Correlation Engine 2.0
Clear Search sequence regions


  • asian (1)
  • cadmium (4)
  • china (2)
  • DMT1 (1)
  • humans (3)
  • oryza (1)
  • oryza sativa (1)
  • phase (1)
  • rice (8)
  • soil (11)
  • soil pollutants (2)
  • ZIP8 (1)
  • Sizes of these terms reflect their relevance to your search.

    Consumption of rice (Oryza sativa) grain is a major pathway by which humans are exposed to Cd, especially in non-smoking Asian populations. Although the stable isotope signatures of Cd offer a potential tool for tracing its sources, little is known about the isotopic fractionation of Cd across the entire soil-rice-human continuum. Cadmium isotope ratios were determined in field soils, rice grain, and human urine collected from two Cd-contaminated regions in southern China. Additionally, Cd isotopic fractionation in rice plants was investigated using two transgenic plants differing in Cd uptake and accumulation. Analysis of isotope ratios revealed a preferential enrichment of the heavy Cd isotopes from soil to rice grain (δ114/110Cdgrain-soil = +0.40‰) and from grain to urine (δ114/110Cdurine-grain = +0.40‰) in both regions. The first increase was mainly caused by partitioning between the soil solid phase and the soil solution, with heavier Cd preferentially enriching in the soil solution. Within the rice plant, we identified multiple processes that alter the isotope ratio, but the net effect throughout the plant was comparatively small. Cd fractionation in humans is presumably due to the preferential enrichment of heavier Cd isotopes by metal transporters DMT1 and ZIP8 (responsible for the absorption of Cd into body from the foods). These findings provide important insights into the Cd isotopic fractionation through the soil-rice-human continuum and are helpful for tracing the sources of Cd. Copyright © 2020 Elsevier B.V. All rights reserved.

    Citation

    Sheng-Nan Zhang, Yi Gu, Zhen-Li Zhu, Sheng-Hong Hu, Peter M Kopittke, Fang-Jie Zhao, Peng Wang. Stable isotope fractionation of cadmium in the soil-rice-human continuum. The Science of the total environment. 2021 Mar 20;761:143262

    Expand section icon Mesh Tags

    Expand section icon Substances


    PMID: 33218811

    View Full Text