摘要
为了确定深圳市郊区大气中PM2.5的污染特征,本研究分析了2009年和2010年夏季和冬季PM2.5样品中的水溶性离子和多环芳烃成分.结果表明,深圳市郊区大气中PM2.5的质量浓度很高,夏季53.9%和冬季100%的样品超过了WHO的大气质量准则浓度.PM2.5中,冬季最主要的3种离子是SO24-、NO3-和NH4+.在夏季,这3种离子在PM2.5中的含量都会减少,而Cl-、Na+、K+、Ca2+和Mg2+的含量会增多.另外,冬季是多环芳烃浓度较高的季节,其中萘、苊烯、苊和苯并荧蒽是冬季PM2.5中多环芳烃的主要成分.本研究还通过比值法和特征化合物法对深圳市郊区大气中的PM2.5进行了源解析,确定了PM2.5的可能来源.
In this study,PM2.5 samples had been measured from the summer of 2009 to the winter of 2010 in a suburb of Shenzhen.The results indicated serious PM2.5 pollution in the suburb of Shenzhen.Seasonal and daily variations of water-soluble ions were discussed.SO2-4,NO-3 and NH+4 were the most abundant ions in winter.In summer,the average contributions of Cl-,Na+,K+,Ca2+ and Mg2+ increased significantly,while SO2-4,NO-3 and NH+4 decreased.Furthermore,Naphthalene,acenaphthylene,acenaphthene and benzo fluoranthene were the major PAHs in PM2.5.Ratio analysis and characteristic compounds analysis were also used to determine the possible sources of PM2.5 in the suburb of Shenzhen.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2012年第6期1952-1957,共6页
Environmental Science
关键词
PM2.5
水溶性离子
多环芳烃
变化规律
源解析
PM2.5
water-soluble ions
PAHs
seasonal and daily variations
source identification
