空气中正己烷、苯系物同时测定的热解吸气相色谱法

目的建立工作场所空气中正己烷、苯、甲苯、二甲苯同时测定的热解吸气相色谱方法。方法按照《车间空气监测检验方法研究规范》的要求进行实验室实验及现场实验。结果正己烷、苯、甲苯、二甲苯方法的平均相对标准偏差在4．9％以内,方法的最低检测浓度均在2．4mg/m^3以内,热解吸效率均在80％以上,空气中正己烷、苯、甲苯、二甲苯等在该方法条件下可同时分别测定。结论该方法各项指标均达到《车间空气监测检验方法研究规范》的要求,适用于工作场所空气中正己烷、苯、甲苯、二甲苯的同时监测。

Thermal Desorption Gas Chromatography for the Simultaneous Determination of N-Hexane and Benzene in the air of workplaces

Objective] To establish thermal desorption gas chromatography for the determination of n-hexane and benzene in the air of workplaces.Methods] Laboratorial and site experiments were carried out according to the "Standardization of the Methods for the Determination of Toxic Substances in the Air of Workplaces".Results] The RSD of n-hexane,benzene,toluene and xylene was below(4.9%;) the lowest detection limit was within 2.4 mg/m~3;the thermal desorption efficiency was above 80%;n-hexane,benzene,toluene and xylene in the air of workplaces can be determined simultaneously with this method.Conclusion] This method meets the requirement of "Standardization of the Methods for the Determination of Toxic Substances in the Air of Workplaces" and can be applied for the simultaneous determination of n-hexane,benzene,toluene and xylene in the air of workplaces.