Atmospheric Particulates (PM_2.5) Pollution Features And Sources Apportionment Around Shenzhen University Town

Atmospheric particulate pollution has become the important problem of atmospheric pollution, in order to reflect the shenzhen PM_2.5 the pollution status, in this study, the choice of Shenzhen university Town scope as monitoring area. Using PM_2.5 comprehensive sampling, the ion chromatography, atomic absorption, spectrophotometer, gas chromatography mass spectrometry research methods, research the mass concentration level, chemical composition, sources, etc. of PM_2.5 around Shenzhen university Town range. Obtained as follows conclusions:(1) Pollution characters of PM_2.5 mass concentration: Year-round particle concentration winter>autumn>spring>summer, highest PM_2.5 average concentration appeared in winter 102.9 ug/m³, autumn and spring next in, respectively 87.1 ug/m³ and 86.3 ug/m³ , lowest in summer 35.81 ug/m³. Wind speed is the main factors influence particulate diffusion migration, and visibility directly affected by the particle concentration effect.(2) Water-soluble ionic contamination features: NH₄⁺, NO₃^- and SO₄^2- were the main components of water-soluble ionic components, in spring NH₄⁺ night concentration is higher, in autumn, K⁺, Ca²⁺ and Mg²⁺ whole are higher than other ion concentration, basically from soil source and architectural source.Maritime climate lead to high Na⁺ content outside in summer, water-soluble ionic components constitute relatively stable in other seasons, eight kinds of ion to assume the main parts of the ionic contamination.[NO₃^-]/[SO₄^2-] ratio of the four seasons are not high, overall, should belong to motor vehicle exhaust emissions and combustion dust emissions have certain contribution for hybrid pollution.(3) PAHs contaminated features and sources apportionment: The diurnal variation rule of PAHs is day < night, as the same as the diural variation rule of particulate mass concentration. Sources apportionment using ratio method shows that monitoring area of atmospheric particulate pollution source belongs to with motor and combustion mixed pollution type. Sources apportionment using features compound method shows that the main pollution sources such as soil source close to share rate of 17% or so, building source occupies more than 20% and burning source around 15% level, motor source close to 14%.