【摘要】 于2017年3月1日—5月31日监测分析了连云港市大气PM_2.5中主要水溶性无机离子质量浓度的日变化规律,以及与气象因子、PM10、PM_2.5相关性。结果表明,水溶性无机离子质量浓度与环境空气中NO₂、CO、PM₁₀、PM_{2. 5}显著相关,与气温、风速、能见度等呈负相关;日变化呈明显单峰型,峰值出现在08:00左右;水溶性无机离子季度均值为27. 2μg/m³,占ρ(PM_2.5)平均50%左右,ρ（NO₃^-）、ρ(SO₄^2-)和ρ（NH₄⁺）占ρ（水溶性无机离子）总85%以上;指出,SO₄^2-主要受远距离传输的影响,NO₃^-和NH₄⁺主要受局地源的影响。更多还原

【Abstract】 One-hour average concentrations of main water-soluble inorganic ions（ WSII） in PM_2.5 collected from multi-parameter stations were investigated in the urban district of Lianyungang from March 1 st to May 31 st,2017. Correlation analysis combined with meteorological parameters and gaseous pollutants were conducted furtherly. The results showed that the mass concentration of WSII had significant positive correlations with that of NO₂,CO,PM₁₀ and PM_2.5,and had negative correlations with the temperature,wind velocity and visibility. Diurnal variation presented single peak type,and the maximum concentration occurred at 8: 00 AM.The quarterly average mass concentration of WSII was 27. 2 μg/m³,accounting for about one half of the PM_2.5 mass concentration.The main chemical compositions of WSII in PM_2.5 were NO₃^-,SO₄^2-and NH₄⁺,accounting for more than 85% of the mass concentration of total WSII. The pollution of SO₄^2-were mainly affected by long distance transmission,in addition,the NO₃^- and NH₄⁺ pollution was mainly induced by local sources.更多还原