沈阳市大气PM_2.5中重金属的分布与来源解析

【摘要】 于采暖期（2020 年 12 月）和非采暖期（2021 年 4 月）在沈阳市采集大气 PM_2.5样品，分析其所含重金属的浓度特征、空间分布与来源。结果表明，采暖期重金属浓度依次为 Zn>Pb>As>Cu>Cr>Cd>Hg；非采暖期依次为 Zn>Pb>Cr>Cu>As>Cd>Hg；采暖期采样点 U,S,N 的重金属含量普遍较高，非采暖期采样点 T,U,N 较高；PMF 分析的主要贡献源为燃煤源、工业源、机动车尾气排放以及扬尘源。更多还原

【Abstract】 The PM_2.5samples were collected in Shenyang during heating period （December 2020）and non-heating period （April 2021）to analyze the concentration characteristics,spatial distribution and sources of heavy metals. The results showed that the concentration of heavy metals in heating period is in the order of Zn > Pb > As > Cu > Cr > Cd >Hg. The order of non-heating period is Zn > Pb > Cr > Cu > As > Cd > Hg. In heating period,the contents of heavy metals in U^#,S^#and N^#sampling points are generally higher;while in non-heating period,the contents in T^#,U^#and N^#are higher. The main contribution sources of PMF analysis are coal burning sources,industrial sources,vehicle exhaust and dust sources.更多还原