张家港市大气PM_(2.5)中元素成分特征

Characteristics of elements in atmospheric PM_(2.5) in Zhangjiagang City

目的为了解张家港市大气细颗粒物(PM_(2.5))中元素浓度水平及污染特征。方法 2015年每月10—16日对张家港市大气PM_(2.5)样品进行采集,采用重量法检测PM_(2.5)浓度,电感耦合等离子体质谱(ICP-MS)法分析PM_(2.5)中12种元素含量并用富集因子法分析污染特征。结果张家港市大气PM_(2.5)中含量前5位的元素依次是Al 117.39 ng/m^3、Pb 49.37 ng/m^3、Mn 32.20 ng/m^3、As 4.66 ng/m^3、Ni 3.81 ng/m^3。Hg、Se、Cd等元素富集因子大于10,属于高度富集级别,锑、铅富集因子在10~5之间,属于轻富集级别。结论 Hg、Se、Cd、Sb、Pb等5种金属是张家港市大气PM_(2.5)中的主要金属污染物,主要是人类活动引起的各种污染所致。

[Objective]To understand the concentrations and pollution characteristics of elements in atmospheric fine particles matter（PM_（2.5））in Zhangjiagang City. [Methods]Aerosol samples of PM_（2.5）were collected in Zhangjiagang City from 10 th to 16 th each month in 2015. The concentrations of PM_（2.5）were measured by filter membrane weighting method. The concentrations of 12 elements in PM_（2.5）were determined by inductively couple plasma-mass spectrometry（ICP-MS）,and the pollution characteristics were analyzed by enrichment factor（EFs）method.[Results]The top five elements in atmospheric PM_（2.5）of Zhangjiagang City were aluminum 117.39 ng/m^3,lead 49.37 ng/m^3,manganese 32.20 ng/m^3,arsenic 4.66 ng/m^3,and nickel 3.81 ng/m^3. The enrichment factors of mercury,selenium,cadmium were higher than 10,which belonged to high-enrichment group. The enrichment factors of antimony and lead were between 10-5,which belonged to low-enrichment group. [Conclusion]Mercury,selenium,cadmium,antimony and lead are the major metal pollutants in atmospheric PM_（2.5） in Zhangjiagang City,and are produced by a variety of pollution caused by human activities.