杭州市PM10中有机碳和元素碳变化特征

2001年2月至2002年4月在杭州5个空气质量国控点采集176组PM10样品，分析有机碳（OC）和元素碳（EC）含量，并采用TEOM法同步监测PM10质量浓度，其中在卧龙桥国控点同时测PM2.5质量浓度。全市PM10年日均浓度为119.2mg•m-3。PM2.5年日均浓度为68mg•m-3。PM2.5与PM10质量浓度呈显著的线性关系。PM2.5/ PM10日浓度比值范围在0.31-0.95间变化，平均比值为0.62。OC和EC浓度分别为20.4 mg•m-3和4.0 mg•m-3，其相关性不好表明碳的来源复杂。二次有机碳（SOC）分别占各季OC的 37.1%，45.8%，58.0%，44.7%，表明杭州空气中存在一定的二次有机污染。

Characteristics of organic and elemental carbon in PM10 over Hangzhou atmosphere

A total of 176 sets of PM10 samples have been collected at five automatic stations of air quality monitoring network in Hangzhou city from February 2001 to April 2002. The concentrations of organic carbon(OC) and elemental carbon(EC) have been analyzed. The mass concentration of PM10 have been analyzed synchronistically by TEOM method，the mass concentration of PM2.5 have been also analyzed in Wolongqiao automatic station. The annual average daily concentration of PM10 is 119.2mg•m-3，and of PM2.5 is 68mg•m-3.The relationship between the mass concentrations of PM2.5 and PM10 is obviously linear .The ratios of average 24-h PM2.5 to PM10 concentrations range from 0.31 to 0.95 ,the average ratio is 0.62. The average concentrations of OC and EC are 20.4 mg•m-3 and 4.0 mg•m-3 , respectively. The relationship of OC and EC is not good, implying the complex sources of OC and EC. Secondary organic carbon (SOC) accounting for 37.2% amount of OC in Spring,, 47.0% in Summer, 57.8% in Autumn and 43.7% in Winter, indicating the presence of secondary organic aerosols in atmosphere of Hangzhou.