气相色谱法程序升温测定工作场所中的苯系物

目的建立气相色谱法测定工作场所中苯、甲苯、乙苯、对二甲苯、间二甲苯、邻二甲苯和苯乙烯的检测方法。方法确立本检测方法的条件试验，如色谱条件等；进行气相色谱法程序升温测定工作场所中苯系物的方法学试验。结果7种成份在11min内完成测定并具有较好的分离效果；在（0．4～700．0）μg／L浓度范围内可获得较好的直线方程，相关系数（r）为0．9990—0．9999；最低检出限分别为：苯0．2μg/L、甲苯2．5μg／L、乙苯3．6μg／L、对二甲苯3．6μg／L、间二甲苯0．9μg／L、邻二甲苯3．4μg/L、苯乙烯1．3μg／L。精密度RSD为1．1％～3．7％，回收率为90．0％-108．1％。结论此方法操作简便、重现性好，提高了灵敏度，适用于检测工作场所中苯系物的含量。

Programmed Temperature Gas Chromatography Determination of Workplace Benzene

Objective To establish the detection methods of benzene, toluene, ethylbenzene, p-xylene, m-xylene, o-xylene and styrene in workplace by gas chromatography. Methods Established the conditions of this detection method, such as chromatographic conditions, and methodology of programmed temperature gas chromatography for determination of benzene in the workplace. Results 7 ingredients were measured in 11 minutes with nice separation; Good linear equation within （0.4 - 700.0 ） μ g/L was obtained and correlation coefficient （r）was 0.9990-0.9999; Minimum detection limits were as follows： benzene 0.2 μg/L, toluene 2.5 μ g/ L, ethylbenzene 3.6μ g/L, p-xylene 3.6 μL g/L, m-xylene 0.9 μg/L, o-xylene 3.4 μg/L, styrene 1.3 μg/L. Precision RSD was 1.1%- 3.7% and average recovery was 90.0%-108.1%. Conclusion This method is simple, reproducible and can increase the sensitivity for detection of benzene content in the workplace.