烟台市PM2.5空间分布特征与来源解析

Spatial Distribution Characteristics and Source Apportionment of PM in Yantai City

2016—2017年,选取烟台市3个代表性点位采集了PM2.5样品,分析了其质量浓度和化学组成特征,并利用化学质量平衡(CMB)模型对环境空气受体进行了来源解析。结果表明:PM2.5浓度呈现出盛泉工业园点位[(68.9±30.5)μg/m3]>福山环保局点位[(64.5±25.5)μg/m3]>百盛商城点位[(58.8±19.2)μg/m^3]的空间分布特征。水溶性离子、碳组分(OC和EC)和地壳类元素表现出不同的分布特征,与各点位所代表的不同功能区有关。形成机制上,NO-3在福山环保局点位主要以NH4NO3形式存在,而在盛泉工业园点位存在一定的Ca(NO3)2形式占比。源解析结果显示,3个点位均受到海盐源的影响,福山环保局点位二次颗粒物污染最为严重(43.9%),盛泉工业园点位燃煤源贡献突出(16.4%)。

PM2.5 samples were collected at three sites in Yantai during 2016-2017,and their mass concentrations and chemical composition characteristics were analyzed in this paper.The receptor was analyzed using the Chemical Mass Balance(CMB)model.The results showed that the concentration of PM2.5presented the spatial distribution of the Shengquan Industrial Park[(68.9±30.5)μg/m3]>Fushan Environmental Protection Agency[(64.5±25.5)μg/m3]>Baisheng Mall[(58.8±19.2)μg/m3].Water-soluble ions,carbon components(OC and EC)and crustal elements showed different distribution characteristics,which were related to the different functional areas represented by the points.In terms of formation mechanism,NO-3 existed mainly in the form of NH4NO3 at the Fushan Environmental Protection Agency,while the Ca(NO3)2 form had a certain proportion in the location of the Shengquan Industrial Park.The results of source apportionment showed that the three points were affected by the sea salt source.And among the three points,the secondary particulate matter pollution of Fushan Environmental Protection Agency was the most serious(43.9%),and the contribution of coal source in Shengquan Industrial Park was outstanding(16.4%).