成都市PM 10 中碳质气溶胶长期来源特点

Q2 Environmental Science

环境科学研究 Pub Date : 2018-03-25 DOI:10.13198/J.ISSN.1001-6929.2017.03.93

关辽, 杨卓然, 马彤, 宋丹林, 田瑛泽, 冯银厂

引用次数: 0

摘要

Atmospheric particulate matter contains multiple components of aerosols, among which carbon aerosols have received increasing attention due to their significant impact on human health and visibility. To study the long-term changes of carbon aerosols, PM10 samples from Chengdu from 2009 to 2013 were collected and their inorganic elements, water-soluble ions, and carbon components were measured, And the "PMF (Positive Definite Matrix Factorization) Ratio" model was used to analyze the sources of PM10 and the carbon aerosols contained in it. The results showed that the carbon aerosol concentrations were higher in January, February, May, and December, with higher OC/EC (organic carbon to elemental carbon mass concentration ratio) in January, February, and December, and the PMF Ratio model calculation results also showed an increase in winter SOC, Indicating that there may be more secondary organic carbon (SOC) generation in winter; In May, the char EC/soot-EC (mass concentration ratio of char EC=EC1-OP, soot-EC=EC2+EC3, which can better distinguish source types) was higher, and the K content was also higher, indicating that there may be more biomass combustion emissions. PM10 analysis revealed a total of 6 types of sources, followed by crustal dust (26.5%), secondary sulfate (25.1%), coal and biomass combustion mixed sources (17.3%), secondary nitrate and secondary organic carbon mixed sources (12.3%) Motor vehicle sources (11.8%) and cement dust sources (7.0%); Analysis of carbon aerosols revealed that the main sources of OC were motor vehicle sources (38.2%), coal-fired biomass combustion mixed sources (33.1%), and secondary organic carbon (25.3%). The main sources of char EC were coal-fired biomass combustion mixed sources and motor vehicle sources, accounting for 50.5% and 45.4%, respectively. Soot EC was mainly affected by motor vehicles (up to 73.2%). Research shows that PM10 in Chengdu mainly comes from crustal dust, secondary generation, and coal-fired biomass combustion, Carbon aerosols mainly come from motor vehicles, coal-fired and biomass combustion

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成都市PM 10 中碳质气溶胶长期来源特点

大气颗粒物中包含多种组分的气溶胶，其中碳质气溶胶由于对人体健康、能见度有较大影响，已受到越来越多的关注.为研究碳质气溶胶的长期变化规律，采集了成都市2009—2013年的PM10样品，对其中所含的无机元素、水溶性离子及碳组分分别进行测定，并使用“PMF（正定矩阵因子分解法）-比值”模型分别对PM10和所含的碳质气溶胶的来源进行分析.结果表明，1月、2月、5月和12月的碳质气溶胶浓度较高，其中1月、2月和12月的OC/EC（有机碳与元素碳质量浓度之比）较高，并且PMF-比值模型计算结果也显示冬季SOC增多，表明冬季可能有更多的二次有机碳（SOC）生成；5月的char-EC/soot-EC（二者质量浓度之比，其中char-EC=EC1-OP，soot-EC=EC2+EC3，它们可更好地区分源类）较高，K含量也较高，表明可能有更多的生物质燃烧排放.PM10解析共发现6类源，依次为地壳扬尘（26.5%）、二次硫酸盐（25.1%）、燃煤&生物质燃烧混合源（17.3%）、二次硝酸盐&二次有机碳混合源（12.3%）、机动车源（11.8%）和水泥尘源（7.0%）；碳质气溶胶解析发现，OC主要来源依次为机动车源（38.2%）、燃煤&生物质燃烧混合源（33.1%）和二次有机碳（25.3%），char-EC的主要来源是燃煤&生物质燃烧混合源和机动车源，分别占50.5%和45.4%，soot-EC则主要受机动车影响（达73.2%）.研究显示，成都市PM10主要来自于地壳扬尘、二次生成和燃煤&生物质燃烧，而碳质气溶胶主要来自于机动车、燃煤&生物质燃烧.

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来源期刊

环境科学研究 Environmental Science-Environmental Science (miscellaneous)

CiteScore

3.80

自引率

0.00%

发文量

6496

期刊介绍：