4.7 Article

Se changed the component of organic chemicals and Cr bioavailability in pak choi rhizosphere soil

期刊

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 28, 期 47, 页码 67331-67342

出版社

SPRINGER HEIDELBERG
DOI: 10.1007/s11356-021-13465-w

关键词

Chromium; Selenium; Metabolites; Rhizosphere; Absorption

资金

  1. National Natural Science Foundation of China [41571321, 41807142]
  2. Opening Project of Key Laboratory of Testing and Evaluation for Agro-product Safety and Quality, Ministry of Agriculture and Rural Affairs [NK201702]
  3. Fundamental Research Funds for the Central Universities [2662018JC057]
  4. Hubei Provincial students' innovation and entrepreneurship training program [S201910504016]

向作者/读者索取更多资源

The study found that the interaction between selenium and cadmium in cadmium-contaminated soil can affect the bioavailability of cadmium, impacting the adsorption capacity of cadmium through complex chemical reactions. Additionally, the release of carboxylic acid in the soil can enhance the bioavailability of selenium, playing a role in competing for adsorption sites and complexing with selenite ions.
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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