黄河水源水浮游藻类及藻类毒素污染状况动态研究

目的 :探讨黄河水源水浮游藻类和藻毒素污染状况及影响因素。方法 :于 1998年 5～ 12月在河南省S市、Z市、P市水源水设采样点 ,对水源水浮游藻类、藻类毒素污染情况及总氮、总磷、COD等指标进行了连续检测。结果 :河南省黄河水源水总氮检出范围为 2 5 7～ 6 .79mg/L ,总磷的检出范围为 0 0 1～ 0 .32mg/L ,蓝藻和绿藻为浮游藻类的优势种群。MC的阳性率 ( >2 0ng/L)为 82 6 1% ,最高达到 95 7 9ng/L。结论 :按照Carlson提出的富营养化指数TSI(TP)判定标准 ,结合TN、TP、COD及藻类密度等指标 ,认为河南省境内黄河水源水已呈现富营养化特征。磷是黄河水源水浮游藻类生长的主要限制因子 ,控制黄河水源水富营养化应以控制磷为主。

Study on seasonal dynamics of the pollution of algae andmicrocystins in source water of Yellow River

Objective: To study the pollution and relevant factors of algae and microcystins in the source water of drinking water from Yellow River.Methods: Algae,microcystins and total nitrogen,phosphorus and COD of the source water in S city,Z city and P city were detected from May to Dec in 1998.Results: The total nitrogen range from 2.57～6.79 mg/L,and the total phosphorus range from 0.01～0.32 mg/L in the source water of drinking water.The dominant species of floating algae are blue green alga and cyanobacteria.The positive rate of microcystins (>20 ng/L) is 82.61%,and the biggest microcystins content is 957.9 ng/L in all of samples.Conclusion: Judged according to Carlson's trophic state index (TP),indexes of total nitrogen and total phosphorus,COD and algae density,the trophic state has emerged in the source water drinking water from Yellow River in Henan Province.Phosphorus is the dominant nutrient,which limits the growth of algae.Therefore,the phosphorus should be focused on for the eutrophication control of the source water of drinking water.