上海市青浦区黑碳污染特征分析

Analysis of Black Carbon Pollution Characteristics in Qingpu District

本研究通过对青浦区淀山湖监测站点周边船舶排放PM_(2.5)和所用油品的组分分析,分析油品中硫分,研究其对环境空气中SO_(2)的贡献,通过分析船只排放的PM_(2.5)中的黑碳和环境空气中的黑碳组分,判断船只排放对环境空气PM_(2.5)的贡献。研究表明,BC与氮氧化物的高度相关性显示其具有一定的同源性,该区域BC/NO_(2)的特征值处于0.04~0.11范围,该站点附近受柴油机活动影响较大;PM_(2.5)中碳质气溶胶来自交通运输源和燃煤的综合作用,交通运输过程污染来源主要为船舶发动机尾气排放。该站点不容易受到来自外海船舶排放的影响,应重视内陆河道湖泊上船舶的排放影响。

The composition of PM_(2.5) emissions and oil products used by ships in Qingpu waters was investigated,the sulfur content of oil products was analyzed,its contribution to SO_(2) in ambient air was studied,and the contribution of ship emissions was determined to ambient air PM_(2.5) by analyzing the black carbon in PM_(2.5) emitted by ships and the black carbon components in ambient air.The results showed that the high correlation between BC and nitrogen oxides indicated that BC/NO_(2) had a certain homology,and the eigenvalues of BC/NO_(2) in this area were all within the range of 0.04 to 0.11 by the feature ratio method,indicating that the site was greatly affected by diesel engine activities.At the same time,through the determination of the ratio of OC to EC,the carbon aerosol in PM_(2.5) in Qingpu District also came from the combined effect of transportation sources and coal burning.Combined with the local actual situation,the pollution source of the transportation process was mainly the exhaust emissions of ship engines.According to the transport characteristics of the air mass,Qingpu station was not easily affected by the discharge of ships from the sea,but should pay attention to the impact of the discharge of ships on inland rivers and lakes.