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石墨消解-ICP-MS法测定土壤中八种重金属元素

发表时间:2016-07-15  浏览量:4956  下载量:2697
全部作者: 童伟,韩霁昌,王欢元
作者单位: 陕西省土地工程建设集团,陕西省土地整治工程技术研究中心,国土资源部退化及未利用土地整治工程重点实验室;西安理工大学水利水电学院
摘 要: 以国家标准物质GBW07454(GSS-25)为标准土样,采用HNO3-H2O2-HF消解体系,对比全自动石墨消解和红外消解两种前处理方法。选择Sc、Rh、Lu为内标元素,建立一种应用电感耦合等离子体质谱(inductively coupled plasma mass spectrometry,ICP-MS)法测定土壤样品中Cr、Ni、Cu、Zn、As、Cd、Hg和Pb八种重金属元素的方法。结果表明:除Hg外,石墨消解法的相关系数都在3个9以上,该方法测定的试样中各元素的相对标准偏差(relative standard deviation,RSD)为0.31%~7.32%,回收率为99.2%~103.3%,相对偏差为0.36%~9.14%. 相比红外消解法,石墨消解法具有加热均匀、消解时间短、样品污染小、操作简便、一次可处理大批样品等优势。同时,利用建立的方法检测关中平原地区土壤样品中Cr、Ni、Cu、Zn、As、Cd、Hg和Pb八种重金属元素含量。试样分析结果表明,除Hg外,关中平原地区土壤重金属含量均符合国家《土壤环境质量标准》中的二级标准。
关 键 词: 分析化学;电感耦合等离子体质谱法;石墨消解;红外消解;土壤;重金属
Title: Determination of 8 heavy metal elements in soil by ICP-MS using graphite digestion
Author: TONG Wei, HAN Jichang, WANG Huanyuan
Organization: Key Laboratory of Degraded and Unused Land Consolidation Engineering, Ministry of Land and Resources of China, Shaanxi Province Land Reclamation Engineering Technology Research Center, Shaanxi Provincial Land Engineering Construction Group; Institute of Water Resources and Hydro-Electric Engineering, Xi’an University of Technology
Abstract: Graphite furnace digestion and infrared heating digestion pretreatment method were compared in this experiment by HNO3-H2O2-HF digestion system using national standard substances GBW07454 (GSS-25) as the standard soil samples. The Sc, Rh and Lu were chosen as the internal standard elements and a method of using inductively coupled plasma mass spectrometry (ICP-MS) to measure the heavy metals contents of Cr, Ni, Cu, Zn, As, Cd, Hg and Pb was established. The results showed that the correlation coefficients of graphite furnace digestion method for all heavy metals were more than 0.999, except for Hg. Meanwhile, for graphite furnace digestion method, the relative standard deviation (RSD) was 0.31%-7.32%, and the recovery rate was 99.2%-103.3%, and the relative deviation was 0.36%-9.14%. Compared to the infrared heating digestion method, the graphite furnace digestion method proved to be uniform heating, rapid digestion, less pollution, simple operation and was suitable for the mass sample treatment. Besides, the Cr, Ni, Cu, Zn, As, Cd, Hg and Pb contents of soil samples in Guanzhong plain were measured in this experiment with the constructed method. Results indicated that the Cr, Ni, Cu, Zn, As, Cd, and Pb contents of soil in Guanzhong plain met the secondary-rate standard of the National Soil Environmental Quality.
Key words: analytical chemistry; inductively coupled plasma mass spectrometry; graphite digestion; infrared digestion; soil; heavy metal
发表期数: 2016年7月第13期
引用格式: 童伟,韩霁昌,王欢元. 石墨消解-ICP-MS法测定土壤中八种重金属元素[J]. 中国科技论文在线精品论文,2016,9(13):1338-1344.
 
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