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- Title
Roadside Rhododendron pulchrum leaves as bioindicators of heavy metal pollution in traffic areas of Okayama, Japan.
- Authors
Suzuki, Kazuyuki; Yabuki, Toru; Ono, Yoshiro
- Abstract
The leaves of roadside Rhododendron pulchrum Sweet were examined as a bioindicator of traffic-related heavy metal pollution in Okayama. Total contents of heavy metals in roadside soil and the R. pulchrum leaves were determined. Results of correlation analyses showed significant correlations among Pb, Ni, and Zn contents of roadside soil and leaf samples. These results suggest that R. pulchrum is a useful bioindicator of heavy metal pollution in traffic areas. To identify traffic-related heavy metal pollution sources, traffic-related materials such as tires, asphalt pavement, and road paint were collected and analyzed. The results of analyses of our data show that Zn is emitted mainly from the abrasion of tires; Cr is emitted mainly from wear of the asphalt pavement. Furthermore, the respective lead isotope ratios in R. pulchrum leaves, soil, roadside dust, and traffic-related materials were measured using inductively coupled plasma mass spectrometry. The isotopic compositions of lead in R. pulchrum leaves were 207Pb/206Pb = 0.861–0.871 and 208Pb/206Pb = 2.093–2.127, which agrees well with ratios in automobile wheel balance weights, suggesting that lead-containing products associated with automobiles, such as wheel balance weights, contribute to traffic-related lead pollution.
- Subjects
JAPAN; RHODODENDRON varieties; METALS &; the environment; HEAVY metals &; the environment; TIRES &; the environment; LEAD &; the environment; INDUCTIVELY coupled plasma mass spectrometry; CUMULATIVE effects assessment (Environmental assessment); HEAVY metal toxicology
- Publication
Environmental Monitoring & Assessment, 2009, Vol 149, Issue 1-4, p133
- ISSN
0167-6369
- Publication type
Article
- DOI
10.1007/s10661-008-0188-7