Abstract
Groundwater quality problems have emerged in many geographical areas due to natural environmental processes and human intervention in the geosystems. Hydrogeochemical appraisal of fluoride contaminated groundwater in Qinkenpao area, Daqing State, China is carried out by means of groundwater quality investigations. Results obtained from aqueous speciation modeling using AQUACHEM 5.1 reveal that the groundwater is undersaturated with fluorite and with calcite. The samples also contained high concentrations of nitrate, which is a serious water quality issue due to the impact of human activity. Factor analysis modeling demonstrated that NO3− in the system are produced by anthropogenic sources. Strong correlation observed between NO3− and Ca2+, Mg2+, Cl− and F−, suggesting that they have the same origin. The factor analysis indicates that sodium plus nitrate bicarbonate groundwater have a high loading factor for fluoride, whereas that for calcium chloride and magnesium chloride groundwater is low. The plausible geochemical reactions in the area of study are dissolution of calcite and dolomite, carbon dioxide and sulphate minerals with ion exchange. Key words: Aqueous speciation modeling, fluoride, nitrate, groundwater, hydrogeochemical, factor analysis.
Highlights
Water is an essential natural resource for sustaining life and environment that we have always thought to be available in abundance and a free gift of nature.chemical composition of surface or subsurface is one of the prime factors in which the suitability of water for domestic, industrial or agricultural purpose depends.Freshwater occurs as surface water and groundwater.Though groundwater contributes only 0.6% of the total water resources on earth, it is the major and preferred source of drinking water in rural as well as urban areas, in developing countries like China because treatment of the drinking water, including disinfection is often not required
Presence of various hazardous contaminants like fluoride, nitrate, arsenic, pesticides, other heavy metals etc. in groundwater has been reported from different parts of China
Located in the North Temperate Zone, Daqing belongs to the continental monsoon climate and is affected by the cold air mass from inland Mongolia and the monsoon comes from the warm air mass of the ocean
Summary
Water is an essential natural resource for sustaining life and environment that we have always thought to be available in abundance and a free gift of nature.chemical composition of surface or subsurface is one of the prime factors in which the suitability of water for domestic, industrial or agricultural purpose depends.Freshwater occurs as surface water and groundwater.Though groundwater contributes only 0.6% of the total water resources on earth, it is the major and preferred source of drinking water in rural as well as urban areas, in developing countries like China because treatment of the drinking water, including disinfection is often not required. Chemical composition of surface or subsurface is one of the prime factors in which the suitability of water for domestic, industrial or agricultural purpose depends. Freshwater occurs as surface water and groundwater. Though groundwater contributes only 0.6% of the total water resources on earth, it is the major and preferred source of drinking water in rural as well as urban areas, in developing countries like China because treatment of the drinking water, including disinfection is often not required. Presence of various hazardous contaminants like fluoride, nitrate, arsenic, pesticides, other heavy metals etc. The occurrence of high fluoride and nitrate concentration in groundwater has become one of the most important health-related geoenvironmental issues in many countries of the world. Fluoride and arsenic are the two main contaminants in groundwater present naturally and artificially in China, India, Egypt, Morocco, Saudi
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