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Titolo:
Past leaded gasoline emissions as a nonpoint source tracer in riparian systems: A study of river inputs to San Francisco Bay
Autore:
Dunlap, CE; Bouse, R; Flegal, AR;
Indirizzi:
Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA Univ Calif Santa Cruz Santa Cruz CA USA 95064 z, Santa Cruz, CA 95064 USA US Geol Survey, Menlo Park, CA 94025 USA US Geol Survey Menlo Park CA USA94025 l Survey, Menlo Park, CA 94025 USA
Titolo Testata:
ENVIRONMENTAL SCIENCE & TECHNOLOGY
fascicolo: 7, volume: 34, anno: 2000,
pagine: 1211 - 1215
SICI:
0013-936X(20000401)34:7<1211:PLGEAA>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
CONTAMINATION; SEA; CALIFORNIA; SEDIMENTS; CADMIUM; METALS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Engineering, Computing & Technology
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Dunlap, CE Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA Univ Calif Santa Cruz Santa Cruz CA USA 95064 uz, CA 95064 USA
Citazione:
C.E. Dunlap et al., "Past leaded gasoline emissions as a nonpoint source tracer in riparian systems: A study of river inputs to San Francisco Bay", ENV SCI TEC, 34(7), 2000, pp. 1211-1215

Abstract

Variations in the isotopic composition of lead in 1995-1998 river waters flowing into San Francisco Bay trace the washout of lead deposited in the drainage basin from leaded gasoline combustion. At the confluence of the Sacramento and San Joaquin rivers where they enter the Bay, the isotopic compositions of lead in the waters define a linear trend away from the measured historical compositions of leaded gas in California. The river waters are shifted away from leaded gasoline values and toward an isotopic composition similar to Sierra Nevadan inputs which became the predominant source of sedimentation in San Francisco Bay following the onset of hydraulic gold miningin 1853. Using lead isotopic compositions of hydraulic mine sediments and average leaded gasoline as mixing end members, we calculate that more than 50% of the lead in the present river water originated from leaded gasoline combustion. The strong adsorption of lead (log K-d > 7.4) to particulates appears to limit the flushing of gasoline lead from the drainage basin, and the removal of that lead from the system may have reached an asymptotic limit. Consequently, gasoline lead isotopes should prove to be a useful nonpoint source tracer of the environmental distribution of particle-reactive anthropogenic metals in freshwater systems.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/09/20 alle ore 19:32:16