Water Quality and Hydrogeochemical Characteristics of Some Karst Water Sources in Apuseni Mountains, Romania

Human activities and natural factors determine the hydrogeochemical characteristics of karst groundwaters their use as drinking water. This study assesses 14 water sources in Apuseni Mountains (NW Romania) potential sources. As shown by Durov Piper diagrams, chemical composition waters is typical it dominated HCO3− Ca2+, having a circumneutral to alkaline pH total dissolved solids ranging between 131 1092 mg L−1. The relation major ions revealed that dissolution main process contributing chemistry. Limestone dolostone are Ca Mg sources, while halite Na Cl source. Gibbs diagram confirmed rock dominance groundwater quality index (GWQI) showed excellent quality, except for two displayed medium good status. studied influenced geological characteristics, mainly water–rock interaction and, more limited extent, anthropogenic activities. investigated could be exploited resources area. results present highlight importance context good-quality shortage but also vulnerability this resource influences.