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

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

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。

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 detemlinated 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.