This study is carried out to assess the water pollution in Köyceğiz-Dalyan Coastal Lagoon Watershed located near the Mediterranean Sea in Muğla province, SW Turkey, by using heavy metal pollution index (HPI). A total of 30 samples were collected from the lakes, streams, groundwaters, the subaqueous hot and cold springs, and on-land hot springs, and Cr, Fe, As, Sb, and Pb concentrations were determined. Elevated concentrations of Fe, As, and Pb were detected in most of the samples; the sources of which are either the natural or anthropogenic discharge of the geothermal springs and seawater mixing. As and Pb concentrations in some locations are found to exceed both acute and chronic exposure criteria for aquatic life, posing a threat to the species hosted by these environments. To determine the magnitude of pollution, HPI calculations were carried out. The average and maximum HPI values for the cold waters are 297.1 and 1162.9, respectively, both of which are higher than the critical pollution index value. The highest HPI values are observed in samples taken from the Dalyan Channel and Alagöl Lake. In general, pollution levels increase from north to south, reaching the maximum value at the outlet point, due to the increased contribution from thermal water discharge and mixing with seawater.

中文翻译：

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土耳其西南科伊西斯-达利安沿海泻湖流域（穆拉）的重金属污染评估

这项研究是通过使用重金属污染指数（HPI）来评估位于土耳其西南部穆拉省地中海附近的科伊西斯-达利安海岸泻湖流域的水污染的。从湖泊，溪流，地下水，水下温泉和冷泉以及陆上温泉中总共采集了30个样品，并测定了Cr，Fe，As，Sb和Pb的浓度。在大多数样品中，Fe，As和Pb的浓度升高。其来源是地热温泉的自然排放或人为排放以及海水混合。在某些地方，砷和铅的浓度超过了水生生物急性和慢性暴露标准，这对这些环境中的物种构成了威胁。为了确定污染的程度，进行HPI计算。冷水的平均HPI值和最大HPI值分别为297.1和1162.9，均高于临界污染指数值。从Dalyan海峡和Alagöl湖采集的样品中观察到最高的HPI值。通常，由于热量排放和海水混合的贡献增加，污染水平从北向南增加，在出口处达到最大值。