Se changed the component of organic chemicals and Cr bioavailability in pak choi rhizosphere soil
文献类型： 外文期刊
作者： Cai, Miaomiao 1 ; Zhao, Xiaohu 1 ; Wang, Xu 2 ; Shi, Guangyu 3 ; Hu, Chengxiao 1 ;
作者机构： 1.Huazhong Agr Univ, Coll Resources & Environm, Hubei Prov Engn Lab New Type Fertilizer, Res Ctr Trace Elements,Hubei Key Lab Soil Environ, Wuhan 430070, Peoples R China
2.Guangdong Acad Agr Sci, Inst Qual Stand & Monitoring Technol Agroprod, Guangzhou 510640, Peoples R China
3.Suzhou Univ Sci & Technol, Coll Environm Sci & Engn, Suzhou 215009, Peoples R China
关键词： Chromium; Selenium; Metabolites; Rhizosphere; Absorption
期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：4.223； 五年影响因子：4.306 ）
ISSN： 0944-1344
年卷期： 2021 年 28 卷 47 期
页码：
收录情况： SCI
摘要： Rhizosphere organic chemicals response and its role on Cr/Se adsorption are of great importance to understand Cr/Se bioavailability in Cr-contaminated soil with the application of Se. In the current work, the processes were carried out using rhizobox experiment (Brassica campestris L. ssp. chinensis Makino). The results showed that in soil contaminated by 200 mg kg(-1) Cr(III), Se(IV) complexed with Cr(III) and carboxylic acid (cis-9,10-Epoxystearic acid, hexadecanedioic acid) reduced Cr(VI) to Cr(III), thus increasing of Cr adsorption, furtherly decreasing Cr bioavailability. While in soil contaminated by 120 mg kg(-1) Cr(VI), Se(VI) competed for adsorption sites with Cr(VI) and salicylic acid activated insoluble Cr(III), thus decreasing Cr adsorption, finally increasing Cr bioavailability. Moreover, with Cr contamination, Se bioavailability in soil was enhanced by the secretion of carboxylic acid, which can reduce Se to lower valent state and compete the adsorption sites and complex with Se oxyanion. These results yielded a better understanding of rhizosphere dynamics regulating by Se application in Cr-contaminated soil. Moreover, the current study supplemented the theoretical basis for beneficial elements application as an environment-friendly resource to facilitate cleaner production in heavy metal contaminated soil.
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