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一小部分的海水入侵显著增加了沿海田里大米的Cd吸收

Wenting Chi¹, Guojun Chen², Shiwen Hu²

¹Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, PR China; National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.

Journal of hazardous materials

|July 8, 2023

概括

河口田的高盐度显著增加了大米粒中的 (Cd) 积累. 这是由于Cd的可用性和摄入量增加造成的,这对食品安全构成风险.

科学领域:

环境科学环境科学
农业科学农业科学
土壤化学土壤化学

背景情况:

河口的田面临海水的入侵,引发了人们对盐度对大米的影响的担忧.
在不同盐度下,大米粒中的 (Cd) 积累情况尚不清楚.

研究的目的:

调查不同盐度水平对Cd在米粒中的可用性和积累的影响.
在河口条件下,阐明Cd在水中积累背后的机制.

主要方法:

在受控的洪水排水周期和盐度水平 (0.2‰,0.6‰,1.8‰) 下种植大米的实验.
对土壤Cd分数和大米根和谷物的Cd吸收进行分析.
建立一个动力模型来评估Cd转换.

主要成果:

在1.8‰盐度下,的可用性显著增加,特别是在土壤排水期间,由于阴离子竞争和离子复合 (CdCl_n^2-n).
从有机物和Fe-Mn氧化物中释放的Cd在高盐度下得到增强.
大米根和谷物在1.8‰盐度时显示出显著更高的Cd含量,这与Cd可用性增加和Cd吸收的基因上调有关.

结论:

河口环境中的高盐度是大米粒中Cd积累的关键驱动因素.
了解这些机制对于确保河口地区大米的食品安全至关重要.

关键词:

是的组成部分.氧化还原剂的使用方法大米大米大米大米大米盐分盐分盐分盐分盐分海水的入侵海水的入侵

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