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经济的飞速发展导致大气中重金属污染的高风险，引发人们高度重视。因此，准确评价大气重金属污染状况对保障公众健康具有重要意义。本研究采用沸水浴-王水的消解方式，通过对试样消解体系、消解时间以及对仪器测试条件(KBH4、HCl浓度)等工作参数的优化，建立了氢化物发生-原子荧光光谱仪测定大气湿沉降中Hg、As的分析方法。在优化条件下，采用王水占比20%的消解体系，水浴同时消解Hg、As60 min后冷却定容，仪器优化后直接测定Hg，剩余消解液各加约0.30 g固体硫脲-抗坏血酸还原30 min后测定As。本方法 Hg、As检出限分别为0.033μg/L和0.27μg/L，线性相关系数均≥0.999。将其应用于水质环境标准样品分析，相对误差(RE)为-1.43%～0.69%，相对标准偏差(RSD)为0.32%～3.2%。同时对大气湿沉降中实际样品中的Hg、As进行分析结果与生态环境部HJ 694—2014方法测定结果相吻合。本方法具有线性范围宽，前处理简单高效、重现性好及相对偏差小的优势，能够满足对大气湿沉降中Hg、As进行高效定量分析需求。
Abstract：The rapid development of the economy has increased the risk of heavy metal pollution in the atmosphere,which has attracted great attention from the public.Therefore, accurately evaluating the status of heavy metal pollution in the atmosphere is of great significance for safeguarding public health.Atmospheric wet deposition has both advantages and disadvantages. While it can purify the atmosphere, it also introduces heavy metals and organic pollutants into the ecosystem. Mercury(Hg) and arsenic(As) can accumulate in organisms through the food chain, affecting the growth and development of plants and animals. These substances can then be transmitted to humans through food, posing risks to human health.However, in practical work, it has been found that the existing analysis methods are complex and cumbersome to operate, and the reproducibility of the results is poor. This study employed boiling water bath–aqua regia digestion method, optimizing parameters such as the sample digestion system, digestion time, and instrumental testing conditions(KBH4 and HCl concentrations) to establish an analysis method for determining Hg and As in atmospheric wet deposition using hydride generation-atomic fluorescence spectrometry. Under optimized conditions, a digestion system with 20% aqua regia was used. Hg and As were simultaneously digested in a water bath for 60 min and then cooled to volume. After instrument optimization, Hg was directly measured first, and the remaining digestion solution was reduced by approximately 0.30 g of solid thiourea–ascorbic acid for 30 min before As was measured.the detection limits of Hg and As by this method are 0.033 μg/L and 0.268 μg/L, respectively, and the linear correlation coefficients are both ≥ 0.999. At the same time, the analysis results of Hg and As in actual atmospheric wet deposition samples are consistent with those obtained by the method in HJ 694—2014 issued by the Ministry of Environmental Protection.This method was used to determine the total arsenic capacity validation sample in water from the National Geological Experiment Testing Center in 2024(Plan No. ZRZY-2024-3-038). The result(26.3 μg/L) was consistent with that of HJ 694—2014, with a robust mean of 25.93, a robust standard deviation of 0.528 8 μg/L,and an inter laboratory z-ratio score of 1.1, indicating that the evaluation was qualified. This method has the advantages of wide linear range, simple and efficient preprocessing, good reproducibility, and small relative deviation, which can meet the needs of efficient quantitative analysis of Hg and As in atmospheric wet deposition,It can provide technical support for strengthening the monitoring and control of key pollution sources,improving the monitoring network of atmospheric wet deposition, and developing remediation methods for arsenic and mercury in soil and water.
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基本信息:
中图分类号:X831;O657.31
引用信息:
[1]刘春霞,于亚辉,韩瑞,等.沸水浴消解-氢化物发生-原子荧光光谱法测定大气湿沉降中Hg、As[J].中国无机分析化学().
基金信息:
国家重点研发计划项目(2019YFC1804805); 豫地科研项目[2025]2号
2026-07-29
2026-07-29
2026-07-29