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Titolo:
TEMPORALLY VARIABLE FRESH-WATER SOURCES OF DISSOLVED CHROMIUM TO THE SAN-FRANCISCO BAY ESTUARY
Autore:
ABUSABA KE; FLEGAL AR;
Indirizzi:
UNIV CALIF SANTA CRUZ,DEPT CHEM SANTA CRUZ CA 95064
Titolo Testata:
Environmental science & technology
fascicolo: 12, volume: 31, anno: 1997,
pagine: 3455 - 3460
SICI:
0013-936X(1997)31:12<3455:TVFSOD>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
RIVER INFLOW; CALIFORNIA; SEDIMENTS; OXIDATION; KINETICS; DYNAMICS; WATERS; DELTA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
38
Recensione:
Indirizzi per estratti:
Citazione:
K.E. Abusaba e A.R. Flegal, "TEMPORALLY VARIABLE FRESH-WATER SOURCES OF DISSOLVED CHROMIUM TO THE SAN-FRANCISCO BAY ESTUARY", Environmental science & technology, 31(12), 1997, pp. 3455-3460

Abstract

Chromium is a common contaminant in estuarine environments, originating from chemical manufacturing, steel refining, and leather tanning. However, it is also relatively abundant in the earth's crust, resultingin substantial natural sources from upland watersheds. The objective of this study is to quantify the relative magnitudes of natural and anthropogenic chromium fluxes to San Francisco Bay, an important estuaryin the National Estuaries Program. Chromium speciation was determinedthroughout the estuary during the wet and dry seasons of 1992-1995. Those measurements, hydrographs of freshwater endmembers, and silicate-salinity plots reveal the complexity of chromium sources to the highlymodified estuary. Episodic flushing of an agricultural drain transports chromium leached from alluvial sediments to the northern reach of the estuary. In contrast, the principal dissolved chromium source to the southern reach appears to be diagenic remobilization from sediments within the estuary. In both the northern and southern reaches, dissolved chromium fluxes are scavenged back onto particles, showing that sediments serve as both a source and a sink in the geochemical cycle of chromium. Direct anthropogenic chromium inputs are dwarfed by high-flowfluvial inputs but are comparable to low-flow dissolved inputs.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 04:35:06