摘要
于2012年5月至2013年5月对广州市城区大气细粒子的质量浓度和含碳气溶胶的组分进行了连续一年的观测,获得了广州地区大气细粒子中含碳气溶胶的年变化特征。结果显示,广州市PM2.5的浓度冬季明显高于夏季,年均值浓度为66.6μg/m3,OC、EC的浓度整体变化趋势和PM2.5浓度变化相似,其中有机碳OC和无机碳EC分别在12月达到最高含量16.21和2.51μg/m3,占PM2.5的18%和3%。烷烃在冬季高浓度时期的平均浓度为124.76 ng/m3,是低浓度时期(23.73 ng/m3)的5.3倍,高碳数烷烃含量较高,以n C31为主峰碳,有强烈的奇碳优势;多环芳烃和霍烷在高浓度时期的平均浓度分别为66.98和1.69 ng/m3,不同季节广州大气细粒子中PAHs分子分布也不同,霍烷则以17α(H),21β(H)-霍烷和17α(H),21β(H)-30-降霍烷的含量较高。
Annual continuous measurements were conducted to investigate the characteristics of PM2.5and carbonaceous aerosol in Guangzhou from May, 2012 to May, 2013. The average mass concentration of PM2.5was 66.6 ng/m3, higher in winter than in summer. Organic carbon(OC) and elemental carbon(EC) had the same variation trend as PM2.5, the mass concentrations of OC and EC reached the highest value 16.21 and 2.51 ng/m3, which accounted for 18% and 3% in PM2.5, respectively. The average alkanes concentration in winter was 124.76 ng/m3, which was 5.3 times than in lower level period. The concentration of high molecular weight alkanes was higher than low molecular weight alkanes, the plant wax n-alkanes had strong odd-even carbon number, Cmaxwas C31 for Guangzhou. The average concentrations for PAHs and hopanes in high concentration period were 66.98 and 1.69 ng/m3, the distribution pattern of PAHs in different season was different, 17α(H),21β(H)-hopane and 17α(H),21β(H)-30-norhopane showed higher concentration in PM2.5in Guangzhou.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2014年第S2期190-194,共5页
Environmental Science & Technology
基金
广州市科技计划项目(2013J4100106)
