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Cheng Q.,North China University of Water Conservancy and Electric Power | Wu H.,Zhengzhou Environmental Monitoring Center | Wu Y.,Zhengzhou Environmental Monitoring Center | Li H.,Zhengzhou Environmental Monitoring Center | And 2 more authors.
Aquatic Ecosystem Health and Management | Year: 2013

Groundwater quality and suitability for drinking purposes in Zhengzhou City were investigated. A total of 30 water samples from 15 major monitoring wells were collected in January (dry season) and July (wet season), 2009. Seven common physicochemical (pH, permanganate index, ammonia, chloride, sulfate, hardness and the total dissolved solids) and 11 toxicological parameters (fluorine, nitrate, Zn, Fe, Mn, Cu, Cd, Pb, Se, Cr (VI) and As) were analyzed. Human health risk assessment for pollutants and water quality index for drinking purposes were also evaluated. The results showed that 6.7% of groundwater samples were considered as permissible for drinking and others as desirable; concentrations of chromium (VI) at site 14 and 15 were lower than the risk-based concentration associated non-carcinogenic effects (0.11 mg l-1), while higher than the standard associated carcinogenic effects (4.5E-5 mg l-1). The carcinogenic risk was 3.75E-6 at site 14 and 4.55E-6 at site 15, which indicated that the risks at both sites were serious. The uncontrolled consumption of poor quality groundwater may be dangerous for local human health. Concentrations of other elements were not detected nor found to be exceeding the highest acceptable limit of World Health Organization. Water quality index indicated that the quality of all the groundwater samples collected was excellent during both dry and wet seasons. Lower water quality indices during the wet season indicated a better quality of the groundwater than the dry season, and the main reasons were external input following seasonal rainfall events and evaporation. Significant variation of water chemistry strongly expressed the impact of surface contamination sources, overexploitation and mineral dissolution. © 2013 Copyright Taylor and Francis Group, LLC.


Cheng Q.,North China University of Water Conservancy and Electric Power | Wu H.,Zhengzhou Environmental Monitoring Center | Wang W.,Henan Institute of Education | Wu Y.,Zhengzhou Environmental Monitoring Center | And 2 more authors.
Water International | Year: 2012

To evaluate the potential adverse effects caused by pollutants in the surface water sources of drinking water in Zhengzhou, concentrations of 10 elements were measured and their health risks assessed. The results show that only some concentrations of iron, manganese and fluorine are higher than the corresponding environmental quality standards. Risk assessments indicate that risk quotients (all values with carcinogenic effects of arsenic, three values of worst-case of lead and one value of worst-case of fluorine) exceed the limits respectively; one hazard index of fluorine is more than 1; and all 95% of cancer-risk values of arsenic and lead are above 1.0E-6. © 2012 Copyright 2012 International Water Resources Association.


Wang W.,Henan Institute of Education | Wu H.,Zhengzhou Environmental Monitoring Center | Wu Y.,Zhengzhou Environmental Monitoring Center | Li H.,Zhengzhou Environmental Monitoring Center | Cheng Q.,North China University of Water Conservancy and Electric Power
5th International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2011 | Year: 2011

To obtain a better knowledge regarding the influence of wastewater-irrigation on agriculture soils and food crops in Zhengzhou, five villages were selected and food crop samples were collected in 2009. The concentrations of seven metals of Cd, Pb, Zn, Cu, Cr, Hg and As were detected. Results showed that the concentrations of Cd, Hg, Zn and Pb in soil samples were a light buildup over the local background levels, and the ratios were 1.26, 1.16, 1.64 and 1.55 respectively, but still met the farmland environmental quality evaluation standards for edible agricultural products. Metal concentrations in food crops were under the permissible limits for food. The trend of bio-accumulation factors in vegetables was in the order: Zn>Cu> Pb> Cr, Cd, As and Hg; and in rice crops was Zn>Cr>Pb, Cu, Cd and As. All the hazard quotient values of adults and children were less than 1, which indicated that the consumption of food crops grown in wastewater-irrigation soils was nearly free of risks and generally assumed to be safe. © 2011 IEEE.


Wang F.,Henan Institute of Engineering | Wang F.,Zhengzhou University | Xin C.,Henan Institute of Engineering | Wu Y.,Zhengzhou Environmental Monitoring Center | And 2 more authors.
Journal of Analytical Chemistry | Year: 2011

A glassy carbon electrode coated with film of 4-tert-butyl-1- (ethoxycarbonylmethoxy)thiacalix[4]arene is designed for the determination of trace amounts of Ag+. Compared with bare glassy carbon electrode, the modified electrode can greatly improve the measuring sensitivity for Ag +. Under the optimum experimental conditions, the modified electrode in B-R buffer solution (pH 4.5) shows a linear voltammetric response in the range of 5.0 × 10-8-3.0 × 10-6 M with detection limit 1.0 × 10-8 M for Ag+. The high sensitivity, selectivity, and stability of modified electrode also demonstrate its practical application for a simple, rapid and economical determination of Ag+ in water samples. © 2011 Pleiades Publishing, Ltd.

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