空气中苯系物时间加权平均浓度测定方法

梅勇; 袁鹏; 杨磊; 马晓钟; 许斌

空气中苯系物时间加权平均浓度测定方法

Study on determination of time-weighted average concentration for benzene, toluene and xylenes in air

摘要

摘要:
目的建立工作场所空气中苯系物的时间加权平均浓度(TWA)气相色谱测定方法。
方法通过活性炭管采样, 溶剂解吸气相色谱法测定空气中苯、甲苯、二甲苯。
结果方法线性范围分别为苯2.0~5.0μg/ml, 甲苯3.1~100μg/ml, 二甲苯8.5~600μg/ml。相关系数介于0.9995~0.9999之间。检出限分别为苯2.0μg/ml, 甲苯3.1μg/ml, 二甲苯8.5μg/ml; 每100mg活性炭对苯、甲苯、二甲本的穿透容量分别为33.3, 29.1, 27.2mg。样品在活性炭管中稳定至少可保存7d, 方法重现性好。
结论此方法的各项指标均达到了工作场所空气中毒物检测方法研制规范的要求, 适用于工作场所空气中苯、甲苯、二甲苯的时间加权平均浓度测定。

Abstract:
Objective To establish a gas chromatogr aphic method with carbon disulfide desor ption for benzene, toluene and xylenes in time-weighted average(TWA)concentration in the workplace air.
Methods Solvents such as benzene, to luene and xylenes were sampled with charcoal tube.Solvent desorption with carbon disulfide and analysis by GC(FID)were performed.
Results Linear limits of the methods: benzene 210 to 50 μg/ml, toluene 3.1 to 100μg/ml and xylenes 8.5 to 600 μg/ml.The coefficient of correlation ranged from 0.999 5 to 0.999 9.Limit of detection of the solvents above were 210, 311 and 815 μg/ml.The breakthrough capacities of 100 mg charcoal for the solvents above were 33.3, 29.1 and 27.2 mg respectively.Samples could be storaged stablity at least 7 days under normal conditions.
Conclusion These methods were corresponding to the Chinese guidelines of the method for determination of toxic substances in workplace air and confirmed suitable to determine the selected solvents in TWA concentration in workplace air.

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