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DGT和动力学分析在自然丰富的土中区分了Se和Cd的生物利用性

Chao Zhang¹, Dong-Xing Guan¹, Paul N Williams²

¹Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China.

|November 22, 2024

概括

(Se) 和 (Cd) 在土中的生物可用性是使用薄膜扩散梯度 (DGT) 进行评估的. DGT有效地预测了米的Se和Cd积累,有助于安全的Se缩米生产.

科学领域:

环境科学环境科学
土壤科学土壤科学
农业科学农业科学

背景情况:

自然富含 (Se) 的土壤往往具有较高的 (Cd) 含量.
这对Se缩大米的安全生产构成了挑战.

研究的目的:

用薄膜 (DGT) 和土壤中DGT诱导的流量 (DIFS) 模型来确定米土壤中的Se和Cd生物利用率.
为了研究米中的Se和Cd脱吸动力学和积累模式.

主要方法:

利用DGT和DIFS模型评估中国广西65个现场场的Se和Cd生物可用性.
分析了Se丰富的地和非地土壤的结合根球和谷物样本.
在大米中检查了溶解动力学和积累模式.

主要成果:

尽管在地土壤中总体Se和Cd较高,但生物利用性受到土壤特性 (pH,有机物质,Fe,Mn,Ca) 的限制,导致类似的谷物积累.
Se的补充速度是Cd的75.4倍,但Cd具有更大的可变池 (83.2倍),表明更大的补给能力.
由DGT衍生出的性Se:Cd摩尔比率与谷物Cd有很强的相关性,显示积累率在0.7以上下降,稳定率在20以上.

结论:

DGT和动力学分析是有效的评估Se和Cd在高背景的土中的生物利用性.
调查结果为在米生产中平衡Se强化和Cd降低风险提供了洞察力.
DGT测量显示,与传统方法相比,与谷物Se和Cd的相关性更强.

关键词:

在DIFS模型中,绝吸动力学绝吸动力学高地背景的石灰岩土壤.Se:Cd 的摩尔比是什么?富含的土壤富含的土壤土壤供应补充土壤供应补充

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