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Effects of sludge on heavy metals release from peppermint-planted soils during time as assessed by DGT technique
Archives of Agronomy and Soil Science ( IF 2.4 ) Pub Date : 2020-08-12 , DOI: 10.1080/03650340.2020.1798000
Amir Mohseni 1 , Adel Reyhanitabar 1 , Nosratollah Najafi 1 , Shahin Oustan 1 , Kambiz Bazargan 2
Affiliation  

ABSTRACT

The desorption kinetics of Cd, Pb, and Zn was investigated as a function of sewage sludge amount (0, 10, and 30 g kg−1), incubation time length (30 and 120 days) and plant cultivation (Mentha pipertia L.) using diffusive gradient in thin-film (DGT) technique. Kinetic parameters result of studied metals suggested that an increase in desorption rate constant (K−1), distribution coefficient (Kd), and resupply (R) values as well as a decrease in response time (Tc) over time in planted soils treated with 30 g kg−1 sewage sludge, which then resulted in a significant increase in plant metals concentrations. In 10 g kg−1 sewage sludge treated soils, a reverse trend was observed for the parameters over time (except for Kd values of Cd). Statistical analyses showed that Zn and Pb desorption rates were more influenced by dissolved organic carbon (DOC) compared to pH. For Cd, there was a significant agreement between K−1 and clay content. It is concluded that unlike Zn and Pb, the decreased R value of Cd that was reflected by the increased Tc and the reduced K−1 after extended incubation period may be the main factor limiting the Cd availability.



中文翻译:

DGT技术评估污泥对薄荷种植土壤中重金属释放的影响

摘要

研究了 Cd、Pb 和 Zn 的解吸动力学与污水污泥量(0、10和 30 g kg -1)、孵育时间长度(30 和 120 天)和植物栽培 ( Mentha pipetia L.) 的函数关系。使用薄膜扩散梯度 (DGT) 技术。研究金属的动力学参数结果表明,随着时间的推移,种植土壤中解吸速率常数 (K -1 )、分配系数 (K d ) 和补给 (R) 值增加,响应时间 (T c ) 随时间减少用 30 g kg -1污水污泥处理,然后导致植物金属浓度显着增加。在 10 克公斤-1在污水污泥处理的土壤中,随着时间的推移,观察到参数的反向趋势(除了Cd 的K d值)。统计分析表明,与 pH 值相比,溶解有机碳 (DOC) 对 Zn 和 Pb 解吸速率的影响更大。对于 Cd,K -1和粘土含量之间存在显着的一致性。结论是,与Zn和Pb不同,延长潜伏期后由T c增加和K -1减少所反映的Cd的R值降低可能是限制Cd可用性的主要因素。

更新日期:2020-08-12
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