Abstract The significant geochemical characteristics of the groundwater quality assessment including the impact of monsoon variation of chemical composition of groundwater were determined. 44 groundwater samples were collected in the Arani Taluk of South India and all important physico-chemical parameters including trace metals were determined to characterize and evaluate the hydrogeochemical nature and water quality. In order to evaluate the geochemical characteristics, the order of abundance of the ions in the groundwater is determined for both seasons. In this study, Gibb’s diagram is used to evaluate the mechanism responsible for the change in the chemical composition of groundwater. The unique characteristic of the groundwater has been brought out using the inter-relationship among the principal ions. Utilizing the application of 1 : 1 equiline diagrams, hydrochemical features of the physico-chemical parameters pertaining to the groundwater were evaluated. Reverse ion-exchange study and Chloro-alkaline indices were carried out to evaluate the occurrence of ion-exchange/reverse ion-exchange in the groundwater of the region. The suitability of groundwater to irrigation is studied in detail using various ratios’ including Residual sodium carbonate, SAR and Wilcox and USSL diagrams. The results clearly illustrates that the groundwater of the study area is suitable for irrigation. Water quality studies with respect to trace metals have been carried out and the results show that the water has higher concentration of heavy metals and the results of Heavy metal pollution index also substantiates the fact and many groundwater samples found to show higher values than the allowed limit with respect to heavy metal contamination.

中文翻译：

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印度南部泰米尔纳德邦 Arani Taluk 地下水地球化学特征和水质评价

摘要 确定了地下水质量评价的重要地球化学特征，包括季风变化对地下水化学成分的影响。在南印度的 Arani Taluk 采集了 44 个地下水样品，并确定了包括痕量金属在内的所有重要物理化学参数，以表征和评估水文地球化学性质和水质。为了评估地球化学特征，确定了两个季节地下水中离子的丰度顺序。在本研究中，吉布斯图用于评估地下水化学成分变化的机制。利用主要离子之间的相互关系，展现了地下水的独特特性。利用 1 的应用：1 等值线图，评估了与地下水有关的理化参数的水化学特征。进行了反离子交换研究和氯碱指数，以评估该地区地下水中离子交换/反离子交换的发生。使用各种比率（包括残留碳酸钠、SAR 和 Wilcox 以及 USSL 图）详细研究了地下水对灌溉的适用性。结果清楚地表明研究区地下水适宜灌溉。