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首页> 外文期刊>Estuarine Coastal and Shelf Science >Saltwater intrusion as potential driver of phosphorus release from limestone bedrock in a coastal aquifer
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Saltwater intrusion as potential driver of phosphorus release from limestone bedrock in a coastal aquifer

机译：盐水入侵是沿海含水层中石灰岩基岩中磷释放的潜在驱动力

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An important but often overlooked consequence of saltwater intrusion is the potential increase of groundwater soluble reactive phosphorus concentrations. The phosphorus sorption dynamics of two limestone rocks of different composition were investigated by simulating seawater intrusion over a wide range of mixing ratios between freshwater and saltwater. Both rocks exhibited a logarithmic loss of sorption efficiency in mixtures containing more than approximately 3 mM Cl- concentration (100 mg Cl-/L; about <1% saltwater). We infer that aquifer solids immersed in freshwater would undergo phosphorus desorption in response to the introduction of this minor amount of seawater. This Cl- concentration is within the range designated as fresh water. Thus we conclude that increased soluble reactive phosphorus availability from saltwater-induced desorption may occur at the ion exchange front, which is actually landward of the saltwater intrusion front as it is commonly defined. Sorption efficiency in our experiments continued to decline as salinity increased, until Cl- concentration reached a second threshold of 50 or 200 mM (1700 or 7700 mg Cl-/L), depending on the rock composition, particularly iron content. Further increase in salinity would produce little increase in groundwater soluble reactive phosphorus concentration. Our results have implications for soluble reactive phosphorus availability in estuaries that receive mixing zone groundwater discharge. (C) 2016 Elsevier Ltd. All rights reserved.
机译：盐水入侵的一个重要但经常被忽视的后果是地下水可溶性反应性磷浓度的潜在增加。通过模拟海水在淡水和盐水混合比大的范围内的入侵，研究了两种不同组成的石灰岩岩石的磷吸附动力学。两种岩石在Cl-浓度超过约3 mM（100 mg Cl- / L；约<1％盐水）的混合物中均表现出对数吸收效率的对数损失。我们推断，由于引入了少量海水，浸泡在淡水中的含水层固体会发生磷解吸。该Cl-浓度在称为淡水的范围内。因此，我们得出结论，由盐水引起的脱附可增加可溶性活性磷的利用率可能发生在离子交换前沿，而离子交换前沿实际上是通常定义的盐水入侵前沿的后方。在我们的实验中，吸附效率随着盐度的增加而持续下降，直到Cl浓度达到第二个阈值50或200 mM（1700或7700 mg Cl- / L），这取决于岩石的成分，特别是铁含量。盐度的进一步增加几乎不会增加地下水中的可溶性反应磷浓度。我们的结果对接受混合区地下水排放的河口中可溶性活性磷的有效性具有影响。 （C）2016 Elsevier Ltd.保留所有权利。

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