【摘要】 目的建立工作场所中空气中环氧乙烷、呋喃、二氯甲烷、苯、甲苯的便携式气相色谱现场快速检测方法。方法利用动态气体稀释仪配制标准气体,标准气体和空气样品内置恒流采样泵抽取,经色谱柱分离后用Voyager便携式气相色谱仪(光离子化检测器)检测,以保留时间定性,峰面积定量。结果便携式气相色谱仪在柱温60℃,柱前压9psi条件下,5种物质分离效果良好,环氧乙烷在0.45~90.72mg/m~3、呋喃在0.22~44.50 mg/m~3、二氯甲烷在2.19~437.4 mg/m~3、苯在0.32~13.29 mg/m~3、甲苯在0.38~15.68 mg/m~3范围内具良好线性关系,均R~2≥0.999,检出限分别为0.03、0.04、0.2、0.008和0.03 mg/m~3,相对标准偏差分别为0.79%~2.4%、1.5%~1.9%、0.97%~1.8%、2.3%~3.2%和3.4%~4.6%,回收率分别为101.4%~108.4%、85.49%~94.98%、97.78%~106.2%、99.29%~103.5%和95.54%~101.7%。空气样品同时采用7890A台式气相色谱仪进行对比测定,结果环氧乙烷、呋喃、二氯甲烷、苯、甲苯的相对误差分别为0.091%~8.8%、3.8%~6.7%、0.77%~9.4%、0.24%~1.6%和0.31%~8.0%。结论该方法操作简便、准确、灵敏,分离效果好,分析周期短,可用于职业危害现场的快速检测。更多还原

【Abstract】 Objective To establish a portable gas chromatography( GC) method for the on-site rapid determination of epoxyethane,furan,dichloromethane,benzene,toluene in workplace. Methods By using dynamic dilutor,the volatile organic compounds( VOCs) standard gas was prepared and drawn to the capillary column of GC( PID) for separation and analysis. Based on the retention time and peak area,the VOCs was identified and quantified. Results At the conditions of 60℃ column temperature and9 psi pre-pressure,The five VOCs were well separated. Good linear ranges were obtained within the ranges of 0. 45- 90. 72 mg/m~3 for epoxyethane,0. 22- 44. 50 mg/m~3 for furan,2. 19- 437. 4 mg/m~3 for dichloromethane,0. 32- 13. 29 mg/m~3 for benzene,0. 38-15. 68 mg/m~3 for toluene,respectively. The correlation coefficient was not less than0. 999. The detection limits were 0. 03, 0. 04, 0. 2, 0. 008 and 0. 03 mg/m~3,respectively. The RSD were 0. 79%- 2. 4%,1. 5%- 1. 9%,0. 97%- 1. 8%,2. 3%-3. 2% and 3. 4%- 4. 6%,respectively. The average recovery were 101. 4%- 108. 4%,85. 49%- 94. 98%,97. 78%- 106. 2%,99. 29%- 103. 5% and 95. 54%- 101. 7%,respectively. By using the 7890 A GC method,the relative tolerance for the same gas samples were 0. 091%- 8. 8% for epoxyethane,3. 8%- 6. 7% for furan,0. 77%-9. 4% for dichloromethane,0. 24%- 1. 6% for benzene,0. 31%- 8. 0% for toluene.Conclusion The method is portable,accurate,sensitive,rapid,and exhibits good separation and anti-interference ability. This method is suitable for the rapid detection of VOCs in workplace and also provides reference VOC detection method for the occupational health standard.更多还原