Influence of sulfur fertilization on CuO nanoparticles migration and transformation in soil pore water from the rice (Oryza sativa L.) rhizosphere

文献类型： 外文期刊

第一作者： Sun, Lijuan

作者： Sun, Lijuan;Xue, Yong;Sun, Lijuan;Shi, Jiyan;Peng, Cheng;Xu, Chen

作者机构：

关键词： CuO NPs; Sulfur fertilizer; Migration; Colloids; Rice rhizosphere region

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 257 卷

页码：

收录情况： SCI

摘要： The biogeochemical cycling of sulfur in soil is closely associated with the mobility and bioavailability of heavy metals; however the influence of sulfur on the behavior of metal-based nanoparticles has not yet been studied. The influence of S fertilizer (S-0 and Na2SO4) applied in paddy soils on CuO NPs behavior in soil pore water was explored in the present study. Synchrotron-based techniques were applied to investigate the migration and speciation transformation of CuO NPs in soil pore water colloids. The application of sulfur fertilizer increased the zeta potential of soil colloids from the rice rhizosphere region and reduced the size of the colloids. Sulfur fertilization decreased the concentration of Cu in soil pore water in the rice rhizosphere region. S-0 fertilizer reduced the Cu concentration in soil colloids (by 55.8% -73.5%), while Na2SO4 increased the Cu concentration in soil colloids (by 173.8%-265.1%). Sulfur fertilization changed the spatial distribution of Fe3+ and Cu2+ in colloids, making these ions more likely to be aggregated on the edges of soil colloids. Speciation transformation of CuO NPs happened during the process of migration. The main Cu speciation in the soil colloids were CuO NPs, Cu-Cysteine, Cu2S and Cu-Citrate. Sulfur fertilization increased the proportion of Cu2S (by 40.5%) in soil pore water colloids from the rice rhizosphere region, while the proportion of CuO NPs was reduced (by 18.4%). Sulfur fertilization changed the morphology and elementary composition of colloids in soil pore water, thus influencing the migration of CuO NPs in the soil column through soil colloids. (C) 2019 Elsevier Ltd. All rights reserved.

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