桂林市细颗粒物部分典型排放源的粒径谱及成分分析

采用在线单颗粒气溶胶质谱技术源解析方法,对桂林市PM2.5典型排放源的粒径和化学成分进行质谱分析,采集燃煤/燃气源、工业工艺源、扬尘源、油烟源4类共计7个典型排放源。结果表明,桂林市4类排放源细颗粒物的粒径分布为0.25~1.25μm,80%以上的细颗粒分布在0.2~1.0μm的小粒径范围,峰值约0.68μm。细颗粒物离子成分含有Na~+、Mg~+、K~+、NH~+4、Fe~+、Pb~+、Cd~+、V~+、Mn~+、Li~+、Al~+、Ca~+、Cu~+、Zn~+、Cr~+、CN~-、PO_3~-、NO_2~-、NO_3~-、Cl~-、SO_4~(2-)、SiO_3~-等成分,桂林市细颗粒物为元素碳、有机碳元素碳、有机碳、富锰颗粒、富铁颗粒、富钾颗粒、矿物质、左旋葡聚糖以及其他金属等9类。

Particle Size Spectra and Chemical Composition Analysis of Some Typical Emission Source from PM2.5 in Guilin

PM2.5 of four categories were collected from seven typical emission sources in Guilin , such as coal-fired/gas source, in-dustrial process source, dust source, and soot source.The particle size and chemical composition of PM 2.5 were analyzed using source apportionment of on-line single-particle aerosol mass spectrometry .The results showed that the particle size distribution of PM2.5 of four category emission sources was between 0.25 μm and 1.25 μm, and more than 80%of PM2.5 distributed in the range of 0.2 ~1.0 μm, which peaks at about 0.68 μm.Ionic components of PM2.5 contained Na +, Mg+, K+, NH4 +, Fe+, Pb+, Cd+, V+, Mn+, Li+, Al+, Ca+, Cu+, Zn+, Cr+, CN-, PO3-, NO2-, NO3-, Cl-, SO2-4 , SiO3-, etc.PM2.5 in Guilin in-cluded nine classes, such as elemental carbon, organic carbon elemental carbon, organic carbon, manganese-rich particles, iron-rich particles, potassium-rich particles, minerals, L-glucan and other metals.