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首页> 外文期刊>Environmental toxicology and chemistry >A MODEL OF THE OXIDATION OF IRON AND CADMIUM SULFIDE IN SEDIMENTS
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A MODEL OF THE OXIDATION OF IRON AND CADMIUM SULFIDE IN SEDIMENTS

机译：沉积物中铁和硫化镉的氧化模型

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摘要

A model is presented for the temporal and vertical variation of acid-volatile sulfide (AVS), simultaneously extracted cadmium (SEM_(Cd)), and cadmium interstitial water concentration in sediments. The model is based on the one-dimensional advective-dispersive mass balance equation. Transport by particle and pore-water mixing is considered. The state variables include the components of AVS and SEM_(Cd), namely iron sulfide (FeS) and cadmium sulfide (CdS), and sorbed + pore-water cadmium (Cd_T). In addition, paniculate organic carbon (POC), iron oxyhydroxide, and dissolved oxygen are explicitly modeled. The oxidation, displacement, and partitioning reactions that are sources and sinks of the state variables are included. The model is applied to three experimental data sets. Two of these employed marine sediments with typical organic carbon and AVS concentrations. The third employed a freshwater sediment with a high POC and low AVS. The calibration produced similar partitioning parameters on an organic carbon basis for both sediments. However, the oxidation and partitioning behavior of the FeS in the low AVS freshwater sediment was distinctly different from the high AVS cases. The model successfully reproduces the major features of the experimental data: the progressive decrease in AVS and SEM_(Cd), and an increase in the SEM_(Cd) to AVS ratio in the surface layers. It is less successful in reproducing the pore-water cadmium concentrations.
机译：提出了一个模型，用于酸挥发性硫化物（AVS），同时提取的镉（SEM_（Cd））和沉积物中镉间隙水浓度的时间和垂直变化。该模型基于一维对流-弥散质量平衡方程。考虑通过颗粒和孔隙水混合的运输。状态变量包括AVS和SEM_（Cd）的成分，即硫化铁（FeS）和硫化镉（CdS）以及吸附的+孔隙水镉（Cd_T）。此外，还明确建模了颗粒状有机碳（POC），羟基氧化铁和溶解氧。包括作为状态变量的源和汇的氧化，置换和分配反应。该模型应用于三个实验数据集。其中两个采用典型有机碳和AVS浓度的海洋沉积物。第三个采用了具有高POC和低AVS的淡水沉积物。校准在两种沉积物的有机碳基础上产生了相似的分配参数。然而，低AVS淡水沉积物中FeS的氧化和分配行为与高AVS情况明显不同。该模型成功地再现了实验数据的主要特征：AVS和SEM_（Cd）的逐渐降低，以及表面层中SEM_（Cd）与AVS的比例增加。在重现孔隙水镉浓度方面不太成功。

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