宁波市区冬季大气颗粒物及其主要组分的污染特征分析

为了更好地研究影响宁波市区环境空气质量的污染物变化特征,于2010年1月20—30日进行了加强监测。研究结果表明,宁波市区大气中PM₁₀和PM_2.5质量浓度较高,其中PM_2.5/PM₁₀为0.5~0.85。对PM₁₀和PM_2.5采样膜分析,水溶性粒子和含碳组分分别占PM₁₀和PM_2.5质量浓度的56.7%和66.9%,其中二次污染的水溶性离子SO₄^2-、NO₃^-和NH₄⁺是PM₁₀和PM_2.5中浓度较高的离子组分;PM_2.5样品中OC与EC的相关性较好,表明OC与EC的来源相对一致,可能主要来自机动车尾气的贡献;但PM₁₀样品中OC与EC的相关性较差,表明其来源相对复杂;其中SOC的浓度占OC的13%~35%,说明宁波市区冬季导致二次污染的光化学反应不活跃。

Pollution Characteristics of Particles and Its Main Components in Ningbo Urban Atmosphere

In order to better study the impact of Ningbo urban air quality changes in characteristics of pollutants, to strengthen monitoring from January 20th to 30th, 2010. The results show that higher concentrations of PM₁₀ and PM_2.5 mass in the atmospheric of Ningbo urban, and the ratio of PM_2.5/PM₁₀ is between 0.5 and 0.85. Through PM₁₀ and PM_2.5 sampling film analysis,water-soluble components of particles and carbon, respectively, accounted for PM₁₀ and PM_2.5 mass concentration of 56.7% and 66.9%, and one secondary pollution of water-soluble ion SO₄^2-, NO₃^- and NH₄⁺ is a higher concentration of PM₁₀ and PM_2.5 in the ion composition. OC and EC has a good correlation in the PM_2.5 sample, which indicated that the source of OC and EC is relatively consistent, probably mainly from the contribution of vehicle exhaust. However, OC and EC has a poor in correlation PM₁₀ samples, which indicated that the source of OC and EC is relatively consistent, probably mainly from the contribution of vehicle exhaust. However, OC and EC has a poor in correlation PM₁₀ samples, which indicated that the source is relatively complex. The ratio of SOC/OC is between 13% and 35%, which indicated secondary pollution of photochemical reactions are not active in Winter in Ningbo city.