Retention of Mercury Sulfide Nanoparticles in Natural Soils.

IF 2.7 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Yuan Yuan, Weiping Cai, Yingnan Huang, Shuaishuai Shi, Yujun Wang, Fei Dang
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Abstract

Growing evidence has indicated that mercury sulfide nanoparticles (HgS NPs) are the potential precursors for neurotoxic methylmercury. But how and which soil components affect HgS NP retention remains unclear. Here, we examined the retention of uncoated and humic acid coated HgS NPs in 18 natural soils with varied properties. Our results suggested that the Kr values (retention coefficients) for uncoated and humic acid HgS NPs were 2.46 × 103 to 8.32 × 105 L kg- 1 and 3.00 × 103 to 2.73 × 105 L kg- 1, respectively. Soil properties (i.e., electrical conductivity, organic matter (OM), oxalate-extractable Fe and Mn) significantly affected the uncoated HgS NP retention, accounting for 69% of the variability in the Kr values. Meanwhile, OM exhibited a tendency to reduce coated HgS NP retention. Importantly, HgS NPs exhibited significant dissolution in representative soil porewaters. These findings highlight the soil property-dependent retention of HgS NPs in realistic environment.

硫化汞纳米颗粒在自然土壤中的滞留。
越来越多的证据表明,硫化汞纳米颗粒(HgS NPs)是神经毒性甲基汞的潜在前体。但是,土壤成分如何以及哪些成分影响HgS的NP保留尚不清楚。在这里,我们研究了未包被和腐植酸包被的HgS NPs在18种不同性质的天然土壤中的保留情况。结果表明,未包被HgS NPs和腐植酸HgS NPs的Kr值分别为2.46 × 103 ~ 8.32 × 105 L kg- 1和3.00 × 103 ~ 2.73 × 105 L kg- 1。土壤性质(即电导率、有机质、草酸盐可提取的铁和锰)显著影响未包覆的HgS的NP保留,占Kr值变化的69%。同时,OM有降低包被HgS NP滞留的趋势。重要的是,HgS NPs在代表性土壤孔隙水中表现出显著的溶解。这些发现强调了在现实环境中土壤性质对HgS NPs保留的依赖性。
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来源期刊
CiteScore
5.60
自引率
3.70%
发文量
230
审稿时长
1.7 months
期刊介绍: The Bulletin of Environmental Contamination and Toxicology(BECT) is a peer-reviewed journal that offers rapid review and publication. Accepted submissions will be presented as clear, concise reports of current research for a readership concerned with environmental contamination and toxicology. Scientific quality and clarity are paramount.
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