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8020 / 9 <br />TABLE 1. RETENTION TIMES FOR SOME AROMATIC VOLATILE ORGANICS <br />Retention Method detection <br />Compound time (min) limita (pg/1) <br />Benzene <br />3.33 <br />0.2 <br />Chlorobenzene <br />9.17 <br />0.2 <br />1,4 -Dichlorobenzene <br />16.8 <br />0.3 <br />1,3 -Dichlorobenzene <br />18.2 <br />0.4 <br />1,2 -Dichlorobenzene <br />25.9 <br />0.4 <br />Toluene <br />5.75 <br />0.2 <br />Ethyl Benzene <br />8.25 <br />0.2 <br />Xylenes <br />Benzene <br />91 <br />Column: 6 -ft x 1/8 -in. column packed with 1.75% <br />Bentone 34 and 5% SP -2100 on Supelcoport 100/200. <br />allsing purge -and -trap Method 5030. See also <br />Section 8.3. <br />TABLE 2. <br />SINGLE OPERATOR <br />ACCURACY AND PRECISION <br />Average <br />Standard <br />Spike____ <br />Number <br />r - <br />Parameter <br />percent <br />deviation <br />range <br />of <br />Matrix <br />recovery <br />(%)-_Y-(pg/1 <br />M/1) <br />) <br />- analyses <br />types <br />Benzene <br />91 <br />10.0 <br />0.5-9.7 <br />21 <br />3 Y <br />Chlorobenzene <br />97 <br />9.4 <br />0.5-100 <br />21 <br />3 <br />1,2 -Dichlorobenzene <br />104 <br />27.7 <br />0.5-10.0 <br />21 <br />3 <br />1,3 -Dichlorobenzene <br />97 <br />20.0 <br />0.5-4.8 <br />21 <br />3 <br />1,4 -Dichlorobenzene <br />120 <br />20.4 <br />0.5-10.0 <br />21 <br />3 <br />Ethylbenzene <br />98 <br />12.4 <br />0.5-9.9 <br />21 <br />3 <br />Toluene <br />77 <br />12.1 <br />0.5-100 <br />21 <br />3 <br />