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Comparison of the impacts of the experimental parameters and soil properties on the prediction of the soil sorption of Cd and Pb
Geoderma ( IF 6.1 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.geoderma.2020.114538
Yukari Imoto , Tetsuo Yasutaka

Abstract The sorption and desorption of heavy metals in soil are important processes influencing their transport through soil and their ultimate fates. Many attempts have been made to predict the solid–liquid portioning coefficients, often required for modeling the transport and fates of heavy metals in a soil system. In the conventional approach, several soil properties, including pH and cation exchange capacity, are used as predictors to estimate sorption constants. While there is empirical evidence that the environmental and solution parameters, often varying with the experimental conditions of the sorption test, influence the measured soil sorption, previous studies have not considered the effects of these experimental parameters on the reported results thoroughly. Disregarding the experimental conditions may result in biased predictions of the sorption constants, resulting in inaccurate risk assessments. Herein, multiple linear regression models are developed to predict the Freundlich equation coefficients of Cd and Pb based on both the soil properties and experimental conditions as explanatory variables. Results show that the proposed model provided better performance than the conventional techniques that only consider the soil properties. It is demonstrated that the impacts of certain experimental parameters, such as liquid–solid ratio and background electrolyte concentration in solution, on the sorption constants were comparable in magnitude to the effects of the soil properties. These findings indicate that different experimental conditions should be accounted for when comparing sorption constants determined in different studies. The proposed approach could be applicable to the estimation of soil sorption constants with range of environmental and solution parameters.

中文翻译:

实验参数和土壤性质对土壤Cd和Pb吸附预测的影响比较

摘要 重金属在土壤中的吸附和解吸是影响重金属在土壤中运输和最终归宿的重要过程。已经进行了许多尝试来预测固液分配系数,通常需要对土壤系统中重金属的迁移和归宿进行建模。在传统方法中,几种土壤特性,包括 pH 值和阳离子交换容量,被用作预测吸附常数的预测因子。虽然有经验证据表明,环境和溶液参数通常随吸附测试的实验条件而变化,会影响测量的土壤吸附,但以前的研究并未彻底考虑这些实验参数对报告结果的影响。忽视实验条件可能会导致对吸附常数的预测有偏差,从而导致风险评估不准确。在此,基于土壤性质和实验条件作为解释变量,开发了多元线性回归模型来预测 Cd 和 Pb 的 Freundlich 方程系数。结果表明,与仅考虑土壤特性的传统技术相比,所提出的模型提供了更好的性能。结果表明,某些实验参数(例如溶液中的液固比和背景电解质浓度)对吸附常数的影响在大小上与土壤性质的影响相当。这些发现表明,在比较不同研究中确定的吸附常数时,应考虑不同的实验条件。所提出的方法可适用于在环境和溶液参数范围内估算土壤吸附常数。
更新日期:2020-10-01
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