Title: DRINKING WATER QUALITY AND ITS PRELIMINARY HEALTH RISK ASSESSMENT IN CHENGDU
Abstract: [Objective]To understand the hygienic status and health-based risk level of drinking water in Chengdu for the past two years.[Methods]Levels of As,chemical oxygen demand,total coliforms,etc. in drinking water and source water from all types of water supplies in 2008-2009 were determined based on stratified random samples,and health-based risk caused by the chemical pollutants in drinking water was assessed using US EPA health-based risk assessment model.[Results]A total of 190 water samples consisted of 165 drinking water samples and 25 source water samples were determined,with qualified rates of 72.6%,69.1% and 96.0%,respectively. The main pollutants in drinking water were coliforms and Mn,of which the qualified rates were 72.7% and 92.7%. The qualified rate ascending order of drinking water samples were those from rural non-central supply(19.2%),township mini-central supply(72.5%)and urban centralized supply(98.4%),with significant differences(all P﹤0.01). The unqualified drinking water samples were mainly in mountain area and used underground water as source water. With As,Cr6+ and Pb being the main contributors,the P50 and P95 values of cancerous risk caused by 8 chemicals(As,Cr6+,et al.)in drinking water were 128.3×10-6 and 299.1×10-6,which were significantly lower the maximum allowance levels recommended by ICRP(5×10-5/year,counted by 70 years). The P50 and P95 values of non-cancerous risk were 0.390 4 and 1.001 6,respectively,of which As,Cd and Pb were the main contributors.[Conclusion]This study primarily elucidates the hygienic status and health-based risk level of drinking water in Chengdu,as well as the risk order of the water contaminants,which would contribute to drinking water quality improvement and health-based risk management in this city.
Publication Year: 2011
Publication Date: 2011-01-01
Language: en
Type: article
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