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Titolo:
CHROMIUM IN SAN-FRANCISCO BAY - SUPERPOSITION OF GEOCHEMICAL PROCESSES CAUSES COMPLEX SPATIAL DISTRIBUTIONS OF REDOX SPECIES
Autore:
ABUSABA KE; FLEGAL AR;
Indirizzi:
UNIV CALIF SANTA CRUZ,DEPT CHEM & BIOCHEM SANTA CRUZ CA 95064 UNIV CALIF SANTA CRUZ,WIGS SANTA CRUZ CA 95064
Titolo Testata:
Marine chemistry
fascicolo: 2-3, volume: 49, anno: 1995,
pagine: 189 - 199
SICI:
0304-4203(1995)49:2-3<189:CISB-S>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
RIVER WATER; SEA-WATER; ESTUARY; OXIDATION; KINETICS; SEAWATER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
K.E. Abusaba e A.R. Flegal, "CHROMIUM IN SAN-FRANCISCO BAY - SUPERPOSITION OF GEOCHEMICAL PROCESSES CAUSES COMPLEX SPATIAL DISTRIBUTIONS OF REDOX SPECIES", Marine chemistry, 49(2-3), 1995, pp. 189-199

Abstract

Processes controlling the geochemical cycle of Cr in San Francisco Bay were characterized with analyses of water samples taken from 25 stations distributed throughout the estuary. Mixing of water masses, localized inputs, in-situ reduction, and sediment resuspension contributed to complex spatial distributions of dissolved (< 0.45 mu m) Cr(III) and Cr(VI), as well as suspended particulate Cr. Total dissolved Cr concentrations in the bay ranged from 1.9 to 8.3 nM, with the maximum concentration observed at the head of the estuary (the Delta) that was attributed to a relatively large input (5.2 nM) of Cr(III) within the SanJoaquin River. The calculated Cr(III) scavenging residence time in that region was relatively long (> 3 days) for a particle reactive tracemetal, suggesting either localized inputs or complexation by colloidal/organic matter. There was also a relative excess (2.6 nM) of Cr(VI) in another section of the Delta. Mass balance calculations showed thatexcess was the same order of magnitude as reported point source loadings of Cr in that area. The subsequent depletion of Cr(VI), along witha concurrent increase in Cr(III) concentration in a shallow region ofthe Delta, was tentatively attributed to in-situ reduction.

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Documento generato il 26/09/20 alle ore 13:57:57