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Gold determination in soil by ICP-MS: comparison of sample pretreatment methods
Journal of Analytical Science and Technology ( IF 2.4 ) Pub Date : 2020-10-15 , DOI: 10.1186/s40543-020-00245-3
Xiaodan Tang , Bing Li , Jilong Lu , Hongyan Liu , Yuyan Zhao

At present, the direct gold determination in geological samples by inductively coupled plasma mass spectrometry (ICP-MS) is still an arduous challenge due to both spectral and background interferences. It is very important and necessary to study the pretreatment processes; therefore, the polyurethane foam treatment and sample digestion methods are explored and compared here. The experimental results showed that the gold adsorption rate of treated foam was significantly improved as the impurities in the foam were cleaned up, and the potential difference of the liquid membrane was increased. Meanwhile, the combination of the foam enrichment and thiourea desorption achieved the selective adsorption and desorption of gold ions, eliminated the interference of coexisting ions, and perfected the detection limits. Compared with the traditional electric heating plate digestion method, microwave digestion, a closed digestion method, had the advantages of less sample and reagent dosage, short time consumption, high degree of automation, thorough digestion, good security, and environmental friendliness and met the requirements of green chemistry development. The proposed microwave digestion-foam enrichment-thiourea desorption-ICP-MS determination method was applied to the gold test in soil samples of the actual gold mining area. It has the great potential as a routine laboratory procedure.

中文翻译:

ICP-MS 测定土壤中的金:样品预处理方法的比较

目前,由于光谱和背景干扰,电感耦合等离子体质谱(ICP-MS)直接测定地质样品中的金仍然是一项艰巨的挑战。研究预处理过程是非常重要和必要的;因此,本文对聚氨酯泡沫处理和样品消解方法进行了探索和比较。实验结果表明,随着泡沫中杂质的清除,液膜电位差的增大,处理后泡沫的金吸附率显着提高。同时,泡沫富集与硫脲解吸相结合,实现了金离子的选择性吸附和解吸,消除了共存离子的干扰,完善了检出限。与传统电热板消解法相比,微波消解作为一种封闭消解方法,具有样品试剂用量少、耗时短、自动化程度高、消解彻底、安全性好、环保等优点,满足要求。绿色化学发展。将所提出的微波消解-泡沫富集-硫脲解吸-ICP-MS测定方法应用于实际金矿区土壤样品的金检测。它具有作为常规实验室程序的巨大潜力。和环境友好,满足绿色化学发展的要求。将所提出的微波消解-泡沫富集-硫脲解吸-ICP-MS测定方法应用于实际金矿区土壤样品的金检测。它具有作为常规实验室程序的巨大潜力。和环境友好,满足绿色化学发展的要求。将所提出的微波消解-泡沫富集-硫脲解吸-ICP-MS测定方法应用于实际金矿区土壤样品的金检测。它具有作为常规实验室程序的巨大潜力。
更新日期:2020-10-15
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