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Source Apportionment of Rare Earth Elements in PM2.5 in a Southeast Coastal City of China

Category: Aerosol and Atmospheric Chemistry

Article In Press
DOI: 10.4209/aaqr.2017.12.0559
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Gongren Hu1, Shanshan Wang1, Ruilian Yu 1, Zongwei Zhang1, Xiaoming Wang2

  • 1 College of Chemical Engineering, HuaQiao University, Xiamen 361021, China
  • 2 Analytical Laboratory of Beijing Research Institute of Uranium Geology, Beijing 100029, China

Highlights

Rare earth elements in PM2.5 in Quanzhou City are analyzed for the first time.
Ternary diagrams and Nd isotope are used for investigating the main provenance.
REEs mainly derived from other sources except for soil dust.
REEs in PM2.5 in Quanzhou undergoes the largest influence from traffic source.


Abstract

In order to study the geochemical characteristics and sources of rare earth elements (REEs) in the PM2.5 in Quanzhou City, 116 PM2.5 samples were collected from three functional areas in the city during each season. The REE compositions and distribution patterns were then analyzed, together with ternary diagrams, to investigate the main provenance of these elements. Additionally, the sources of PM2.5 were traced using a diagram of the Nd isotope ratio versus REE characteristics. The concentrations of the total rare earth elements (ΣREE), total light rare earth elements (ΣLREE) and total heavy rare earth elements (ΣHREE) in the PM2.5 vary across both the four seasons (summer > spring > winter > autumn) and different functional areas (residential and industrial area > residential and commercial area > scenic area). There are significant correlations between ΣREE in the PM2.5 and the PM2.5 mass concentration in spring, summer and winter but none in autumn. The chondrite-normalized REE patterns in the PM2.5 and potential-source samples are all rightward inclined, with the enrichment of LREE relative to HREE, and display obvious negative Eu anomalies. Results of the La-Ce-Sm diagram demonstrate that the REEs in the PM2.5 of all functional areas are mainly derived from sources other than soil dust. The sources of REEs in the PM2.5 across the four seasons and the reasons for spatial differences in the REEs across various functional areas can be determined via the La-Ce-V ternary diagram. The diagram of 143Nd/144Nd versus LREE/HREE suggests that the levels of REEs in the PM2.5 in Quanzhou City are mainly affected by vehicle exhaust, followed by coal combustion and construction dust, and less influenced by soil dust and steelworks emissions.

Keywords

PM2.5 Rare earth elements Nd isotope Geochemical characteristics Source analysis


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Accepted Manuscripts
DOI: 10.4209/aaqr.2018.04.0129
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