湖北孝感不同类型扬尘中黑碳的污染特征及来源分析

Pollution characteristics and potential sources of black carbon in different types of fugitive dusts in Xiaogan,Hubei

在湖北孝感采集5种不同类型扬尘(道路尘、大气降尘、堆场尘、土壤尘和建筑尘)样品45个,并采用热光反射法测定其黑碳(BC)、焦炭和烟炱浓度。结果表明:(1)孝感扬尘中BC质量浓度为0.02~10.65 g/kg,平均值为1.45 g/kg,BC平均值表现为道路尘>土壤尘>建筑尘>大气降尘>堆场尘。(2)BC和总有机碳(TOC)、焦炭和烟炱质量比平均值分别为0.34、1.92,表明化石燃料和生物质燃烧是BC的主要来源。(3)孝感扬尘中BC与TOC、焦炭、烟炱均有显著的正相关性,BC的主要贡献来源是焦炭。

A total of 45 samples of five different types of fugitive dusts(road dust,atmospheric dustfall,storage yard dust,soil dust and construction dust)were collected in Xiaogan,Hubei.The contents of black carbon(BC),char,and soot were measured by thermal-optical reflectance(TOR)method.The results indicated that:(1)BC content in the fugitive dusts of Xiaogan was 0.02-10.65 g/kg,with an average value of 1.45 g/kg.The five different types of fugitive dusts followed a order of road dust>soil dust>construction dust>atmosphere dustfall>storage yard dust in terms of mean BC concentration.(2)The mean values of BC/TOC and char/soot mass ratios in the fugitive dust were 0.34 and 1.92,respectively,indicating that burning of fossil fuels and biomass were both sources of BC.(3)Significant positive correlation was observed between BC and TOC,char and soot in the fugitive dusts.According to the slope of the linear fitting equation,it was suggested that the main contribution source of BC in fugitive dusts was char.