Quality Evaluation of Groundwater Pollution Based on Geological Formation

This study evaluated the quality of groundwater resources in the Abdullah Gio area, southwest of Quchan, Khorasan Razavi province, Iran in 2020. According to the type of geological formations, discharge, and location of water resources in the region, 10 groundwater sources were analyzed for qualitative analysis and evaluation. Physical parameters such as pH, electrical conductivity (EC), and total dissolved solids (TDS) were measured at the sampling site with a multimeter. Hydrogeochemical analysis of data in the laboratory was performed by induction plasma method and statistical analysis and modeling were performed in SPSS, Chemistry, and AqQA software. Findings showed that most of the sources are suitable in terms of drinking quality, and GQI quality index was acceptable in these sources. In terms of exploitation in the agricultural sector, the alkalinity of all water resources was based on the Wilcox classification in S2 and S4 classes and in terms of salinity in C2 and C3 classes and showed that most of the resources are not suitable in terms of agriculture. In all resources, the amount of bicarbonate was higher and the amount of nitrate was lower than the world standard. Finally, the study of geological formations showed their effect on water quality, and nitrate concentration was detected due to human activities.