挥发性有机物采样方法的综合评价

Comprehensive evaluation on sampling methods of volatile organic compounds

采用吸附管采样法、气袋采样法及苏玛罐采样法,对挥发性有机物(VOCs)排放企业的固定排放源和环境进行平行采样.通过比较三种采样方法的VOCs检测结果及结果的相对标准差,得出三种方法的适用范围和方法精密度,并结合方法操作的采样准备、储运条件、分析周期、分析次数、易操作性、便携性及经济性对三种采样方法进行综合评价.得出,苏玛罐采样法具有操作简便、储运方便、精密度高的特点,但其对高浓度VOCs气体存在吸附作用,故推荐用于环境采样.气袋采样法和吸附管采样法具有适用范围广、携带方便、经济性好的特点,并有较高的精密度,在固定源采样中可取得较好的效果.

Adsorption tube sampling method, air bag sampling method and Summa canister sampling method were used to sample the exhaust from stationary source and environmental air of volatile organic compounds （VOCs） enterprises parallel. By comparing the detection results and relative standard deviations of results, the sampling method applicable scope and precision of three sampling methods were given. Combining with sample preparation, storage and transport conditions, operation period, analysis frequency, operability, portability, economy of the operation, the three sampling method were evaluated synthetically. It indicated that, Summa canister sampling method was operability well, easily to storage and transport and precision highly. But it has absorptive effect on high concentration VOCs gas, so Summa canister sampling method was recommended for stationary source exhaust sampling. Air bag sampling method and adsorption tube sampling method were widely applicable, portability, economical and precision highly, so they can achieve good effect in sampling from stationary source.