摘要
【目的】建立简单、准确、快速的生活饮用水中三氯甲烷和四氯化碳含量的测定方法。【方法】采用顶空-气相色谱分析方法,电子捕获检测器(ECD),顶空恒温炉60℃,样品恒温5 min,恒温炉内样品瓶加压1 min,压力16 Pa,毛细色谱柱为InertCap AQUATIC(60 m×0.25 mm, 1.00μm)。【结果】三氯甲烷在0~10μg/L范围内与峰面积呈很好的线性关系,范围内线性方程为y=10 178x+1 879.6,决定系数(r^(2))为0.999,三氯化碳的回收率和精密度分别为98.42~101.52%、0.8~2.6%,四氯化碳在0~5μg/L范围内与峰面积呈很好的线性关系,范围内线性方程为y=112 865x+6 986.1,决定系数(R^(2))为0.999,四氯化碳的回收率和精密度分别为98.08~102.88%、0.4~1.6%,三氯甲烷检出限为0.09μg/L,四氯化碳检出限为0.05μg/L。【结论】本方法检出限低于国标要求,符合国标要求且能有效的检测生活饮用水样品中三氯甲烷和四氯化碳的含量。
[Objective]To establish a simple, accurate and rapid method for the determination of chloroform and carbon tetrachloride in domestic drinking water [Methods]Using head-space gas chromatography with electron capture detection(ECD), it is constant oven temperature 60 ℃, constant temperature 5 min, sample bottle pressurized for 1 min and 16 Pa, capillary column InertCap AQUATIC(60 m×0.25 mm, 1.00 μm)[Results]The linear equation is y=10178x+1879.6 in the range of 0-10 μg/L. The coefficient of determination(r^(2)) is 0.999. The recovery and precision of carbon trichloride are 98.42%-101.52% and 0.8%-2.6% respectively. Carbon tetrachloride has a good linear relationship with peak area in the range of 0-5 μg/L. The linear equation in the range is y=112 865x+6 986.1, the determination coefficient(r^(2)) is 0.999, the recovery and precision of carbon tetrachloride are 98.08%-102.88%, 0.4%-1.6%, the detection limit of chloroform is 0.09 μg/L, and that of carbon tetrachloride is 0.05 μg/L. [Conclusions]The detection limit is lower than the national standard.. It can effectively detect the content of chloroform and carbon tetrachloride in domestic drinking water samples and meet the needs of large-scale detection tasks.
作者
赵毅
高秀芝
ZHAO Yi;GAO Xiuzhi(Beijing Laboratory of Food Quality and Safety/Beijing Key Laboratory of Agricultural Product Detection and Control of Spoilage Organisms and Pesticide Residue/Beijing Engineering Laboratory of Probiotics Key Technology Developm ent/Faculty of Food Science and Engineering,Beijing University of Agriculture,Beijing 102206,China)
出处
《北京农学院学报》
2021年第2期116-120,共5页
Journal of Beijing University of Agriculture
基金
现代农业产业技术体系北京市叶类蔬菜产业创新团队(BAIC07-2020)。
关键词
三氯甲烷
四氯化碳
顶空进样
饮用水
气相色谱
chloroform
carbon tetrachloride
headspace injection
domestic drinking water
gas chrom atography
