Lead chromate detected as a source of atmospheric Pb and Cr (VI) pollution

Title
Lead chromate detected as a source of atmospheric Pb and Cr (VI) pollution
Authors
장혜정조혜영Pyeong-Koo LeeSoonyoung YuMin-Ju KangByung-Gon Chae
Keywords
atmospheric pollution; EDS; heavy metal; micro dust; PbCrO; TEM
Issue Date
2016-10
Publisher
Scientific Reports
Citation
VOL 6, 36088
Abstract
Spherical black carbon aggregates were frequently observed in dust dry deposition in Daejeon, Korea. They were tens of micrometers in diameter and presented a mixture of black carbon and several mineral phases. Transmission electron microscopy (TEM) observations with energy-dispersive X-ray spectroscopy (EDS) and selected area diffraction pattern (SADP) analyses confirmed that the aggregates were compact and included significant amounts of lead chromate (PbCrO4). The compositions and morphologies of the nanosized lead chromate particles suggest that they probably originated from traffic paint used in roads and were combined as discrete minerals with black carbon. Based on Pb isotope analysis and air-mass backward trajectories, the dust in Daejeon received a considerable input of anthropogenic pollutants from heavily industrialized Chinese cities, which implies that long-range transported aerosols containing PbCrO4 were a possible source of the lead and hexavalent chromium levels in East Asia. Lead chromate should be considered to be a source of global atmospheric Pb and Cr(VI) pollution, especially given its toxicity.
URI
http://pubs.kist.re.kr/handle/201004/70183
ISSN
2045-2322
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KIST Publication > Article
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