Characteristics of hazardous trace elements in PM2.5 in urban area of Chengdu

doi:10.7523/j.issn.2095-6134.2014.03.019

Abstract

Abstract:

Daily PM_2.5 samples were collected during the typical month of each season of 2011 at an urban site of Chengdu. 32 elements were detected in PM_2.5 by ICP-MS, among which there were 9 hazardous elements. The concentrations, enrichment factors, and possible sources of the 9 elements were analyzed in this study. The annual average concentrations of Pb,Mn,As,Cr,Sb,Cd,Se,Ni, and Co were (171.7±86.2), (66.4±36.7), (19.8±11.1), (9.2±5.0), (6.5±4.2), (3.5±1.9), (2.7±1.2), (2.5±1.6), and (0.5±0.3) ng·m^-3, respectively. The As concentrations in most of the collected samples exceeded the guideline values provided by WHO and Chinese ambient air quality standards. High enrichment factors of Se,Cd,Sb,Pb, and As were found, ranging from 492 to 5340. Relatively low enrichment factors were observed for all the hazardous elements during spring, since the ambient aerosol was significantly affected by soil dust. The results of the factor analysis further revealed that these hazardous elements were mainly contributed by anthropogenic sources such as motor vehicle emissions, coal combustion, and metal smelting.

Key words: PM_2.5, hazardous trace elements, heavy metals, Chengdu

CLC Number:

X513

ZHANG Zhisheng, TAO Jun, LONG Yingxian, LIN Zejian. Characteristics of hazardous trace elements in PM_2.5 in urban area of Chengdu[J]. Journal of University of Chinese Academy of Sciences, 2014, 31(3): 426-430.

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Characteristics of hazardous trace elements in PM_2.5 in urban area of Chengdu

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