工作场所空气中甲基环己烷的气相色谱测定方法

目的 建立工作场所空气中甲基环己烷的气相色谱测定方法。方法 《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 100mg活性碳对甲基环己烷的穿透容量大于15．05mg，当甲基环巳烷的浓度为21．7－127．0mg/m^3时，采样效率均达99．64％－100．00％；样品在碳管中至少可保存8d，方法的重现性好，不同浓度的相对标准偏差（RSD）为4．4％－8．4％；平均解吸效率为91．8％－96．．6％；方法的最低检测浓度为0．13mg/m^3；空气中与甲基环巳烷共存的苯、甲苯、正巳烷、正庚烷等在本方法条件下不干扰测定。结论 此方法各项指标达到《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甲基环己烷的现场监测。

Gas chromatographic method for determination of air methylcyclohexane in workplace

Objective　To establish gas chromatographic method for determination of air methylcyclohexane in workplace. Method　This method was based on “Standardization of methods for determination of toxic substances in workplace air". Results　Breakthrough capacities of 100 mg of active carbon was >15.05 mg.Absorption efficiencies were 99.64%～100% when methylcyclohexane concentrations were 21.7～127.0 mg/m3.The sample could be stored in the active carbon tube at least for 8 days. Precision(RSD) was 4.4%～8.4%.Desorption efficiencies were 91.8%～96.6%,the lowest detection limit was 0.13 mg/m3.Other volatilizable organic solvents,e.g.,benzene,n-heptane,n-hexane,toluene were not interferences. Conclusion　This method meets the requirement of "Standardization of methods for determination of toxic substances in workplace air". It is suitable for determination of methylcyclohexane in workplace air.