| Inhalable particulate matter (PMio) in water-soluble inorganic ions and metallic element pollutants is the main form of urban air pollution one of the PMio and the metal element and the physical and chemical characteristics of water-soluble inorganic ions for the relevant departmentsthe development of air pollution control measures to improve the quality of life for urban residents, with the guidance of theoretical significance and practical value.In this study, Anderson9level biological percussive sampling through field sampling, experimental analysis and mathematical statistics methods to Nanjing in2009and2010in different seasons of PM10in water-soluble inorganic ions and metal element pollutants, the main object of study, PM10, PM10and pM2.1in the water-soluble ion spatial and temporal distribution characteristics and parse its source; create a system of metallic elements in atmospheric particulate matter fractionation analysis of the detection methods, analysis of metal elements in particle size spectrum distribution;water-soluble inorganic ions in PM10characteristics of temporal variation and source characteristics, revealing its pollution transformation mechanism, and various sources on the component of particle contribution rate by factor analysis. The main conclusions are as follows:(1) The average PM10concentrations in the autumn of sampling points were0.228mg/m3and0.189mg/m3peak concentrations were0.443mg/m3and0.634mg/m3, that Nanjing PM10pollution is more serious. Two sampling PM10concentrations a correlation coefficient of0.927, showed that the suburbs may exist between PM10regional pollution. Two sampling points ion the total mass of PM10is26.8%and46.5%,34.2%and49.5%, indicating that the water-soluble inorganic ions is an important part in the Nanjing PM10.(2)PM10and elements of various cations showed a bimodal distribution of particle size distribution, mainly distributed in fine particles, and are greater than during the day and night. Use factor analysis to source apportionment, northern suburb of Nanjing, the main component of PM10from the metal smelting, construction dust, etc., these sources of PMio in the cation and the contribution rate of46.81%element; Nanjing, a major suburb PM2.1components from metal smelting, secondary non-ferrous metal manufacturing and fuel dust, metal fabrication class sources of PM2.1contribution rate of46.81%.(3) use a different solvent sequential extraction pretreatment atmospheric respirable particulate matter in the metal element to the success of the metallic element separated according to different chemical forms. Take ICP-the IRIS technology can simultaneous determination of13kinds of metal elements in the fine particles, the Nanjing different seasonal atmospheric particulate matter concentration, both said the bimodal distribution of water-soluble ion concentrations in winter than summer and fall, inhalable particulate matter in13kinds of metal elements The content except Cd outside winter significantly higher than in summer.13kinds of metal elements are mostly adsorbed on the PM2.1. |
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