摘要
为探究银川市大气降尘中元素的污染特征及来源,文章于2019年5月-2020年4月期间每季度对银川市大气降尘进行采集,计算降尘沉降通量,利用ICP-MS、AAS测定了降尘中48种元素含量并分析其来源。结果表明:银川市沉降通量在0.85~16.3 g/(m^(2)·30 d)之间,冬季达到最低,银川市西北方向监测点的沉降通量高于其他监测点。降尘中元素含量在不同季节差异较大,大部分元素含量在夏季达到最低值。富集因子结果表明As、Bi、Hg、Sb、Sn、W、Pb、Cu、Zn及春、秋、冬季的Mo元素存在轻微富集,Cd及夏季的Mo元素存在中度富集,其他元素不存在富集。主成分分析结果显示,降尘中元素可以分为5类污染源:第1类为自然源,第2类为交通源,第3类为工业源,第4类为扬尘源,第5类为燃煤及垃圾焚烧源。
In order to explore the pollution characteristics and sources of the elements in the atmospheric dust falling,the atmospheric dust falling in Yinchuan was collected quarterly from May 2019 to April 2020.The deposition flux of Yinchuan was calculated,48 elements were determined by ICP-MS and AAS,and their sources were analyzed by enrichment factor method and principal component analysis method.The results showed that the settlement flux is between 0.85 g/(m^(2)·30 d)and 16.3 g/(m^(2)·30 d),reaching the lowest in winter,and the settlement flux in the northwest of Yinchuan is higher than that in other monitoring points.The content of elements in the falling dust varies greatly in different seasons,and most elements reach their lowest value in summer.Enrichment factor results showed that As,Bi,Hg,Sb,Sn,W,Pb,Cu,Zn and Mo in spring,autumn and winter were slightly enriched,while Mo in summer and Cd were moderately enriched,while other elements were not enriched.The results of principal component analysis showed that the elements in the falling dust in Yinchuan City can be divided into five pollution sources:the first is natural sources;the second is the source of traffic;the third category is industrial sources;the fourth is the dust source,and the fifth type is coal burning and waste incineration.
作者
开建荣
王彩艳
牛艳
李彩虹
左忠
KAI Jianrong;WANG Caiyan;NIU Yan;LI Caihong;ZUO Zhong(Ningxia Research Institute of Quality Standards and Testing Technology of Agricultural Products,Yinchuan 750002,China;Institute of Desertification Control,Ningxia Agriculture and Forestry Academy,Yinchuan 750002,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2020年第12期96-103,共8页
Environmental Science & Technology
基金
宁夏防沙治沙与水土保持重点实验室开放基金项目(KF1902)
自治区全产业链创新示范项目(QCYL-2018-06)
退耕还林工程生态效益监测及宁夏回族自治区第六批科技创新领军人才项目。
关键词
银川市
沉降通量
元素
源解析
Yinchuan City
deposition flux
elements
source apportionment
