【作者】 徐雪梅； 冯小琼； 陈军辉； 尹寒梅； 钱骏；

【Author】 Xu Xuemei;Feng Xiaoqiong;Chen Junhui;Yin Hanmei;Qian Jun;Sichuan Academy of Environmental Sciences;Sichuan Province Environmental Protection Technology Engineering Co., Ltd;

【机构】 四川省生态环境科学研究院； 四川省环保科技工程有限责任公司；

【摘要】 为研究川南地区乐山、宜宾、泸州3城市四季PM_{2. 5}污染特征及来源,于2016-10—2017-07对PM_{2. 5}进行样品采集,分析其质量浓度和化学成分（水溶性无机离子、碳组分、金属元素）,得出四季PM_{2. 5}化学组分污染特征。结果表明,2016—2017年采样期间ρ(PM_{2. 5})乐山市为81.4μg/m³、宜宾市为74.8μg/m³、泸州市为69.0μg/m³,季节性特征明显,基本呈秋冬高,春夏低,且城市之间ρ(PM_{2. 5})具有较高的相关性,相关系数均>0.78。重污染过程期间,二次气溶胶呈加剧转化过程,OC、EC具有较好的同源性。源解析结果表明:PM_{2. 5}污染来源主要是燃煤、城市扬尘、机动车以及二次源,燃煤源四季贡献率均>15%,城市扬尘则表现为春季最高,贡献率均在20%左右;二次源秋冬季贡献率明显高于春夏季,秋冬季贡献率均>25%,说明川南地区在控制燃煤和城市扬尘等一次排放源的基础上,还需加强对二次源前体物的控制。更多还原

【Abstract】 In order to explore the characteristics and sources of PM_{2. 5} pollution in Leshan, Yibin and Luzhou in Southern Sichuan, PM_{2. 5} samples were collected from October 2016 to July 2017 representing the four seasons. Their mass concentration and chemical composition（ including water-soluble inorganic ions, carbon components, metal elements） were analyzed to obtain the distribution characteristics of PM_{2. 5} chemical components in four seasons. The results showed that the mass concentration of PM_{2. 5} in Leshan, Yibin, Luzhou were 81. 4, 74. 8, 69. 0 μg/m3, respectively. Seasonal characteristics were obvious in three cities, showing high in autumn and winter, and low in spring and summer. The PM_{2. 5} mass concentration in the three cities had high correlation with a correlation coefficient >0. 78 between each other. The secondary aerosols in PM_{2. 5} of the three cities showed an intensified transformation process, and OC and EC had good homology during the heavy pollution process. The pollution sources of PM_{2. 5} in the three cities were mainly coal burning, urban dust, motor vehicles and secondary sources. The contribution rate of coal-fired sources in four seasons was higher than 15%; the contribution rate of urban dust was the highest in spring, and the proportion of the three cities was around 20%; the contribution rate of secondary source in autumn and winter was obviously higher than that in spring and summer, and the proportion of the three cities was greater than 25%. It was pointed out that the three cities in southern Sichuan need to strengthen the control of secondary source precursors, in addition to controlling primary sources such as coal burning and urban dust.更多还原