摘要
该试验建立了高通量真空平行浓缩仪-ICP-MS法检测直饮水中的铜、铅、镉、铬、砷、汞、铝金属污染物残留的分析方法。直饮水样品经高通量真空平行浓缩仪浓缩,控制温度80℃、氮吹速度1.5 mL/min,浓缩至10 mL左右,转移至25 mL量瓶中,加0.75 mL硝酸,用纯化水定容至标线,上电感耦合等离子体质谱仪,内标法定量检测。结果显示,7种重金属在质量浓度0.05~10μg/L范围内具有良好的线性关系,相关系数大于0.995;铜、铅、镉、铬、砷、汞、铝检测限分别为0.005,0.003,0.008,0.009,0.011,0.008和0.012 mg·kg-1;在0.05,0.5和5 mg/kg三水平下,加标回收率分别为103.7%,100.2%,97.3%,98.5%,98.7%,94.4%和93.6%;重复性RSD分别为3.54%,2.64%,3.81%,3.72%,2.95%,3.48%和4.32%(n=6)。该方法具有简便、快速、准确等特点,适用于直饮水中重金属污染物残留的监测。
It was to establish high flux vacuum parallel concentrator-ICP/MS method for detection of seven metal pollutants(copper,plumbum,cadmium,chromium,arsenic,mercury and aluminum)in drinking water.Drinking water samples were condensed in high flux vacuum parallel concentrator,temperature was controlled at 80℃,and nitrogen blow rates were 1.5 m L/min.Samples were condensed to about 10 mL and transferred to 25 mL volumetric flask,and 0.75 mL nitric acid was added and constant volumed by purified water.Samples were analyzed on ICP-MS,and internal standard method was selected as quantitative detection.The results showed that 7 heavy metals had good linear relationships in the range of 0.05-10μg/L,with correlation coefficients all above 0.995.Detection limits were copper 0.005 mg·kg-1,plumbum 0.003 mg·kg-1,cadmium 0.008 mg·kg-1,chromium 0.009 mg·kg-1,arsenic 0.011 mg·kg-1,mercury 0.008 mg·kg-1 and aluminum 0.012 mg·kg-1,respectively.The average recoveries in 3 different levels of 0.05,0.5 and 5 mg/kg were 103.7%,100.2%,97.3%,98.5%,98.7%,94.4%and 93.6%.Relative standard deviation of reproducibility was 3.54%,2.64%,3.81%,3.72%,2.95%,3.48%and 4.32%.This method was simple,rapid and accurate,and it was suitable for detection of metal pollutant in drinking water.
作者
朱玲玲
肖昭竞
李根容
童兰艳
余文琴
ZHU Lingling;XIAO Zhaojing;LI Genrong;TONG Lanyan;YU Wenqin(Chongqing Institute of Measurement and Quality Inspection,National Center for Quality Supervision and Inspection of Agricultural and Sideline Products and Condiments,Chongqing 401123)
出处
《食品工业》
CAS
北大核心
2020年第12期295-298,共4页
The Food Industry
基金
重庆市市场监督管理局(原重庆市质量技术监督局)
科研计划项目(No:CQZJKY2016031)。
