镇江市东部片区大气细颗粒物中水溶性离子在线监测成分特征研究

2019年1—6月之间利用MARGA离子在线分析仪在镇江东部地区对细颗粒物中主要水溶性离子组分NH4+,Na+,K+,Ca2+,Mg2+,Cl3-,NO3-,SO42-进行在线监测,结果表明,细颗粒物中阴阳离子的当量浓度的频数分布趋势基本一致。通过相关性系数分析可知,NO3-和SO42-存在显著相关性,表明与燃料燃烧有一定关系;Na+和K+存在显著相关性,生物质燃烧可能为其共同来源;Mg2+和Ca2+相关性也较强,表明可能来自于土壤扬尘。整体上镇江市东部地区点位受扬尘影响较小,受工业排放、机动车尾气和燃料燃烧影响较大。

From January to June 2019,the main water-soluble ion components NH4+,Na+,K+,Ca2+,Mg2+,Cl-,NO3-,SO42-in the east of Zhenjiang were monitored on-line by using the MARGA ion on-line analyzer.The results show that the frequency distribution trend of the equivalent concentration of anion and anion in the fine particles is basically the same.Through the correlation coefficient analysis,NO3-and SO42-have a significant correlation,indicating that there is a certain relationship with fuel combustion.There is a significant correlation between Na+and K+,and biomass combustion may be the common source.The correlation between Mg2+and Ca2+is also strong,indicating that it may come from soil dust.On the whole,the eastern area of Zhenjiang city is less affected by dust,and more affected by industrial emissions,vehicle exhaust and fuel combustion.