摘要
目的建立溶剂解吸—气相色谱测定法同时检测工作场所空气中19种挥发性有机物(VOCs)的分析方法,19种挥发性有机物包括丙酮、乙酸乙酯、2-丁酮、二氯甲烷、苯、三氯乙烯、三氯甲烷、甲苯、1,2-二氯乙烷、乙酸丁酯、乙苯、对-二甲苯、间二甲苯、邻-二甲苯、氯苯、苯乙烯、1,2,4-三甲苯、环己酮、α-甲基苯乙烯。方法工作场所空气中多种VOCs经活性炭管采集,二硫化碳解吸后,注入气相色谱仪,经DB-WAX毛细管色谱柱分离,火焰离子化检测器(FID)检测;以保留时间定性,外标法定量。结果在所建立的试验条件下,19种物质分离良好,相关系数均>0.9997,检出限为0.10 mg/L^2.3 mg/L,相对标准偏差<3.3%,解吸效率为78.6%~96.6%。结论本法能够有效分离和准确测定空气中19种VOCs,具有较好的精密度与准确度,适合较复杂工作场所中空气毒物的测定,同时也为工作场所现场有害物质的识别提供支持。
Objective To establish a method for simultaneous determination of 19 volatile organic compounds including acetone,ethyl acetate,2- butanone,dichloromethane,benzene,trichloroethylene,trichloromethane,toluene,1,2- dichloro ethane,n- butyl acetane,p- xylene,m- xylene,o- xylene,chlorobenzene,styrene,1,2,4- trimethylbenzene,cylclohexanone andα- methylsyurene in the air of workplace by solvent desorption- gas chromatography. Methods Activated carbon tube was used for sampling VOCs. After adsorption with carbon disulfide,the desorbed solution was injected into the gas chromatography,and then separated by DB- WAX capillary column,detected by FID detector,and the retention times were used for qualitation and the external standard method was used for quantitation. Results Under the established experimental conditions,the 19 poisonous substances were separated well. The correlative coefficients of the method were above 0. 9997. Detection limits were0. 10 mg /L ~ 2. 3 mg /L with relative standard deviations of lower than 3. 3%. The desorption efficiency were in the range of78. 6% to 96. 6%. Conclusion This method can effectively separate and accuratly determine the 19 VOCs in workplace air with better accuracy and precision. And It was suitable for the determination of air toxics in the complex workplace. It can also provide support to identify poisonous substances in workplace air.
出处
《中国卫生检验杂志》
北大核心
2014年第18期2592-2595,共4页
Chinese Journal of Health Laboratory Technology
基金
浙江省科技厅项目(2011F10049)
浙江省科技厅项目(2013F10051)
浙江省卫生厅公共卫生检验检测重点学科群(XKQ-009.003)
关键词
挥发性有机物
溶剂解吸
气相色谱
Volatile organic compounds
Solvent desorption
Gas chromatography
