南宁市主要饮用水源地水环境健康风险分析

为了解南宁市主要饮用水源水环境质量,分析其对人体健康产生风险水平,对2008—2012年南宁市饮用水源水环境质量进行了分析,并采用美国国家环境保护局(USEPA)推荐的健康风险模型对其所引起的健康风险做了初步评价。结果表明,南宁市主要水源地各污染物环境健康风险水平大小顺序为砷氟化物硝酸盐氨氮铁锰,化学致癌物引起的健康风险水平比非致癌物所致的健康风险水平高4个数量级。水源地水环境健康风险水平主要取决于致癌物质健康风险水平。2008—2012年邕江水源地致癌物质总风险水平较高,空间变化不明显,年际变化呈逐年下降趋势。南宁市主要水源地水环境健康风险水平应受到足够的重视,化学致癌物砷应当作为邕江水源地饮用水源需优先治理的污染物,必须在人们饮用之前将其去除,降低环境健康风险。

Water Environmental Health Risk Analysis for the Main Drinking Water Source of Nanning City

To explore the The quality of drinking water resources of Nanning in 2008-2012,assess the potential risks to human health. The quality of drinking water resources of Nanning in 2008-2012 was analyzed and primary health risk assessment was also done used the health risk assessment model recommended by US EPA.Health risk caused by pollutants in drinking water were in the order of As＆gt;F - ＆gt;NO3 -N ＆gt;NH3 -N ＆gt;Fe ＆gt;Mn.Health risk caused by chemical carcinogens are 4 orders of magnitude higher than that of non-chemical carcinogens.Chemical carcinogens are the key factors to the health risk level of drinking water resources.Spatial variation of health risk level caused by chemical carcinogens in Yongjiang river resources in 2008-2012 was not significant and temporal varia-tion went down with each passing year.Chemical carcinogens especially As should be treated preferentially in Yongjiang river resources and must be eliminated before drinking to lower the health risk level.