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

文献类型： 外文期刊

第一作者： Hussain, Sajjad

作者： Hussain, Sajjad;Yang, Jianjun;Ullah, Subhan;Zandi, Peiman;Xia, Xing;Zhang, Liandong;Hussain, Sajjad;Hussain, Imran;Sattar, Abdul;Rahman, Shafeeq Ur;Rahman, Shafeeq Ur;Hussain, Jamshad;Zandi, Peiman

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关键词： Wheat; Soil physio-chemical properties; Mercury fractionation; Prediction model

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：10.753； 五年影响因子：10.237 ）

ISSN： 0048-9697

年卷期： 2022 年 847 卷

页码：

收录情况： SCI

摘要： 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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