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目的建立生活饮用水中7种挥发性卤代烃含量检测结果的不确定度。方法用顶空气相色谱法测定生活饮用水中7种挥发性卤代烃的含量,从测定程序分析测量不确定度的来源,并对产生的不确定度各分量进行分析。结果当水样中含三氯甲烷12.95μg/L、四氯化碳0.51μg/L、三氯乙烯5.42μg/L、四氯乙烯4.99μg/L、一氯二溴甲烷4.95μg/L、二氯一溴甲烷2.66μg/L和三溴甲烷10.17μg/L时,其扩展不确定度分别为2.13、0.08、0.81、0.71、0.92、0.54和1.30μg/L(k=2)。结论影响顶空气相色谱法测定生活饮用水中7种挥发性卤代烃不确定度的因素主要是测量的重复性、标准使用液的配制、标准工作曲线拟合和样品回收率所产生的误差。
Objective To establish the uncertainty of the detection results of 7 volatile halocarbons in drinking water. Methods The headspace gas chromatography (HPLC) was used to determine the content of seven volatile halohydrocarbons in drinking water. The sources of measurement uncertainty were analyzed from the measurement program and the components of the uncertainty were analyzed. Results When the water sample contained 12.95μg / L of chloroform, 0.51μg / L of carbon tetrachloride, 5.42μg / L of trichlorethylene, 4.99μg / L of tetrachlorethylene, 4.95μg / L of chlorodibromomethane, The expanded uncertainty of 2.66 μg / L for methyl bromide and 10.17 μg / L for tribromomethane were 2.13,0.08,0.81,0.71,0.92,0.54 and 1.30 μg / L, respectively (k = 2). Conclusion The main determinants of the uncertainty of the seven volatile halohydrocarbons in domestic drinking water by headspace gas chromatography are the repeatability of measurement, the error of standard working solution formulation, standard working curve fitting and sample recovery .