• 关键词：PM_2.5  水溶性有机碳(WSOC)  类腐殖质碳(HULIS-C)  季节变化

• 基金项目：上海市教委科研创新基金(No.12ZZ054);中央高校基本科研业务费专项资金(No.WB1113005);博士点基金(No.20120074140001);国家自然科学基金(No.21277044);青海省自然科学基金(No.2011-Z-903)

• 黄众思
• 华东理工大学资源与环境工程学院, 国家环境保护化工过程环境风险评价与控制重点实验室, 上海 200237

• 修光利
• 华东理工大学资源与环境工程学院, 国家环境保护化工过程环境风险评价与控制重点实验室, 上海 200237

• 蔡婧
• 华东理工大学资源与环境工程学院, 国家环境保护化工过程环境风险评价与控制重点实验室, 上海 200237

• 徐薇
• 华东理工大学资源与环境工程学院, 国家环境保护化工过程环境风险评价与控制重点实验室, 上海 200237

• 王丽娜
• 华东理工大学资源与环境工程学院, 国家环境保护化工过程环境风险评价与控制重点实验室, 上海 200237

• 摘要：2011年12月至2012年11月期间在上海市华东理工大学采样点采集PM_2.5样品,对样品中的水溶性有机碳(WSOC)和类腐殖质碳(HULIS-C)进行了测定,探讨了WSOC和HULIS-C的季节变化特征.结果表明:采样期间PM_2.5、WSOC和HULIS-C的年平均质量浓度分别为(66.19±28.59)、(4.21±1.83)和(2.69±1.36) μg·m^-3,WSOC和HULIS-C分别占PM_2.5质量的6.5%±1.7%和4.1%±1.3%.HULIS-C占WSOC质量的62.8%±11.8%,表明HULIS-C是WSOC的主要成分.WSOC和HULIS-C的质量浓度均具有显著的季节变化特征,呈现冬季>春季>秋季>夏季,而HULIS-C/WSOC比值的季节变化相对较小,其四季平均比值呈现秋冬季略高,春夏季略低的特点.WSOC和HULIS-C质量浓度与能见度、风速呈负相关,与空气污染指数(API)呈显著正相关.WSOC和HULIS-C的浓度水平可能受到多种燃烧源的综合影响,本地燃烧源的贡献不容忽视.此外,在特定气象条件下周边污染源和长距离输送对高浓度WSOC和HULIS-C也会有贡献.

• Abstract：The ambient PM_2.5 samples were collected from December 2011 to November 2012 at the site of East China University of Science and Technology in Shanghai. The concentrations of Water-Soluble Organic Carbon (WSOC) and Humic-Like Substance Carbon (HULIS-C) in PM_2.5 samples were detected. The seasonal variations of WSOC and HULIS-C were investigated. Results indicated that the annual average mass concentrations of PM_2.5, WSOC and HULIS-C were (66.19±28.59), (4.21±1.83) and (2.69±1.36) μg·m^-3, respectively. WSOC and HULIS-C were 6.5%±1.7% and 4.1%±1.3% of PM_2.5 mass concentration, respectively. The concentration of HULIS-C accounted for 62.8%±11.8% of WSOC, which suggested that HULIS-C is the predominant component of WSOC. Both WSOC and HULIS-C mass concentration varied significantly in seasons with the following sequence: winter > spring > autumn > summer. However, less variation of HULIS-C/WSOC ratio was observed among four seasons. Generally, the mean value of HULIS-C/WSOC ratio in autumn and winter was comparatively greater, while lower values occurred in spring and summer. Both WSOC and HULIS-C were found to have negative correlation with visibility and wind speed, but positive correlation with API. WSOC and HULIS-C level might be resulted from the integrated effect of various combustion sources. The contribution from local combustion sources should not be neglected. In addition, surrounding sources and long-distance transportation might contribute to higher concentrations of WSOC and HULIS-C under particular meteorological conditions.

• Key words：PM_2.5  WSOC  HULIS-C  seasonal variation

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