Univrsity of Tehran Press Geopersia 2228-7817 14 2 2024 11 23 Controls on groundwater chemical quality in Semnan aquifer, central Iran - 327 339 96985 10.22059/geope.2024.371030.648743 EN Hadi Jafari Faculty of Earth Sciences, Shahrood University of Technology, Iran Bahareh Ekramipour Geology Office Sajjad Moradi Nazarpoor Faculty of earth Sciences, Shiraz university, Iran Faculty of Earth Sciences, Iran Payam Noor University, Iran Rahim Bagheri Faculty of Earth Sciences, Shahrood University of Technology, Iran Somayeh Zarei Faculty of Earth Sciences, Shahrood University of Technology, Iran Yazdan Mohebi Faculty of Earth Sciences, Iran Payam Noor University, Iran Journal Article 2024 01 13 Considering the significance of groundwater for human activities, it is imperative to primarily focus on assessing both the quality and quantity of the water resources. Various hydrochemical processes such as dissolution and precipitation of minerals perpetually change groundwater quality. Identifying the dominant factors that impact groundwater chemistry is crucial for comprehensive management of these vital resources. This study was aimed to assess groundwater quality to identify factors affecting hydrochemistry of the groundwater in Semnan aquifer (central Iran) using chemical and statistical techniques. In this regard, 36 samples were collected from proper locations and analyzed for major ions and physicochemical parameters. The main factors affecting groundwater quality was inferred by applying composite diagrams and simultaneous integration of statistical (Principal Component Analysis) and hydro-chemical methods. This study reveals that chemical quality of the groundwater resources in Semnan aquifer are primarily influenced by geological formations due to dissolution of evaporate minerals. The results indicate the minor impact of the ion exchange and precipitation of calcite due to common ion effect, as compared with the significant role of dissolution of evaporates Hydro-chemical approach statistical technique Hydrogeochemistry PCA Semnan https://geopersia.ut.ac.ir/article_96985_134b82602c462ad64d7f384bb3c4708a.pdf