Hydrogeochemical evaluation, groundwater quality and arsenic concentration of Sirjan plain using GIS and AqQa softwares

Water quality assessment is an important step for optimal and proper use of water resources for drinking and selection of suitable and consistent water quality patterns. Therefore, the necessity of studying water qualitycharacteristics in water resource management programs has been highly considered. in this study, the water quality dada of Sirjan Plain, were gathered water quality data from 2002 to 2015, were analyzed by AqQA and SPSS software, and then evaluated using Schuler,Wilcox, and Stiff charts,in the next step by the data 2015 from(GIS) system,Interpolation method(IDW)was used to provide water quality zoning maps. The analysis results showed that the water quality, The groundwater piper diagram of the study area has the dominant Na-Cl facies and is grouped to saline waters. According to the Wilcox chart, agricultural water is predominantly saline and highly saline (C3 ,C4), According to the Schuler diagram, drinking water is of medium to completely unpleasant quality, And in terms of stiff diagrams, groundwater is in the type of sodium chloride and chlorinated water. The concentration of arsenic in many areas of this plain is above the standard .The data of the present study show One of the problems of water resources in Sirjan plain is the high amount of salt and soluble substances, Which shows the great influence of geological formations (evaporation) on groundwater resources and reducing the quality of water resources.