Journal ArticleDOI
Contamination of roadside soil and vegetation with cadmium, nickel, lead, and zinc
John V. Lagerwerff,A. W. Specht +1 more
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TLDR
In this article, it was shown that high CONCENTRATIONS of one METAL in the soil do not NECESSARILY degrade with distance from the road with other METALS.Abstract:
MOTOR VEHICLES CONTAMINATE ROADSIDE SOILS AND VEGETATION WITH FOUR HEAVY METAL ATMOSPHERIC POLLUTANTS. THE CONTAMINATION HAS BEEN CORRELATED WITH COMPOSITION OF GASOLINE, MOTOR OIL, AND CAR TIRES. THESE CONCENTRATIONS DECREASE WITH DISTANCE FROM TRAFFIC AND WITH DEPTH IN SOIL PROFILE. IN SPITE OF THE DEPENDENCE OF ROADSIDE CADMIUM, NICKEL, LEAD, AND ZINC ON TRAFFIC, IT APPEARS THAT HIGH CONCENTRATIONS OF ONE METAL IN THE SOIL DO NOT NECESSARILY ENTAIL HIGH CONCENTRATIONS OF ANOTHER ONE OF THE METALS. /AUTHOR/read more
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Journal ArticleDOI
Roads and their major ecological effects
TL;DR: Road density and network structure are informative landscape ecology assays and Australia has huge road-reserve networks of native vegetation, whereas the Dutch have tunnels and overpasses perforating road barriers to enhance ecological flows.
Journal ArticleDOI
Bed sediment-associated trace metals in an urban stream, Oahu, Hawaii
TL;DR: A detailed study was conducted to examine total metal contents in bed sediments from a 5.8-km stretch of Manoa Stream as mentioned in this paper, where a total of 123 samples were examined for 18 elements and 14 samples for 21 elements.
Journal ArticleDOI
Chemical fractionation of cadmium, copper, nickel, and zinc in contaminated soils
Lena Q. Ma,Gade N. Rao +1 more
TL;DR: In this paper, the authors used sequential extraction to fractionate four heavy metals (Cd, Cu, Ni, and Zn) from nine contaminated soils into six operationally defined groups: water soluble, exchangeable, carbonate, Fe-Mn oxide, organic, and residual.
Journal ArticleDOI
Near-Roadway Air Quality: Synthesizing the Findings from Real-World Data
TL;DR: Two types of normalization, background and edge-of-road, were applied to the observed concentrations, and differences between the normalization methods arose due to the likely bias inherent in background normalization.
Journal ArticleDOI
Factors influencing metal bioavailability in soils: preliminary investigations for the development of a critical loads approach for metals
TL;DR: The concept of critical loads, previously applied to acidifying substances, is currently being extended, within the Convention on Long Range Transboundary Air Pollution (CLRTAP), to several metals: Cd, Cu, Hg, Pb and Zn as discussed by the authors.