In this study, the physicochemical parameters, major ions and arsenic (As) contents of water resources in the Yazir lake wetland, were evaluated. In addition, water resources in this region were investigated from the point of water quality and health risk assessment. Thirty water samples were collected from the area in dry and wet seasons. Ca-Mg-HCO3 and Ca-HCO3 were the dominant water types. The Gibbs diagram suggests that most of the samples fall in rock-dominance zone, which indicates the groundwater interaction between rock chemistry. When compared to drinking water guidelines established by World Health Organization and Turkey, much greater attention should be paid to As, Fe, and Mn through varied chemicals above the critical values. According to the pH-ORP diagram, the predominant species is arsenate (H2AsO4-2). The high concentrations of As in the surface water and groundwater are related to oxidative and reductive dissolution reaction of Fe and Mn hydroxides within the Kizilcadag ophiolite and melange. In addition, the seasonal changes in As concentrations depend on the increase in pH of water samples. The major toxic and carcinogenic chemical within water samples is As for groundwater and surface water. From the results of hazard index, it is verified that As which is taken by ingestion of water was the main contaminant, and toxic human risk in the study area. The obtained results will help define strategies for As problems in the water resources in future.
<p>In this study, the physicochemical parameters, major ions and arsenic (As) contents of water resources in the Yazır lake wetland,<br />were evaluated. In addition, water resources in this region were investigated from the point of water quality and health risk<br />assessment. Thirty water samples were collected from the area in dry and wet seasons. Ca-Mg-HCO<span style="font-size:7pt">3 </span>and Ca-HCO<span style="font-size:7pt">3 </span>were the<br />dominant water types. The Gibbs diagram suggests that most of the samples fall in rock-dominance zone, which indicates the<br />groundwater interaction between rock chemistry. When compared to drinking water guidelines established by World Health<br />Organization and Turkey, much greater attention should be paid to As, Fe, and Mn through varied chemicals above the critical<br />values. According to the pH-ORP diagram, the predominant species is arsenate (H<span style="font-size:7pt">2</span>AsO<span style="font-size:7pt">4</span>-<span style="font-size:7pt">2</span>). The high concentrations of As in the<br />surface water and groundwater are related to oxidative and reductive dissolution reaction of Fe and Mn hydroxides within the<br />Kızılcadağ ophiolite and melange. In addition, the seasonal changes in As concentrations depend on the increase in pH of water<br />samples. The major toxic and carcinogenic chemical within water samples is As for groundwater and surface water. From the<br />results of hazard index, it is verified that As which is taken by ingestion of water was the main contaminant, and toxic human risk<br />in the study area. The obtained results will help define strategies for As problems in the water resources in future.</p>