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成都市PM_(2.5)中水溶性无机离子污染特征及来源 被引量:2

Pollution Characteristics and Source of Water-Soluble Inorganic Ions in PM_(2.5) in Chengdu
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摘要 2009—2010年采集成都市城区131个PM_(2.5)样品,用离子色谱法对PM_(2.5)中9种水溶性无机离子(Na^+、NH_4^+、K^+、Mg^(2+)、Ca^(2+)、F^-、Cl^-、NO_3^-和SO_4^(2-))进行分析,探讨其污染特征及来源.分析结果显示:总水溶性无机离子年均质量浓度为(74±53)μg/m^3,占PM_(2.5)质量浓度的44.8%.9种离子的浓度大小顺序为SO_4^(2-)>NO_3^->NH_4^+>Cl^->K^+>Ca^(2+)>Na^+>F^->Mg^(2+).水溶性无机离子浓度季节特征明显,在冬季最高.成都市PM_(2.5)中NO_3^-、SO_4^(2-)和NH4+主要以NH_4HSO_4和NH_4NO_3形式存在;大气PM_(2.5)水溶性离子来源主要有化石燃料与生物质燃烧、土壤尘及工业排放. Daily PM2.5 samples were collected at urban area of Chengdu in four 1-month periods (with each in a different season) during 2009 -2010. The total concentration of major water-soluble inorganic ions (Na^+, NH4^+, K^+, Mg^2+, Ca^2+, F^-, Cl^-, NO3^- and SO4^2-) in PM2.5 was (74±53) μg/m^3, accounting for 44.8% of the PM2.5 mass concentration. Season variation of water-soluble inorganic ions was similar to PM2.5 showing a concentration maximum in winter. The concentrations of these ions showed the order of SO4^2- 〉 NO3^- 〉 NH4^+ 〉 Cl^- 〉 K^+ 〉 Ca^2+ 〉 Na^+ 〉 F^- 〉 Mg^2+. Correlation Analysis and Principal Component Analysis were utilized to identify the chemical characteristics and potential sources of PM2.5. The results showed that most of NO3^- , SO4^2- and NH4^+ in Chengdu existed in the form of NH4HSO4 and NH4NO3. The main sources of PM2.5 included fossil fuels and biomass burning, soil dust, industrial emissions.
出处 《西华师范大学学报(自然科学版)》 2015年第4期387-393,共7页 Journal of China West Normal University(Natural Sciences)
基金 化学合成与污染控制四川省重点实验室项目(CSPC2014-4-2) 四川省科技厅项目(2015JY0094)
关键词 PM2.5 水溶性无机离子 源解析 成都市 PM2.5 water-soluble inorganic ion source apportionment Chengdu
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