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首页> 外文期刊>Journal of Hazardous Materials >Background values for evaluation of heavy metal contamination in sediments
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Background values for evaluation of heavy metal contamination in sediments

机译：评估沉积物中重金属污染的背景值

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摘要

The contamination of sediments can be evaluated from comparison of the current concentration with the estimated background value. Although it is known that grain size affects background concentrations, there have been difficulties in evaluating this effect. The specific surface area of sediments, which can be calculated from the grain size distribution, is introduced as a property index for correlation of background values. The results show that for sandy-to-sandy silt sediments, the background values of metals are expressed in terms of fines content, which can be correlated with the corresponding specific surface area. However, for silty clay or clayey silt sediments, which would have a high metal retention capacity, the level of the background may be constrained by the relatively low concentrations of metals in seawater. Finally, background levels of Zn, Cu and Pb are presented.
机译：可以通过将当前浓度与估算的背景值进行比较来评估沉积物的污染。尽管已知晶粒尺寸会影响背景浓度，但是很难评估这种效果。可以根据粒度分布计算出沉积物的比表面积作为与背景值相关的特性指标。结果表明，对于沙质至沙质的粉砂沉积物，金属的背景值以细粒含量表示，可以与相应的比表面积相关。但是，对于粉土或黏土淤泥沉积物，它们具有较高的金属保留能力，其背景水平可能受到海水中金属浓度相对较低的限制。最后，介绍了锌，铜和铅的背景水平。

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