EDTA对轮叶黑藻体系中砷迁移转化的影响

Effects of EDTA on the Migration and Transformation of Arsenic in the System of Hydrilla verticillata

钟彪 ¹黄中情 ¹宋梦萍 ¹曾绍宇 ¹刘雯清 ¹何发涛 ¹杨常亮²

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作者信息

1. 云南大学国际河流与生态安全研究院,云南昆明 650091
2. 云南大学生态与环境学院,云南昆明 650091
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摘要

该研究以砷污染的湖泊沉积物和轮叶黑藻为研究对象,探讨了乙二胺四乙酸(EDTA)对轮叶黑藻体系中砷迁移转化的影响机制.结果表明:0.5 mg/L EDTA显著促进沉积物中的砷释放到上覆水中.0.5和5.8 mg/L EDTA增强了轮叶黑藻对砷的富集能力,EDTA促进植物将砷酸盐[As(Ⅴ)]还原为亚砷酸盐[As(Ⅲ)],提高了植物体内砷的甲基化作用,降低了砷的毒性.5.8mg/LEDTA介导下,植物保持较高的光合色素、蛋白质和丙二醛含量,以及产生大量的超氧化物歧化酶、过氧化氢酶和还原型谷胱甘肽酶来抵抗砷的胁迫.

Abstract

This study focused on arsenic-contaminated lake sediments and Hydrilla verticillata obenifera to investigate the effects of ethylenediaminetetraacetic acid(EDTA)on arsenic migration and transformation in the Hydrilla verticillata system.The results showed that 0.5 mg/L EDTA significantly promoted the release of arsenic from sediments into overlying water.0.5 and 5.8 mg/L EDTA not only enhanced the enrichment of arsenic by Hydrilla verticillata,but also promoted the reduction of arsenate[As(Ⅴ)]to arsenite[As(Ⅲ)]by plants,and the methylation of arsenic to reduce arsenic toxicity.EDTA allowed plants to maintain high levels of photosynthetic pigments.5.8 mg/L EDTA promoted plants to maintain high levels of photo-synthetic pigments,proteins,and malondialdehyde,as well as large amounts of superoxide dismutase,catalase,and reduced glutathione in plants to resist arsenic stress.

关键词

砷/乙二胺四乙酸/轮叶黑藻/迁移与转化

Key words

arsenic/ethylenediaminetetraacetic acid/Hydrilla verticillata/migration and conversion

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基金项目

国家自然科学基金(51168047)

出版年

2024

环境科学与技术

湖北省环境科学研究院

环境科学与技术

CSTPCD北大核心

影响因子：0.943

ISSN：1003-6504

参考文献量8

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