A novel multi-reaction model for kinetics of Zn release from soils: Roles of soil binding sites
A novel multi-reaction model for kinetics of Zn release from soils: Roles of soil binding sites
复制标题
土壤中锌释放动力学的新型多反应模型：土壤结合位点的作用
DOI：
10.1016/j.jcis.2017.12.006
复制
发表时间：
2018
影响因子：
9.9
通讯作者：
Sparks Donald L.
中科院分区：
文献类型：
--
作者：
Peng Lanfang;Shi Zhenqing;Wang Pei;Li Wei;Lin Zhang;Dang Zhi;Sparks Donald L.
土壤中Zn的释放动力学是影响Zn在土壤中的去向和生物有效性的关键过程，而Zn释放过程中的多个土壤结合位点和多个土壤结合反应使其复杂化。在这项研究中，我们建立了一个新的定量模型的动态Zn形态在土壤中的Zn释放过程中，通过整合的机制平衡模型WHAM 7和分子水平的研究Zn形态与X射线吸收光谱（XAS）。动力学模型具体考虑了锌与土壤有机质（SOM），铁（氢）氧化物，粘土矿物和锌沉淀物的溶解反应。通过批处理和补施试验研究了土壤中Zn的释放动力学，并利用XAS技术对土壤Zn的形态进行了分析。总体而言，该模型描述的实验数据合理，最小的模型拟合参数。我们定量评估了不同时间尺度和反应条件下，不同土壤组分和有机质结合位点中Zn形态的动态变化。我们的动力学模型提供了一个定量的框架来预测土壤环境中锌的动态行为。
The kinetics of Zn release from soil is a key process affecting the fate and bioavailability of Zn in soil, which may be complicated by multiple soil binding sites and reactions during the Zn release process. In this study, we developed a novel quantitative model for the dynamic Zn speciation in soil during the Zn release process, by integrating the mechanistic equilibrium model WHAM 7 and molecular level investigation of Zn speciation with X-ray absorption spectroscopy (XAS). The kinetics model specifically considered Zn reactions with soil organic matter (SOM), iron (hydr)oxides, and clay minerals, and dissolution of Zn precipitates. Batch and replenishment experiments were conducted to study kinetics of Zn release from laboratory-spiked soils and XAS was employed to identify soil Zn speciation. Overall, the model described the experimental data reasonably well with minimal model fitting parameters. We quantitatively assessed the dynamic changes of Zn speciation in different soil components and SOM binding sites at various time scales and reaction conditions. Our kinetics model provides a quantitative framework for predicting the dynamic behavior of Zn in soil environments.