摘要
2013年6月-2014年5月在贵阳市以每24h为一个混合样连续采集了357个大气PM2,样品,采用Lumex测汞仪(RA-915塞曼效应汞分析仪和配套PYRO.915热解装置),分析了颗粒物PM2.5,汞浓度,并结合HOBOU30气象仪同步记录气象数据分析汞的浓度变化。结果表明,贵阳市全年大气颗粒物PM2.5,汞日浓度在11~2560Pg·m-2,平均值为104x85Pg·m-2,其中12、1月份颗粒态汞浓度较高,7月份最低,全年有164d超过全球背景值。以季节划分来看,全年季节平均值为107-60Pg·m-2,存在季节性差异,表现为:夏季〈秋季〈春季〈冬季,明显受风向、风速和降雨等气象参数影响,春、秋、冬季节以东北风为主风向,存在明显污染源,同时冬季降雨量小,污染物聚集,导致冬季污染最高,夏季以南风为主风向,风速大,降雨量大,因此汞浓度夏季最低。结合气象因素初步分析得出,颗粒态汞幸罢来源干燃煤与工业排放.与国内现有耜措数据相比较.处于轻度污染水平.
A total of 367 twenty-four hour composited particulate matter ( PM25 ) samples werecontinuously collected in Guiyang City from June 2013 to May 2014. Meteorological data weresimultaneously recorded by HOBO U30. Mercury (Hg) concentrations in PM2+ samples weremeasured by using Lumex with a Zeeman atomic absorption spectrometer (ZAAS). Resultsshowed that the daily concentrations of Hg in PM2.5 ranged from 11 to 2560 pg · m-3 with an aver-age of 104±85 pg ·m-3. The highest concentrations of Hg in PM2.5 were found in December andJanuary and the lowest in July. An obvious seasonal variation was observed as : summer 〈 autumn 〈spring 〈 winter. The anthropogenic sources from northeastern wind as well as the scarcity of pre-cipitations resulted in high levels of Hg in PM2.5 in winter. Compared with the investigated resultsin China' s other cities, the present study shows a lower level of particulate Hg pollution in Guiy-ang
出处
《生态学杂志》
CAS
CSCD
北大核心
2015年第2期510-515,共6页
Chinese Journal of Ecology
基金
贵阳市科技计划项目(筑科合同[2011401]社6-3号)
贵阳市科技计划项目(筑科合同[2012303]14号)资助