Applied Chemistry Research Centre, PCSIR Laboratories Complex, Off University Road, Karachi 75280, Pakistan.
Water Environ Res. 2013 Jul;85(7):579-86. doi: 10.2175/106143013x13698672321382.
The role of seawater dilution, along with other water-quality components, has been studied to determine the causes of spatial distribution of high fluoride concentrations in the groundwater of the Diplo sub-district, Thar Desert, Pakistan. Fluoride ion concentration ranges of up to 7.60 mg/L were discovered, with mean and median values of 1.66 and 1.34 mg/L, respectively. Estimates based on the total dissolved solid (TDS) ratio show the impact of seawater intrusion at a percentage of around 8.05% in the groundwater. The major ion chemistry of water in the central diamond shape of the Piper diagram precisely demarcates the phenomenon of the intrusion of seawater into the study area. The plots of Na+K vs. Ca+Mg (meq/L) and log C1 (mg/L) vs. log Ca+Mg/Na+K (meq/L) indicate a mixing of freshwater with seawater. The molar Na/Na+Cl and Ca/Ca+SO4 ratios of the groundwater, and correlation matrices of major ion chemistry, also show a blending of groundwater with seawater. Mutual relationships among Li+, Sr2+, and C1- ions further substantiate the marked influence of the marine environment on the groundwater in the study area.
本研究旨在探讨海水稀释以及其他水质成分的作用，以确定巴基斯坦塔尔沙漠迪普洛分区地下水中高氟浓度的空间分布原因。研究发现氟离子浓度高达 7.60 毫克/升，平均值和中位数分别为 1.66 毫克/升和 1.34 毫克/升。根据总溶解固体（TDS）比值的估算，表明海水入侵对地下水的影响约为 8.05%。水在派珀图中中心钻石形状的主要离子化学精确地标定了海水侵入研究区的现象。Na+K 对 Ca+Mg（meq/L）和 log C1（mg/L）对 log Ca+Mg/Na+K（meq/L）的图表明淡水与海水混合。地下水的摩尔 Na/Na+Cl 和 Ca/Ca+SO4 比值以及主要离子化学的相关矩阵也表明地下水与海水混合。Li+、Sr2+和 C1-离子之间的相互关系进一步证实了海洋环境对研究区地下水的显著影响。
