D%204492%20–%2003%20%20气相色谱法分析苯的标准试验方法_.pdfVIP

Designation: D 4492 – 03 Standard Test Method for Analysis of Benzene by Gas Chromatography1 This standard is issued under the fixed designation D 4492; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval. 1. Scope* E 691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method3 1.1 This test method covers the determination of normally occurring trace impurities in, and the purity of, finished E 1510 Practice for Installing Fused Silica Open Tubular benzene by gas chromatography. Capillary Columns in Gas Chromatographs4 1.2 This test method was judged applicable for nonaromatic 2.2 Other Document: impurities at levels from 0.001 to 0.200 weight % and for OSHA Regulations. 29 CFR, paragraphs 1910.1000 and 1910.12005 benzene purities of 99.80 weight % or higher. 1.3 This test method is applicable for aromatic impurities 3. Summary of Test Method from 0.001 to 0.010 weight % in benzene. 1.4 The following applies to all specified limits in this 3.1 A known amount of an internal standard is added to the standard: for purposes of det