Faculty of Earth Sciences, Shahrood University of Technology, Shahrood, Iran.
Environ Geochem Health. 2023 Jun;45(6):4025-4042. doi: 10.1007/s10653-023-01482-2. Epub 2023 Jan 12.
Groundwater is a finite resource in Davarzan region which is located between the ophiolite complex mountain in the north and salty playa at the south. The water samples were analyzed to assess the origin of groundwater pollution and explain links between the disturbed heavy metals composition of the earth's surface and the human health risks. The main heavy metal pollutants in the groundwater are Cr, Fe, As and Pb ions. In general, the groundwater salinity and some elements such as Cr and As are increased along with surface topography and groundwater flow directions from the northern ophiolite highlands recharge area to the adjacent desert discharging zone in the south. Despite the ophiolite complexes being the most enriched in Cr element, the lowest Cr concentration in the groundwater was measured near the ophiolite area, which is in the range of its discharged springs. Based on the groundwater conceptual pollution model, bedrock geochemistry controls the composition of soil and hence that of groundwater. The Cr samples show a direct relation with the EC value indicating that intrusion of salinity from the salt pan is probably another reason for the increased Cr concentration. The results of health risk assessment indicated that the groundwater suffered from significant contamination and if used for long-term without pre-treatment may pose serious health risks to human population via drinking water and irrigation of agricultural fields. This is the first attempt to apply hydrogeological setting along with the source of pollution and its health risk in a desert-ophiolitic area.
地下水是达瓦赞地区的一种有限资源，该地区位于北部蛇绿岩杂岩山脉和南部盐滩之间。对水样进行了分析，以评估地下水污染的来源，并解释地球表面受干扰的重金属组成与人类健康风险之间的联系。地下水的主要重金属污染物是 Cr、Fe、As 和 Pb 离子。一般来说，地下水的盐分和 Cr、As 等一些元素的浓度随着地表地形和地下水流动方向从北部蛇绿岩高地补给区向南部相邻沙漠排泄区而增加。尽管蛇绿岩杂岩是 Cr 元素最丰富的地区，但在蛇绿岩地区附近测量到的地下水中 Cr 浓度最低，这是其排泄泉的范围内。根据地下水概念污染模型，基岩地球化学控制着土壤的组成，进而控制着地下水的组成。Cr 样本与 EC 值呈直接关系，表明来自盐滩的盐分入侵可能是 Cr 浓度增加的另一个原因。健康风险评估的结果表明，地下水受到了严重的污染，如果未经预处理长期使用，可能会通过饮用水和灌溉农田对人口健康造成严重威胁。这是首次尝试在沙漠蛇绿岩地区应用水文地质背景、污染源及其健康风险。
