The effect of chelating agents on iron plaques and arsenic accumulation in duckweed (Lemna minor)

被引：0

作者：

Yang, Gui-Li ^{[1
]}

Yang, Ming-Xing ^{[2
]}

Lv, Shi-Ming ^{[3
]}

Tan, Ai-Juan ^{[1
]}

机构：

[1] College of Life Sciences, Guizhou University, Guiyang,550025, China

[2] Institute of Geochemistry, Chinese Academy of Sciences, Guiyang,550081, China

[3] College of Animal Science, Guizhou University, Guiyang,50025, China

来源：

Journal of Hazardous Materials | 2021年 / 419卷

基金：

中国国家自然科学基金;

关键词：

Water pollution - Desorption - Bioremediation - Iron - Biochemistry;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Iron plaques have been found to limit the phytoremediation efficiency by reducing iron solubility, while chelating agents can increase the bioavailability of iron from Fe plaques to numerous terrestrial plants. However, the effects of chelating agents on Fe plaques along the As accumulation in aquatic plants remain unknown. In this study, the effects of five chelating agents (EDTA, DTPA, NTA, GLDA, and CA) on the As (As(III) or As(V)), phosphate, and iron uptake by iron plaques and duckweed (Lemna minor) were examined. The results showed that the chelating agents increased the As accumulation in L. minor plants by desorbing and mobilizing As from Fe plaques. The desorption rates of As(V) (As(III)) from the Fe plaques by the chelating agents were 5.26–8.77% (8.70–15.02%), and the plants/DCB extract ratios of As(V) (As(III)) increased from 2.63 ± 0.13 (1.97 ± 0.06) to the peak value of 3.38 ± 0.21 (2.70 ± 0.14) upon adding chelating agents. Besides, the addition of chelating agents increased the uptake of P and Fe by L. minor plants. This work provides a theoretical basis for the remediation of As-contaminated waters by duckweed with the help of chelating agents. © 2021 Elsevier B.V.

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