水中微量及痕量三氯甲烷、四氯化碳的顶空气相色谱测定法

Study on the Method for Determination of Micro and Trace Chloroform and Carbon Tetrachloride in Water by Static Headspace Gas Chromatography

目的研究水中微量及痕量三氯甲烷、四氯化碳的测定方法。方法利用三氯甲烷、四氯化碳在水中的弱溶解性,采用静止顶空气相色谱法,用OV-101色谱柱进行其微量及痕量分析。结果三氯甲烷在0.00～20.0μg/L浓度范围、四氯化碳在0.00～1.00μg/L浓度范围内呈良好线性关系,其r值分别为0.9998和0.9996,而三氯甲烷的最小检出浓度为0.19μg/L、四氯化碳的最小检出浓度为0.01μg/L,回收率在95%～110%之间。结论该方法干扰少,无二次污染,用此法进行矿泉水、井水、纯净水、水源水中三氯甲烷、四氯化碳的测定,结果满意。

Objective To study the method for determination of micro and trace chloroform and carbon tetrachloride in wa-ter by headspace chromatography.Methods Based on the mild solubility of chloroform and carbon tetrachloride in water,trace chloroform and carbon tetrachloride in water were analysed by static headspace gas chromatography using an OV-101chromato-graphic column.Results The better linear ranges for chloroform and carbon tetrachloride were0.00-20.0μg /L(r=0.9998)and0.00-1.00μg /L(r=0.996)respectively.The detection limits of chloroform and carbon tetrachloride were0.19μg /L and0.01μg /L respectively.The recovery rate of the method was95%-110%.Conclusion The method could be satisfactorily used for determination of chloroform and carbon tetrachloride in mineral water,well water,pure water and source-water with the advantage of less interfering factors and no secondary pollution.