北京密云水库富营养化和微囊藻毒素污染水平初步调查分析

目的调查北京密云水库的富营养化状况和微囊藻毒素污染水平。方法选取密云水库的5个点,用LC/MS/MS测定了水中微囊藻毒素-LR和RR。富营养化的有关指标藻细胞数、叶绿素-a(Chl-a)、总磷(TP)、总氮(TN)、化学耗氧量(COD)、总有机体(TOC)、铁(Fe)和浊度用常规的分析方法,现场测定水温。结果密云水库受到有机污染物污染较小。根据叶绿素和总磷的评价标准,结合评分法进行综合评价表明密云水库的富营养化程度还很低。在密云水库中检出了微囊藻毒素,最高值出现在9月份,MC-LR和MC-RR的浓度分别为41ng/L和18ng/L。结论北京最大的水源地密云水库的富营养化程度还很低,属于贫营养型。密云水库中的微囊藻毒素浓度最大值还远低于我国的卫生标准,北京的饮用水源应该是安全的。

Preliminary survey on water eutrophication and microcystins level in Beijing Miyun Reservoir

Objective In order to survey water eutrophication and microcystin levels in Beijing Miyun Reservoir.Methods Mivrocystin-LR (MC-LR),and MC-RR were determinated by LC/MS/MS at 5 sample sites in Miyun Reservoir.Eutrophication parameters,which were determinated by conventional analytical methods,included algae number, chlorophyll-a (Chl-a),total phosphor (TP),total nitrogen (TN),COD,TOC,Fe,turbidity and water temperature.Results Water in Miyun Reservoir was polluted very little by organic matter.According to Chl-a,TP appraise criterion and grading method,Miyun Reservoir was eutrophicated very little.MC-LR and MC-RR could be detected out in water of Miyun Reservoir.Maximum concentration was discovered in September,MC-LR 41ng/L and MC-RR 18ng/L respectively.Conclusion Beijing Miyun Reservoir was poor-eutrophic.Microcystins concentration in water of Miyun Reservoir was far lower than our country health standard.