Department of Chemistry, Analytical Chemistry, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland.
Department of Chemistry, Analytical Chemistry, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland.
Talanta. 2022 Apr 1;240:123163. doi: 10.1016/j.talanta.2021.123163. Epub 2021 Dec 21.
A selective method for preconcentration and determination of methylmercury (MeHg) and inorganic mercury (iHg) in natural water samples at the ng L level has been developed. The method involves adsorption of Hg species into a 3D printed metal scavenger and sequential elution with acidic thiourea solutions before ICP-MS determination. Experimental parameters affecting the preconcentration of MeHg and iHg such as the sample matrix, effect of the flow rate on adsorption, eluent composition, and elution mode have been studied in detail. The obtained method detection limits, considering the preconcentration factors of 42 and 93, were found to be 0.05 ng L and 0.08 ng L for MeHg and iHg, respectively. The accuracy of the method was assessed with a certified groundwater reference material ERM-CA615 (certified total iHg concentration 37 ± 4 ng L). The determined MeHg concentration was below MDL while iHg concentration was determined to be 41.2 ± 0.5 ng L. Both MeHg and iHg were also spiked to natural water samples at 5 ng L concentration and favorable spiking recoveries of 88-97% were obtained. The speciation procedure was successfully applied to two lake water samples where MeHg and iHg concentrations ranged from 0.18 to 0.24 ng L and 0.50-0.62 ng L, respectively. The results obtained demonstrate that the developed 3D printed metal scavenger-based method for preconcentration and speciation of Hg is simple and sensitive for the determination of Hg species at an ultra-trace level in water samples.
一种选择性的方法用于在纳克每升水平下预浓缩和测定天然水样中的甲基汞 (MeHg) 和无机汞 (iHg)。该方法涉及将 Hg 物种吸附到 3D 打印金属清除剂中，然后用酸性硫脲溶液进行顺序洗脱，再用 ICP-MS 测定。详细研究了影响 MeHg 和 iHg 预浓缩的实验参数，如样品基质、流速对吸附的影响、洗脱液组成和洗脱模式。考虑到 42 和 93 的预浓缩因子，获得的方法检测限分别为 0.05 ng L 和 0.08 ng L，用于 MeHg 和 iHg。方法的准确性通过认证的地下水参考物质 ERM-CA615（认证的总 iHg 浓度为 37 ± 4 ng L）进行评估。测定的 MeHg 浓度低于检测限，而 iHg 浓度则被测定为 41.2 ± 0.5 ng L。MeHg 和 iHg 也被添加到 5 ng L 浓度的天然水样中，获得了 88-97%的良好添加回收率。形态分析程序成功应用于两个湖水样品，其中 MeHg 和 iHg 的浓度分别为 0.18-0.24 ng L 和 0.50-0.62 ng L。结果表明，开发的基于 3D 打印金属清除剂的 Hg 预浓缩和形态分析方法简单灵敏，可用于测定水样中痕量 Hg 物种。
