HG-ICP-AES法测定多金属矿区人发中的汞和砷

Determination of Trace Mercury and Arsenic in Human Hair of Polymetallic Mining Area by HG-ICP-AES

应用ICP-2070型等离子体发射光谱仪和氢化物发生技术,采用HNO3-HClO4酸消解体系,建立了生物样品中痕量汞和砷的氢化物发生-等离子体发射光谱检测法(HG-ICP-AES法)。在选定的实验条件下,Hg和As的检测限分别达到0.6和0.8ng.mL-1,且分析稳定性较好,能满足生物样品中痕量Hg和As的检测要求。对人发、大米和茶叶等国家标准物质中Hg和As的含量进行对照测定,检测结果与推荐值一致,测定结果的RSD均在5%左右。与此同时,应用本法实测了湘西多金属矿区人发中Hg和As的含量,发现该矿区发Hg和发As平均含量为1.290和1.865μg.g-1,分别为对照的3.59倍和2.44倍。表明湘西矿区人群Hg和As暴露危害严重,须引起相关部门重视。

In the present paper, a method for the determination of trace elements such as Hg and As in biological samples by HG-ICP-AES was presented. Under the optimum experimental conditions and instrumental operation parameters, both the RSDs of Hg and As with the method were below 3%, and the detection limits were 0.6 ng Hg · mL^-1 and 0.8 ng As · mL^-1 , respectively, satisfying the demand of detecting trace Hg and As concentration in biological samples. Meanwhile, the analytical results of Hg and As in the national standard reference samples such as human hair （GBW 09101）, rice （GBW 08503） and tea leaf （GBW 08505） were in good agreement with the certified values, with RSDs around 5%. Using the HG-ICP-AES method, the concentrations of Hg and As in human hair samples of polymetallic mining area in western Hunan province were determined, and the result shows that human in the mining area was exposed to high levels of Hg and As. The concentrations of Hg and As in the mining area were 1. 290 and 1. 865μg · g^-1 respectively, 3.59 and 2.44 times higher than those in the control area, respectively.