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Characteristics, Sources, and Health Risk Assessment of Trace Elements in PM10 at an Urban Site in Chengdu, Southwest China

Category: Urban Air Quality

Accepted Manuscripts
DOI: 10.4209/aaqr.2017.03.0112
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Xin Cheng1,2, Yi Huang 1,2, Shi-Peng Zhang2, Shi-Jun Ni1,2, Zhi-Jie Long2

  • 1 Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province (Chengdu Uni-versity of Technology), Chengdu, Sichuan 610059, China
  • 2 Colleges of Earth Science, Chengdu University of Technology, Chengdu, Sichuan 610059, China

Highlights

Concentrations of 19 trace elements in PM10 were measured.
Temporal variations of 17 particulate trace elements were analyzed.
Sources identification of trace elements in PM10 was conducted.
Individual particles morphological characteristics were analyzed.
Health risk from hazard metals were assessed.


Abstract

To investigate trace element pollution of PM10 in urban Chengdu, a Southwest megacity of China, as well as to assess the human health risks caused by exposure to PM10, we analyzed ambient PM10 samples collected at an urban site in Chengdu from November, 2014 to October, 2015. The annual mean concentration of PM10 in the sampling period was 173.6 ± 77.9 µg m–3, which is 2.5 times higher than the national recommended standard of 70 µg m–3. The mean metals content in PM10 was in the following order: iron (Fe) > zinc (Zn) > titanium (Ti) > copper (Cu) > manganese (Mn) > lead (Pb) > barium (Ba) > chromium (Cr) > strontium (Si) > nickel (Ni) > arsenic (As) > vanadium (V) > antimony (Sb) > cobalt (Co) > cadmium (Cd) > bismuth (Bi). The concentration of As in PM10 was observed to be 2.9 times higher than the secondary level recommended by the China National Ambient Air Quality Standard (GB3095-2012), whereas the concentrations of other metals were within the limit. Enrichment factor analysis indicated that As, Pb, Zn, Cu, Cd, and Sb mainly originated from anthropogenic sources. Five factors were identified by positive matric factorization (PMF) model. The sources identified were soil dust (48.4%), road dust (19.4%), fossil fuel combustion (14.9%), electroplating industry (13.8%), and metallurgy industry (3.5%). Particle morphology and chemical composition analysis revealed six major particle types, namely alum inosilicate, sulfur-containing, carbon-containing, chlorine-containing, biomass burning, and metal particles. The results of the health risk assessment indicated that Cr can be carcinogenic to both children and adults, and other trace elements were determined to be below the legislation threshold (Environmental Protection Agency limit values), except for As, which was observed to be above the threshold.

Keywords

PM10 Trace elements Seasonal variation Source apportionment Health risk


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