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适用范围：<p>This test method provides sufficient PCB data for many regulatory requirements. While the most common regulatory level is 50 ppm (dry weight corrected), lower limits are used in some locations. Since sensitivities will vary for different types of samples, one shall demonstrate a sufficient method detection limit for the matrix of interest.</p> <p>This test method differs from Test Method D 4059<astmref rid="a00001"> in that it provides for more sample clean-up options, utilizes a capillary column for better pattern recognition and interference discrimination, and includes both a qualitative screening and a quantitative results option. </p><p id="s00002">1.1 This test method covers a two-tiered analytical approach to PCB screening and quantitation of liquid and solid wastes, such as oils, sludges, aqueous solutions, and other waste matrices. </p> <p id="s00003">1.2 Tier I is designed to screen samples rapidly for the presence of PCBs.</p> <p id="s00004">1.3 Tier II is used to determine the concentration of PCBs, typically in the range of from 2 to 50 mg/kg. PCB concentrations greater than 50 mg/kg are determined through analysis of sample dilutions. </p> <p id="s00005">1.4 This is a pattern recognition approach, which does <span class="italic">not</span> take into account individual congeners that might occur, such as in reaction by-products. This test method describes the use of Aroclors 1016, 1221, 1232, 1242, 1248, 1254, 1260, 1262, and 1268, as reference standards, but others could also be included. Aroclors 1016 and 1242 have similar capillary gas chromatography (GC) patterns. Interferences or weathering are especially problematic with Aroclors 1016, 1232, and 1242 and may make distinction between the three difficult.</p> <p id="s00006">1.5 This test method provides sample clean up and instrumental conditions necessary for the determination of Aroclors. Gas chromatography (GC) using capillary column separation technique and electron capture detector (ECD) are described. Other detectors, such as atomic emission detector (AED) and mass spectrometry (MS), may be used if sufficient performance (for example, sensitivity) is demonstrated. Further details about the use of GC and ECD are provided in Practices E 355<astmref rid="a00005">, E 697<astmref rid="a00006">, and E 1510<astmref rid="a00007">.</p> <p id="s00007">1.6 Quantitative results are reported on the dry weights of waste samples.</p> <p id="s00008">1.7 Quantification limits will vary depending on the type of waste stream being analyzed.</p> <p>1.8 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.</p> <p id="s00009">1.9 <span class="italic">This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulator limitations prior to use.</span>