摘要
对西安市夏季PM2.5中6种重金属元素的化学形态进行分析,并研究了模拟酸雨淋溶条件下PM2.5中6种元素的释放过程。结果表明,近80%的Cr和Fe分布在有机质、氧化物、硫化物结合态和残渣态中,Cd在大气环境中的化学性质很活泼,具有很强的毒害性,Pb、As、和Hg 3种元素主要以碳酸盐态、可氧化态与可还原态存在于环境中;PM2.5中6种元素均有不同程度的释放,Cd释放率高于其他元素,Fe释放率最低,pH降低有利于颗粒物中重金属元素的释放。
The chemical speciations of six kinds of heavy metals in PM2.5 were quantified,which were collected in Xi＇an city in summer.Also,the release processes of these elements in simulated acid rain were studied.Results showed that nearly 80％ of Cr and Fe were found bound to organic matter,oxidisable and sulphidic fraction,and residual fraction.Cd was very active and toxic in the atmosphere.Pb,As and Hg were mainly distributed in carbonate,oxide and reducible fraction in environment.Release rates of six elements in PM2.5 were different in simulated acid rain.The release rate of Cd is greatest and Fe is lowest.The release rates of heavy metals in PM2.5 were increased as the pH of the acid rain decreased.
出处
《中国环境监测》
CAS
CSCD
北大核心
2013年第5期53-57,共5页
Environmental Monitoring in China
基金
陕西省自然科学基金(2007D20)
陕西省教育厅专项科研基金(06JK268)
关键词
PM2
5
重金属
化学形态
模拟酸雨
PM2.5
heavy metal
chemical speciation
simulated acid rain
