Characterization of concentration, particle size distribution, and contributing factors to ambient hexavalent chromium in an area with multiple emission sources

Atmospheric Environment
Chang-Ho YuZhi-Hua Tina Fan

Abstract

Airborne hexavalent chromium (Cr(VI)) is a known pulmonary carcinogen and can be emitted from both natural and anthropogenic sources, including diesel emissions. However, there is limited knowledge about ambient Cr(VI) concentration levels and its particle size distribution. This pilot study characterized ambient Cr(VI) concentrations in the New Jersey Meadowlands (NJ ML) district, which is close to the heavily trafficked New Jersey Turnpike (NJTPK) as well as Chromium Ore Processing Residue (COPR) waste sites. Monitoring was simultaneously conducted at two sites, William site (~50 m from NJTPK) and MERI site (~700 m from NJTPK). The distance between the two sites is approximately 6.2 km. Ambient Cr(VI) concentrations and PM2.5 mass concentrations were concurrently measured at both sites during summer and winter. The summer concentrations (mean ± S.D. [median]), 0.13 ± 0.06 [0.12] ng/m(3) at the MERI site and 0.08 ± 0.05 [0.07] ng/m(3) at the William site, were all significantly higher than the winter concentrations, 0.02 ± 0.01 [0.02] ng/m(3) and 0.03 ± 0.01 [0.03] ng/m(3) at the MERI and William sites, respectively. The site difference (i.e., MERI > William) was observed for summer Cr(VI) concentrations; however, no differenc...Continue Reading

References

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Jun 30, 2015·Aerosol and Air Quality Research·Lihui HuangZhihua Tina Fan

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