4.7 Article

Mercury fractionation, bioavailability, and the major factors predicting its transfer and accumulation in soil-wheat systems

Journal

SCIENCE OF THE TOTAL ENVIRONMENT
Volume 847, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.scitotenv.2022.157432

Keywords

Wheat; Soil physio-chemical properties; Mercury fractionation; Prediction model

Funding

  1. National Key Research & Development Program of China
  2. Funds for China Agriculture Research System
  3. Agricultural Science and Technology Innovation Program of the Chinese Academy of Agricultural Sciences (2021-2025)
  4. [2016YFD0800401]

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The study found that different forms of soil mercury can affect the absorption and accumulation of mercury in wheat, with crystalline aluminum and crystalline manganese significantly impacting the transfer of mercury.
Soil mercury (Hg) and its bioaccumulation in food crops have attracted widespread concerns globally due to its harmful effects on biota. However, soil mercury fractionation, bioavailability, and the major factors predicting its transfer and ac-cumulation in soil-wheat-systems have not been thoroughly explored. Twenty-one (21) soil samples collected throughout China with a wide spectrum of physico-chemical characteristics were contaminated with HgCl2 and winter wheat (Triticum aestivum L.) was grown on the soils in a greenhouse pot-culture experiment for 180 days. A four-step sequential extraction was used segregating soil Hg into water-soluble (F1, 0.21 %), exchangeable (F2, 0.07 %), organically bound (F3, 16.40 %), and residual fractions (F4, 83.32 %). Step-wise multiple linear regression (SMLR) and path analysis (PA) were used to develop a prediction model and identify the major controlling factors of soil-wheat Hg transference. The SMLR results revealed that wheat Hg in leaves, husk, and grain was positively correlated with soil total and avail-able Hg, and crystalline manganese (Cryst-Mn), while negatively correlated with soil pH, amorphous manganese (Amor-Mn) and crystalline aluminium (Cryst-Al). Bioconcentration factor (BCF) values were significantly higher in acidic

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