Mobilization of water-dispersible colloidal chromium and nickel in basalt-derived paddy soils: Role of Fe (hydr)oxides and organic matter

文献类型： 外文期刊

第一作者： Liu, Ting

作者： Liu, Ting;Ni, Zhuobiao;Lin, Qingqi;Qiu, Rongliang;Li, Jingjing;Liu, Lirong;Jiang, Yanjun;Wang, Shizhong;Tang, Yetao;Qiu, Rongliang;Sun, Shengsheng;Deng, Tenghaobo

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关键词： High geochemical background; Colloid; Field-flow fractionation; Chromium; Nickel isotope

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：11.3； 五年影响因子：12.4 ）

ISSN： 0304-3894

年卷期： 2025 年 496 卷

页码：

收录情况： SCI

摘要： Basalt weathering can lead to heavy metal enrichment in soils, and nickel (Ni) isotopes can served as an effective tracer for this weathering process. Water-dispersible colloids (WDCs) are ubiquitous in soil environments and can facilitate the long-range transport of sorbed pollutants. Here, we analyzed soil colloidal distribution, concentration, morphology and Ni isotopes in soil to understand the potential mobilization of WDC-bound Cr and Ni in basalt-derived paddy soils. Ultrafiltration results showed that on average > 90 % of Cr (4714.0 mu g L-1) and Ni (4532.3 mu g L-1) in soil solution occurring in colloid-bound form (< 1000 nm). Using AF4-UV-ICP-MS and STEM-EDS, we found that iron (Fe)-organic matter composite minerals colloids are primary carriers of Cr and Ni. Specifically, colloid-bound Cr/Ni were mainly associated with nanoparticles (1-20 nm) and fine colloid (125-350 nm) soil particle size. Notably, high weathering intensity and pH promoted the release of WDCs- Cr and Ni. Soil Ni isotopes shown light delta Ni-60 composition (-0.17 parts per thousand similar to -0.11 parts per thousand), primarily determined by Ni incorporation into Fe-(hydr)oxides. Ni isotopes revealed that Ni in soil and rice originates from parent rocks. These results highlighted the pivotal role of the WDCs mobilizing heavy metals in naturally high background paddy soils.

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