Comprehensive understanding of groundwater quality for domestic and agricultural purposes in terms of health risks in a coal mine area of the Ordos basin, north of the Chinese Loess Plateau

• Published in: Environmental earth sciences Vol. 78; no. 15; pp. 1 - 17
• Main Authors: Wu, Jianhua, Zhou, Hui, He, Song, Zhang, Yuxin
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.08.2019; Springer Nature B.V
• Subjects: Adults; Agricultural management; ammonium; Ammonium nitrogen; Anions; basins; bicarbonates; Biogeosciences; Calcium; Calcium ions; Carcinogens; Cations; Children; China; chlorides; Coal; Coal mines; Coal mining; Contaminants; Earth and Environmental Science; Earth Sciences; Environmental Science and Engineering; Fluorides; Geochemistry; Geology; Groundwater; Groundwater management; Groundwater quality; health effects assessments; Health risk assessment; Health risks; Hydrogeochemistry; Hydrology/Water Resources; Ingestion; Iron; Irrigation; Magnesium; Manganese; nitrates; nitrites; Nitrogen dioxide; Physicochemical analysis; Pollution control; potassium; Quality assessment; Quality control; Rain; Rain water; Reliability analysis; Risk; Risk assessment; Skin; sodium; Statistical analysis; Statistical methods; sulfates; Sulphates; Terrestrial Pollution; Thematic Issue; Water harvesting; Water in Large Basins; Water quality; Water quality assessments; Ordos Basin; China; Groundwater pollution; Groundwater quality; Water quality assessment; Fuzzy comprehensive assessment; Health risk assessment
• DOI: 10.1007/s12665-019-8471-1
• ISSN: 1866-6280

Assessment of groundwater quality and health risk was conducted in the Shenfu coal mine area in Ordos basin, northwestern China. Statistical analysis, Piper and Chadha diagrams were used to reveal the hydrogeochemical characteristics of groundwater via physicochemical analysis of 44 collected samples. The suitability of groundwater was assessed for domestic and irrigation purposes, and the fuzzy comprehensive method was adopted to assess the overall groundwater quality for further discussion on groundwater management. The model recommended by the USEPA was selected to estimate the non-carcinogenic risks caused by NO 3 − , NO 2 − , NH 4 + , F − , Fe and Mn through oral ingestion and direct dermal contact. The results revealed that the predominant hydrochemical types of groundwater were SO 4 ∙Cl–Ca∙Mg and HCO 3 –Ca∙Mg types and the major cations and anions followed the orders of Ca 2+  > Na +  > Mg 2+  >K + and HCO 3 −  > SO 4 2−  > Cl − , respectively. Groundwater is generally acceptable for irrigation. However, for domestic purposes, 47.73% of the collected samples are of excellent and good quality and are suitable for direct consumption. Both adults and children face non-carcinogenic risks because of exposure to contaminants such as nitrate, nitrite and fluoride. The risk to children is higher than that to adults, which is consistent with other studies. Nitrite contributes most to the risks, followed by nitrate and fluoride. Home-use water quality improvement devices and rainwater harvesting are suggested to enhance the groundwater quality protection and management in this area. The research also indicates that health risk assessment should always accompany general water quality assessment to ensure the reliability of the water quality assessment.