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首页> 外文期刊>Journal of soil & sediments >Impacts of salinity level and flood irrigation on Cd mobility through a Cd-contaminated soil, Thailand: experimental and modeling techniques
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Impacts of salinity level and flood irrigation on Cd mobility through a Cd-contaminated soil, Thailand: experimental and modeling techniques

机译：盐度和洪水灌溉对通过镉污染的土壤中镉迁移率的影响，泰国：实验和建模技术

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Purpose The objective of this research was to investigate the effects of salinity levels and pore water velocity (PV) on the sorption, fate, and transport of Cd through contaminated soil in low-lying areas along Mae Tao Creek, Tak Province, Thailand.Materials and methods Soil samples collected from a depth of 15 cm from the rice field were air-dried, ground, and sieved through a 2-mm sieve prior to the experiments. Batch sorption/desorption experiments were conducted under three salinity levels, 1, 10, and 100 mM, using CaCl2 as salt. The six columns for the Cd transport experiments were performed with low and high pore water velocities (2 and 9 cm/h) and salinity levels of 1, 10, and 100 mM. Effects on Cd rate-limited sorption and transport behavior were evaluated using the sorption isotherms, PHREEQC geochemical modeling, and mathematical model, HYDRUS-1D.Results and discussion For the batch experiments, the Freundlich isotherm was found to be the best sorption isotherm to explain the Cd sorption (R-2 0.93, p value 0.05). The Langmuir two-site model (TSM) well explained the breakthrough curves of the column experiments with Langmuir sorption coefficient (K-L) ranging from 0.09 to 4.03 l/g. Salinity levels appeared to significantly increase the equilibrium fraction site (f) and first-order rate constant (alpha) on Cd sorption and transport over the salinity levels of 10-100 mM due to the competitive effect and the dominant species of Cd.Conclusions Solute transport parameters in the TSM can be used as an efficient decision support tool to predict Cd movement through contaminated sandy loam soils under a flood irrigation area.
机译：目的这项研究的目的是研究盐度水平和孔隙水速度（PV）对泰国来兴府湄涛溪低洼地区镉通过污染土壤的吸附，结实和运输的影响。方法在实验前，将距离稻田15厘米深的土壤样品风干，磨碎并过2毫米筛。使用CaCl2作为盐，在三种盐度水平（1、10和100 mM）下进行分批吸附/解吸实验。在低和高孔隙水速度（2和9 cm / h），盐度分别为1、10和100 mM的条件下，进行了六根用于Cd传输实验的色谱柱。使用吸附等温线，PHREEQC地球化学模型和数学模型HYDRUS-1D评估了对Cd限速吸附和迁移行为的影响。 Cd吸附（R-2> 0.93，p值<0.05）。 Langmuir两点模型（TSM）很好地解释了Langmuir吸附系数（K-L）为0.09至4.03 l / g的色谱柱实验的突破曲线。在10-100 mM的盐度水平上，由于竞争作用和C​​d的主要种类，盐度水平似乎显着增加了Cd吸附和迁移的平衡分数位点（f）和一级速率常数（alpha）。 TSM中的运移参数可以用作预测Cd在洪水灌溉区下通过受污染的沙壤土移动的有效决策支持工具。

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