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为研究汪洋沟流域的水质状况及其生物毒性,于2013年7月,对汪洋沟12个采样点位水样中的溶解氧(DO)、生化需氧量(COD)、总氮(TN)、氨氮(NH3-N)、总磷(TP)进行测定和评价。采用发光细菌法测定水质急性生物毒性。结果显示,DO除了南席村东合格外,其余点位均超标;而TN、TP、COD及NH3-N所有点位的测定值均超标。汪洋沟水样中DO、COD、NH3-N、TP、TN的单项污染指数分别为2.9、6.0、18.5、4.9、51.0,污染分担率分别为3.5%,7.2%,22.2%,5.9%,61.2%;水质污染指数为16.7,为严重污染状态。在汪洋沟的12个采样点中,中毒占16.7%,重毒占16.7%,高毒占66.7%。DO与生物毒性呈负相关,而TN、NH3-N、COD与生物毒性呈正相关,TP与发光抑制率无统计学相关性。提示沿途排入的工业废水及生活污水可能是毒性的主要来源,可运用TN、NH3-N、COD评价汪洋沟水质污染状况和急性生物毒性。
In order to study the water quality and biological toxicity of Wangyanggou watershed, DO, DO and TN in 12 sampling sites of Wangyanggou were analyzed in July 2013, , Ammonia nitrogen (NH3-N), total phosphorus (TP) were measured and evaluated. Determination of Acute Biological Toxicity of Water by Luminescent Bacteria Method. The results showed that, except for the south of the village, DO exceeded the standard, while the values of TN, TP, COD and NH3-N exceeded the standard. The single pollution index of DO, COD, NH3-N, TP and TN in Wangyanggou water samples were 2.9, 6.0, 18.5, 4.9 and 51.0 respectively, and the pollution share rates were 3.5%, 7.2%, 22.2%, 5.9% and 61.2 %; Water pollution index is 16.7, as a serious pollution status. In Wang Yanggou’s 12 sampling sites, 16.7% were poisoned, 16.7% were heavy and 66.7% were highly toxic. There was a negative correlation between DO and biological toxicity, while TN, NH3-N and COD were positively correlated with the biological toxicity. There was no significant correlation between TP and luminescence inhibition rate. It is suggested that the industrial wastewater and domestic sewage discharged along the route may be the main source of toxicity. TN, NH3-N and COD can be used to evaluate the water pollution and acute biological toxicity of Wangyangou.