周村水库大气湿沉降氮磷及溶解性有机物特征

为揭示周村水库大气湿沉降中污染物的污染特征,通过收集周村水库2016年3月至2017年2月大气湿沉降样品,测定了大气湿沉降中氮磷以及溶解性有机物的质量浓度,分析了污染物的污染特征及大气湿沉降量的变化规律。结果表明:周村水库的降水主要集中在夏秋季,占全年的68.50%;降水中总氮质量浓度在1.67~7.63 mg/L之间,氨氮和硝氮是其主要组分,分别占总氮的52.91%和28.49%;降水中的硝氮和氨氮年湿沉降通量分别为772.45mg/m^2和1411.99 mg/m^2,且与降水量呈显著正相关关系(P<0.01);单因子水质评价法和综合污染指数法评价得出大气湿沉降中的降水大多为劣Ⅴ类的重度污染水体;总磷和有机物的湿沉降通量最大值出现在夏季,与降水量也呈显著正相关关系(P<0.01);大气湿沉降中的溶解性有机物以富里酸为主,呈现较强的自生源特征。

Characteristics of nitrogen, phosphorus and dissolved organic matter in atmospheric wet deposition of Zhoucun Reservoir

In order to reveal the pollution characteristics of pollutants in atmospheric wet deposition of Zhoucun Reservoir, the atmospheric wet deposition samples of zhoucun reservoir from March 2016 to February 2017 were collected and the mass concentrations of nitrogen, phosphorus and dissolved organic matter(DOM)in the wet deposition were measured, and the pollution characteristics of pollutants and the variation law of atmospheric wet deposition were analyzed. The results show that the precipitation of Zhoucun Reservoir is mainly concentrated in summer and autumn, accounting for 68.50% of the whole year, and the total nitrogen concentration in precipitation is between 1.67 and 7.63mg/L, with ammonia nitrogen and nitrate nitrogen as the main components, accounting for 52.91% and 28.49% of the total nitrogen, respectively. The annual wet deposition fluxes of nitrate-nitrogen and ammonia-nitrogen in precipitation were 772.45 mg/m² and 1411.99mg/m², respectively, which had a significant positive correlation with precipitation(P<0. 01). The precipitation in atmospheric wet deposition is mostly the heavily polluted water body of Inferior Class V based on single factor water quality assessment and comprehensive pollution index method. The maximum wet deposition fluxes of total phosphorus and organic matter occured in summer, and had a significant positive correlation with precipitation(P<0. 01). The organic matter in atmospheric wet deposition is mainly fulvic acid, which shows strong autogenous source characteristics Fulic-like substance was the majority proportion of dissolved organic matter, and the rainwater exhibited strong autochthonous component characteristics.