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Prediction of selenium uptake by pak choi in several agricultural soils based on diffusive gradients in thin-films technique and single extraction

文献类型： 外文期刊

作者： Peng, Qin 1 ; Wang, Dan 1 ; Wang, Mengke 1 ; Zhou, Fei 1 ; Yang, Wenxiao 1 ; Liu, Yongxian 3 ; Liang, Dongli 1 ;

作者机构： 1.Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Shaanxi, Peoples R China

2.Chongqing Univ Arts & Sci, Chongqing Key Lab Environm Mat & Remediat Technol, Chongqing 402160, Peoples R China

3.Guangxi Acad Agr Sci, Agr Resource & Environm Res Inst, Nanning 530007, Guangxi, Peoples R China

4.Minist Agr, Key Lab Plant Nutr & Agrienvironm Northwest China, Yangling 712100, Shaanxi, Peoples R China

关键词： Soil properties; Bioavailability; DGT method; Single extraction; Selenite; Selenate

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

ISSN： 0269-7491

年卷期： 2020 年 256 卷

页码：

收录情况： SCI

摘要： The accurate assessment of soil selenium (Se) bioavailability is crucial for Se biofortification in Sedeficient areas and risk assessment in selenosis areas. However, a universally accepted approach to evaluate Se bioavailability in soil is currently lacking. This research investigated Se bioavailability in six soils treated with selenite (Se(IV)) or selenate (Se(VI)) by comparing diffusive gradients in thin-films (DGT) technique and chemical extraction methods through pot experiments. A bioindicator method was used to evaluate Se concentrations in pak choi and compare the results with the Se concentration measured by other methods. Results showed that chemical extraction methods presented different extraction efficiencies for available Se over a range of soil types, and the same extraction method had various extraction efficiencies for different Se species in the same soil. DGT measured Se concentrations (C-DGT-Se) for Se(VI) treatment were 2.3-34.1 times of those for Se(IV) treatment. KH2PO4-K2HPO4 and AB-DTPA extractable Se could predict the bioavailability of soil Se, but they were disturbed by soil properties. HAc extraction was unsuitable for evaluating Se bioavailability in different Se(IV)-treated soils. By contrast, DGT technique was preferable for predicting plant uptake of Se(IV) over chemical extraction methods. Although DGT technique was independent of soil properties, KH2PO4-K2HPO4 extraction provided the best fitting regression equation for Se(VI) when it was dependent on soil organic matter. Thus, KH2PO4-K2HPO4 extraction may be preferred to assess Se(VI) bioavailability in different soil types on a large scale. (C) 2019 Elsevier Ltd. All rights reserved.

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