快速消解-动态反应池电感耦合等离子体质谱(DRC-ICP-MS)法测定土壤中的汞  

Determination of Mercury in Soil by DRC-ICP-MS with Rapid Digestion

作　　者：李文兴 陈久耿 王国庆 LI Wenxing;CHEN Jiugeng;WANG Guoqing(Nanjing Institute of Environmental Sciences,Ministry of Ecology and Environment,Nanjing,Jiangsu 210042,China;Instrumental Analysis Center,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]生态环境部南京环境科学研究所,南京210042 [2]上海交通大学分析测试中心,上海200240

出　　处：《中国无机分析化学》2025年第3期315-322,共8页Chinese Journal of Inorganic Analytical Chemistry

基　　金：生态环境部事业类项目(ZX2024BSYF022);国家重点研发计划项目(2024YFC3713200);鄂尔多斯应用技术学院矿山地质与环境院士专家工作站开放课题(2024OITYSZJGZZ-006)。

摘　　要：汞(Hg)作为一种重金属污染物,广泛分布于环境中,特别是土壤环境。土壤中的汞可通过多种途径进入土壤生物和人体,对土壤生态安全和人类健康造成威胁。因此,土壤中汞的准确检测对于防治土壤污染和保护人类健康至关重要。采用动态反应池技术以氧气为反应气,通过优化氧气流量及副反应抑制参数(RPq)消除WO对^(202)Hg测定的质谱干扰,建立了一种快速消解法处理样品,动态反应池电感耦合等离子体质谱技术测定土壤中汞含量的方法。在最佳实验条件下,汞元素浓度在0~5μg/L线性关系良好,线性相关系数达到0.999 9,检出限为0.001 mg/kg,加标回收率为93.5%~99.3%,6次分析的精密度为2.3%。方法用于土壤标准物质GSS-38测定,结果与认证值一致。方法有效消除了汞含量测试时的质谱干扰,可以广范用于土壤中汞含量的准确测定。As a heavy metal pollutant,mercury is widely distributed in environment,particularly in soil.Soil mercury could accumulate in the soil organisms and human through various exposure routes,posing potential risks to soil ecological safety and human health.The accurate detection of mercury contents in soil is crucial for preventing soil pollution and protecting human health.A method for the determination of mercury contents in soil using inductively coupled plasma mass spectrometry(ICP-MS) with a dynamic reaction cell(DRC) technique was presented.The DRC technique was utilized to eliminate the mass spectral interference of tungsten oxide(WO) on the determination of ~(202)Hg by optimizing the oxygen flow rate and the side reaction inhibition parameter(RPq) with oxygen as the reaction gas.Under the optimal experimental conditions,the linear relationship of Hg concentration in the range of 0—5 μg/L was satisfactory with 0.999 9 of linear correlation coefficient,0.001 mg/kg of the detection limit,93.5%—99.3% of recoveries,and 2.3% of the accuracy of six analyses.This method was used for the determination of certified reference material of soil GSS-38,which were consistent with the certified values.This method effectively eliminates mass spectrometry interference of WO during the determination of mercury content,which can be widely applied for accurate mercury quantification in soil.

关 键 词：快速消解 动态反应池(DRC) 电感耦合等离子体质谱 汞 质谱干扰 

分 类 号：O657.63[理学—分析化学] X53[理学—化学]