摘要
为掌握贵阳市污染源PM_(2.5)中铂族元素(PGE)的分布特征,采集7类主要污染源42个PM_(2.5)样品,采用同位素稀释/电感耦合等离子体质谱法定量测定PGE中铂(Pt)、钯(Pd)、铑(Rh)的含量。结果表明:(1)金属冶炼尘PM_(2.5)中Pt、Pd、Rh平均值分别为2186.136、1239.827、346.172 ng/g,高于燃煤尘(219.001、475.532、23.238 ng/g)、汽车尾气尘(297.877、329.866、74.760 ng/g)和其他污染源,可能是造成贵阳市大气PM_(2.5)中PGE污染的主要原因。(2)土壤尘PM_(2.5)中Pt、Pd、Rh平均值高于未污染土壤背景值,是土壤背景值的8.58、97.56、36.92倍,表明研究区域土壤样品已受到人为污染。(3)在同一道路红绿灯路口的Pt、Pd、Rh平均值均比无红绿灯路段高,这与红绿灯路口车流量大且车辆常处于怠速行驶状态有关。
In order to reveal distribution characteristics of platinum group elements(PGE)in PM_(2.5) fraction of different pollution sources in Guiyang,a total of 42 PM_(2.5) samples of seven major pollution sources were collected,respectively.Three PGE(Pt,Pd,Rh)in the samples were determined by the isotope dilution method based on inductivly coupled plasma mass spectrometry.The results showed that:(1)the average concentrations of Pt,Pd and Rh were 2186.136,1239.827,346.172 ng/g in PM_(2.5) of metal smelting dust,respectively,which were significantly higher than those in coal combustion dust(219.001,475.532,23.238 ng/g,respectively),vehicle emissions dust(297.877,329.866,74.760 ng/g,respectively)and other pollution sources,could be the main cause of PGE pollution in atmospheric PM_(2.5) in Guiyang.(2)The average concentrations of Pt,Pd and Rh in PM_(2.5) of soil dust were 8.58,97.56,36.92 times of the background values of uncontaminated soil,indicating that soil samples in the study area had been contaminated by human activities.(3)The average concentrations of Pt,Pd and Rh at traffic light intersections were higher than those without traffic lights in the same road,which was related to the large traffic flow and idle driving condition at the traffic light intersection.
作者
李小成
董娴
柳亚龙
张梦君
陈卓
LI Xiaocheng;DONG Xian;LIU Yalong;ZHANG Mengjun;CHEN Zhuo(College of Chemistry and Material Science,Guizhou Normal University,Guiyang Guizhou 550001;Key Laboratory of Atmospheric Fine Particles and Air Pollution Chemistry of Guiyang City,Guiyang Guizhou 550001)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2022年第2期212-217,共6页
Environmental Pollution & Control
基金
国家自然科学基金资助项目(No.21767007)
贵州省科学技术基金资助项目(黔科合基础〔2018〕1111)
贵州省科技计划项目(黔科合平台人才〔2017〕5726)
江苏省机动车尾气污染控制重点实验室开放项目(No.2019-OVEC54)。
关键词
贵阳市
污染源
PM_(2.5)
铂族元素
分布特征
Guiyang
pollution source
PM_(2.5)
platinum group elements
distribution characteristics
