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首页> 外文期刊>Autonomic neuroscience: basic & clinical >Modeling trace metal partitioning and speciation at the sediment-water interface using a chemical equilibrium model
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Modeling trace metal partitioning and speciation at the sediment-water interface using a chemical equilibrium model

机译：使用化学平衡模型建模痕迹金属分配和沉积物 - 水界面的形态

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Isotherm adsorption experiments for Pb, Cd and Zn were carried out with coastal sediments from China under oxic sediment-water conditions. The conditional equilibrium constants (K-ads) determined from the adsorption isotherms were found to be most strongly correlated with Mn oxides (MnOx) for Pb and Cd, and with particulate organic carbon (POC) for Zn. MnOx and POC were then used as the surrogate metal-binding phases in a sediment-water chemical equilibrium model (SCEM). The apparent equilibrium constants (beta(sed, Me*)) of the SCEM were determined to be 10(9.56 +/- 0.41) for Pb (n = 9), 10(5.25 +/- 0.34) for Zn (n = 7), and 10(6.51 +/- 0.29) for Cd (n = 7). The SCEM was then used to predict the free metal ion activities ({Me2+}) in seawaters of Jinzhou Bay, China. The SCEM-predicted {Me2+} compared well with the measured ones for Pb and Zn in seawater. However, the predicted {Cd2+} was higher than measured, which may reflect a detoxification mechanism of marine organisms in Jinzhou Bay seawater. Overall, a model of this kind can be highly useful for predicting {Men+} in the overlying waters based on the surface sediment chemistry, and can contribute to the development of sediment quality guidelines by linking them with the corresponding water quality criteria.
机译：在氧化沉积物水条件下，通过来自中国的沿海沉积物进行Pb，Cd和Zn的等温性吸附试验。发现由吸附等温线测定的条件平衡常数（K-ADS）与Pb和Cd的Mn氧化物（MNOX）和Zn的颗粒有机碳（PoC）最强烈地相关。然后使用MNOX和POC作为沉积物 - 水化学平衡模型（SCEM）中的替代金属结合相。 SCEM的表观平衡常数（β（SED，ME *））测定为PB（n = 9）的10（9.56 +/- 0.41），10（5.25 +/- 0.34）用于Zn（n = 7 CD（n = 7）的10（6.51 +/- 0.29）。然后使用SCEM来预测锦州湾锦州湾海水中的空闲金属离子活性（{ME2 +}）。 SCEM预测的{ME2 +}与海水中的PB和Zn的测量值相比。然而，预测的{CD2 +}高于测量，这可能反映了锦州海湾海水海洋生物的解毒机制。总的来说，这种模型对于基于地表沉积物化学来预测覆盖水中的{MEN +}可以非常有用，并且可以通过将它们与相应的水质标准连接来促进沉积物质量指南的发展。

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