. As a result, this method may be used to determine Aroclors, some PCB,congeners, or "total PCBs," depending on regulatory requirements and project needs. The congener,method is of particular value in determining weathered Aroclors. However, analysts should use,caution when using the congener method when regulatory requirements are based on Aroclor,concentrations.,1.5 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 when sensitivity permits (Sec. 8.0).,1.6 This method also describes a dual-column option. The option allows a hardware,configuration of two analytical columns joined to a single injection port. The option allows one,injection to be used for dual-column analysis. Analysts are cautioned that the dual-column option,may not be appropriate when the instrument is subject to mechanical stress, many samples are to,be run in a short period, or when highly contaminated samples are analyzed.,1.7 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.). Example,chromatograms and GC conditions are provided as guidance.,1.8 The MDLs for Aroclors vary in the range ……
……