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在洪水条件下在各种土壤中预测As和Cd溶解

Jingwen Ge¹, Song Wu², Haotian Wu¹

¹State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing, China.

The Science of the total environment

|July 22, 2024

概括

预测土壤中的 (As) 和 (Cd) 溶解是具有挑战性的. 一个新的铁比率 (Fe(II) /Fe_tot) 有效地预测了洪水下A的溶解度,其性能优于溶解的铁.

科学领域:

环境化学环境化学
土壤科学土壤科学
地质化学地质化学

背景情况:

在洪水排水过程中,土壤中 (As) 和 (Cd) 的流动性至关重要,但很难预测.
现有的方法难以准确预测不同土壤类型中As和Cd溶解的情况.

研究的目的:

确定控制无氧土壤化过程中As和Cd溶解的关键因素和途径.
开发一个可靠的指数,以评估在洪水条件下A的溶解潜力.

主要方法:

在60天的无氧化期间,在8种不同的土壤中全面监测As和Cd溶解参数.
冗余分析 (RDA) 和结构方程建模 (SEM) 的应用以确定控制因素.
评价pH值,溶解Fe (II) 和一种新的铁比率 (Fe (II) /Fe_tot) 作为As溶解的预测因素.

主要成果:

土壤pH值是控制Cd溶解的主要因素 (90.5%).
溶解的Fe (II) 和5M HCl可提取的Fe (II) 共同解释了只有50.6%的As溶解.
新的Fe (II) /Fe_tot比率显著改善了As溶解的预测 (R2 = 0.824,p < 0.001).

结论:

总铁 (Fe ((II) /Fe_tot) 的降解程度是洪水期间As降解和溶解的关键决定因素.
溶解Fe (II) 对土壤特性过于敏感,无法作为一个稳定的As溶解指标.
建议Fe (II) /Fe_tot比率作为一个优秀的指数,用于定量评估被洪水淹没的土壤中的As可溶性潜力.

关键词:

没有氧气的厌氧.亚是一种.解散解散解散解散预测预测预测浸水土壤浸水土壤.

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