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研究论文

陶俊,柴发合,朱李华,高健,曹军骥,王启元,罗磊.2009年春季成都城区碳气溶胶污染特征及其来源初探[J].环境科学学报,2011,31(12):2756-2761

Characteristics and sources of carbonaceous aerosol in the urban Chengdu during spring of 2009

摘要：于2009年4月19日至5月17日在成都城区每天采集PM_2.5样品,然后对样品进行8种碳组分、水溶性有机碳、左旋葡聚糖及水溶性离子分析,初步探讨了碳气溶胶的来源.结果发现:成都春季PM_2.5日均值质量浓度为(133.2±55.5)μg·m^-3,TC、OC、EC和WSOC质量浓度分别为(26.4±7.2),(20.7±6.0),(5.7±1.8)和(10.4±3.4) μg·m^-3,左旋葡聚糖质量浓度为(396.5±405.3) ng·m^-3,最大值达到1820.9 ng·m^-3.因子分析结果表明OC2、OC3、OC4和WSOC主要来源于生物质燃烧排放,EC1主要来源于燃煤排放,EC2、EC3主要来源于机动车排放.利用中国地区生物质燃烧源成分谱LC/OC比值计算得到生物质燃烧对OC和TC平均贡献率分别为46.0%和36.6%.

Abstract：Aerosol samples for PM_2.5 were collected from 19 April to 17 May 2009 in Chengdu. The concentrations of eight carbon fractions, water-soluble organic carbon (WSOC), levoglucosan and water-solubility ions of all particle samples were obtained by chemical analyses. The characteristics and sources of carbonaceous aerosols were investigated. The results showed that the average mass concentration of PM_2.5 was (133.2±55.5) μg·m^-3. The average value of total carbon (TC), organic carbon (OC), elemental carbon (EC) and WSOC were (26.4±7.2), (20.7±6.0), (5.7±1.8) and (10.4±3.4) μg·m^-3, respectively. The averaged levoglucosan concentration was (396.5±405.3) ng·m^-3 with maximum of 1820.9 ng·m^-3.Factor analysis indicated that OC2, OC3, OC4 and WSOC came mainly from biomass burning, while EC1 from coal combustion and EC2 and EC3 from vehicle exhaust. Calculation by LC/OC ratio of biomass burning emission factor in China showed that the contribution rate of biomass burning to OC and TC was 46.0% and 36.6%, respectively.