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METHOD 8020 <br />AROMATIC VOLATILE ORGANICS <br />1.0 Scope and Application <br />1.1 Method 8020 is used to determine the concentration of various <br />aromatic volatile organic compounds in groundwater, liquid, and solid <br />matrices. Specifically, Method 8020 may be used to detect the following <br />substances: <br />Benzene <br />Chlorobenzene <br />1,2 -Dichlorobenzene <br />1,3 -Dichlorobenzene <br />1,4 -Dichlorobenzene <br />Ethyl benzene <br />Toluene <br />Xylenes (Dimethyl benzenes) <br />1.2 This method is recommended for• <br />of, analysts experienced in the operation <br />interpretation of chromatograms. <br />2.0 Summary of Method <br />use by, or under the supervision <br />of gas chromatographs and in the <br />2.1 Method 8020 provides chromatographic conditions for the detection <br />of aromatic volatile organic compounds. Waste samples can be analyzed <br />using direct injection, the headspace method (Method 5020) or the purge - <br />and -trap method (Method 5030). Groundwater samples should be determined <br />using Method 5030. A temperature program is used in the gas chromatograph to <br />separate the organic compounds. Detection is achieved by a photo -ionization <br />detector (PID). <br />2.2 If interferences are encountered, the method provides an optional <br />gas chromatographic column that may be helpful in resolving the compounds of <br />interest from the interferences. <br />3.0 Interferences <br />3.1 Samples can be contaminated by diffusion of volatile organics <br />through the sample container septum during shipment and storage. A field <br />sample blank prepared from reagent water and carried through sampling and <br />subsequent storage and handling can serve as a check on such contamination. <br />3.2 Contamination by carryover can occur whenever high-level and low- <br />level samples are sequentially analyzed. To reduce carryover, the sample <br />