您好，欢迎访问广东省农业科学院 机构知识库！
广东省农业科学院机构知识库

全部

  • 全部
  • 标题
  • 学者
  • 机构
  • 关键词

Fe (hydr)oxides and organic colloids mediate colloid-bound chromium mobilization in Cr(VI) contaminated paddy soil

文献类型： 外文期刊

作者： Liu, Ting 1 ; Wei, Ran 1 ; Li, Jingjing 1 ; Xie, Weipeng 1 ; Sun, Shengsheng 3 ; Deng, Tenghaobo 3 ; Wang, Shizhong 2 ; Tang, Yetao 2 ; Lin, Qingqi 1 ; Ni, Zhuobiao 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 & R, Guangzhou 510006, Peoples R China

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

关键词： Hexavalent chromium; Colloid; Field-flow fractionation; Iron (hydr)oxides; Rice

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：7.3； 五年影响因子：8.1 ）

ISSN： 0269-7491

年卷期： 2024 年 363 卷

页码：

收录情况： SCI

摘要： The association of chromium (Cr) with colloidal particles transport in contaminated sites can affect hexavalent chromium (Cr(VI)) migration and transformation, which is an important mechanism for Cr pollutants in soil and groundwater systems. Here, we investigated colloid and particle-bound Cr migration and transformation effects on rice Cr accumulation during different rice growth stages and different redox conditions in Cr(VI) contaminated soil by pot experiment. Results showed that 13-29% of soil Cr was water dispersible colloid-bound (100-1000 nm) form during rice growth. Using transmission electron microscopy - energy dispersion spectroscopy and asymmetric flow field - flow separation, we identified colloid-bound organic matter (OM) and iron (Fe), most likely in the form of Fe (hydr)oxides - clay composites, as the primary Cr carrier. Specifically, colloid-bound Cr was mainly associated with 125-350 nm soil particle size. Under different redox conditions, colloid- and nanoparticle-bound Cr concentration decreased with increasing nanoparticles zero-valent iron (nZVI) dose. Soil reoxidation promoted the colloid- and nanoparticle-bound Cr release due to the weakly crystalline Fe-(hydr) oxides reprecipitation. Further quantitative analysis showed that colloid-bound Cr concentrations were positively correlated with colloid-bound Mn concentrations during the whole rice growth soils. Most important of all, Cr content in rice grain was positively correlated with colloid-bound Cr significantly. This study provides a quantitative and size-resolved understanding of particle-bound Cr in paddy soils, highlighting the importance of colloid-bound Cr and Fe interactions in Cr geochemical cycle of paddy soil.

  • 相关文献
作者其他论文 更多>>
置顶
购物车
反馈

© 京ICP备09089781号-29 主办单位：广东省农业科学院

学术资源： 中国农业科学院 农业专业知识服务系统 农科联盟资源共建共享平台 中国农业科技文献与信息服务平台 中国农业期刊集成服务平台