An improved method for recovering and preconcentrating mercury in natural water samples for stable isotope analysis | |
Kai Li; Che-Jen Lin; Wei Yuan; Guangyi Sun; Xuewu Fu; Xinbin Feng | |
2019 | |
发表期刊 | Journal of Analytical Atomic Spectrometry |
卷号 | 34期号:11页码:2303-2313 |
摘要 | The composition of stable mercury (Hg) isotopes provides important chemical signatures for tracing the sources and transformation pathways of Hg in the environment. However, such measurements are challenging for natural water samples due to the ultratrace levels of Hg and therefore preconcentration of Hg in water is needed prior to isotope measurements. In this study, we developed a preconcentration method using a modulated apparatus that can be deployed for field measurements. The system includes a 3 L bubbler, a chlorine-impregnated activated carbon (ClC) trap, a zero-air filter connected to the inlet, and a vacuum pump. Hg in aqueous phase samples is first oxidized with BrCl and then reduced with SnCl2. The produced Hg0 is purged from the aqueous phase at a flow rate of 2.5 L min−1 for 1 hour and collected by a trap containing 550 mg of ClC. Hg collected in the ClC trap is then thermally desorbed in argon carrier gas and preconcentrated into a 40% mixed acid solution (4 M HNO3 and 1.3 M HCl). This method was evaluated using solutions spiked with NIST SRM 3133, UM-Almadén and BCR 482 standards at Hg concentrations of 0.5 to 40 ng L−1. The results showed an analytical recovery of 98.8 ± 3.7% (1SD, n = 37) with enrichment factors of up to 1000 times and no significant difference in isotope compositions between the recovered Hg and original standards (t-test, p-δ202Hg = 0.24, p-Δ199Hg = 0.58, and p-Δ200Hg = 0.87). Duplicate experiments on field aqueous samples showed that the analytical precision was 0.13‰, 0.06‰ and 0.07‰ (n = 16) for δ202Hg, Δ199Hg and Δ200Hg, respectively. The developed method is reliable and efficient for concentrating Hg in natural water samples for determining the Hg isotopic compositions. |
收录类别 | SCI |
语种 | 英语 |
文献类型 | 期刊论文 |
条目标识符 | http://ir.gyig.ac.cn/handle/42920512-1/10817 |
专题 | 环境地球化学国家重点实验室 |
作者单位 | 1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China 2.University of Chinese Academy of Sciences, Beijing 100190, China 3.Center for Advances in Water and Air Quality, Lamar University, Beaumont, Texas 77710, USA 4.Department of Civil and Environmental Engineering, Lamar University, Beaumont, Texas 77710, USA 5.CAS Center for Excellence in Quaternary Science and Global Change, Xi'an, 710061, China |
推荐引用方式 GB/T 7714 | Kai Li,Che-Jen Lin,Wei Yuan,et al. An improved method for recovering and preconcentrating mercury in natural water samples for stable isotope analysis[J]. Journal of Analytical Atomic Spectrometry,2019,34(11):2303-2313. |
APA | Kai Li,Che-Jen Lin,Wei Yuan,Guangyi Sun,Xuewu Fu,&Xinbin Feng.(2019).An improved method for recovering and preconcentrating mercury in natural water samples for stable isotope analysis.Journal of Analytical Atomic Spectrometry,34(11),2303-2313. |
MLA | Kai Li,et al."An improved method for recovering and preconcentrating mercury in natural water samples for stable isotope analysis".Journal of Analytical Atomic Spectrometry 34.11(2019):2303-2313. |
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