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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

作者： Liu, Ting 1 ; Li, Jingjing 2 ; Liu, Lirong 2 ; Jiang, Yanjun 2 ; Sun, Shengsheng 3 ; Deng, Tenghaobo 3 ; Wang, Shizhong 2 ; Tang, Yetao 2 ; Ni, Zhuobiao 1 ; Lin, Qingqi 1 ; Qiu, Rongliang 1 ;

作者机构： 1.South China Agr Univ, Coll Nat Resources & Environm, Guangdong Lab Lingnan Modern Agr, Guangdong Prov Key Lab Agr & Rural Pollut Abatemen, Guangzhou 510642, Peoples R China

2.Sun Yat Sen Univ, Sch Environm Sci & Engn, Guangdong Prov Key Lab Environm Pollut Control &, Guangzhou 510006, Peoples R China

3.Guangdong Acad Agr Sci, Inst Qual Stand & Monitoring Technol Agroprod, Guangzhou 510640, Peoples R China

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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