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Titolo:
POREWATER GRADIENTS AND DIFFUSIVE BENTHIC FLUXES OF CO, NI, CU, ZN, AND CD IN SAN-FRANCISCO BAY
Autore:
RIVERADUARTE I; FLEGAL AR;
Indirizzi:
UNIV CALIF SANTA CRUZ,WIGS,EARTH & MARINE SCI BLDG SANTA CRUZ CA 95064
Titolo Testata:
Croatica chemica acta
fascicolo: 1, volume: 70, anno: 1997,
pagine: 389 - 417
SICI:
0011-1643(1997)70:1<389:PGADBF>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
SEDIMENT-WATER INTERFACE; PORE-WATER; INTERSTITIAL WATERS; NARRAGANSETT BAY; MARINE-SEDIMENTS; ORGANIC-MATTER; METALS; COPPER; CALIFORNIA; CADMIUM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
52
Recensione:
Indirizzi per estratti:
Citazione:
I. Riveraduarte e A.R. Flegal, "POREWATER GRADIENTS AND DIFFUSIVE BENTHIC FLUXES OF CO, NI, CU, ZN, AND CD IN SAN-FRANCISCO BAY", Croatica chemica acta, 70(1), 1997, pp. 389-417

Abstract

In order to determine the remobilization of Co, Ni, Cu, Zn, and Cd from the sediments, gradients of their dissolved (< 0.45 mu m) and particulate concentrations were measured in both relatively pristine and contaminated sediments of San Francisco Bay, as well as relatively pristine adjacent embayments (Tomales Bay and Drakes Estero). Three mechanisms were determined to regulate the diagenetic release of those elements to porewaters: (i) the degradation of organic matter in oxic and suboxic zones; (ii) the reduction of Mn in suboxic zones; and (iii) the formation of soluble metal-sulfide complexes in anoxic zones. While the estimated diffusive benthic fluxes of Ni, Cu, and Cd were relativelysmall (less than or equal to 10%) compared to their riverine fluxes, the estimated diffusive benthic fluxes of Co and Zn were similar (approximate to 100%) to their riverine inputs. These initial estimates also indicate that the total (dissolved and particulate) benthic remobilization of Co, Ni, Cu, and Zn is greater than either riverine or point source inputs of those elements to San Francisco Bay. Moreover, those benthic inputs are projected to become more significant as the anthropogenic inputs of those elements, from both point sources and non-pointsources, are reduced.

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Documento generato il 27/10/20 alle ore 10:06:48