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Titolo:
BEHAVIOR OF URANIUM DURING MIXING IN THE DELAWARE AND CHESAPEAKE ESTUARIES
Autore:
SARIN MM; CHURCH TM;
Indirizzi:
PHYS RES LAB AHMEDABAD 380009 GUJARAT INDIA UNIV DELAWARE,COLL MARINE STUDIES NEWARK DE 19716
Titolo Testata:
Estuarine, coastal and shelf science
fascicolo: 6, volume: 39, anno: 1994,
pagine: 619 - 631
SICI:
0272-7714(1994)39:6<619:BOUDMI>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
ISOTOPES; THORIUM; WATERS; BENGAL; BAY;
Keywords:
URANIUM; MIXING; ESTUARIES; DELAWARE BAY; CHESAPEAKE BAY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
M.M. Sarin e T.M. Church, "BEHAVIOR OF URANIUM DURING MIXING IN THE DELAWARE AND CHESAPEAKE ESTUARIES", Estuarine, coastal and shelf science, 39(6), 1994, pp. 619-631

Abstract

Unequivocal evidence is presented for the removal of uranium in two major estuarine systems of the north-eastern United States: the Delaware and Chesapeake Bays. In both the estuaries, during all seasons but mostly in summer, dissolved uranium shows distinctly non-conservative behaviour at salinities less than or equal to 5. At salinities above 5,there are no deviations from the ideal dilution line. In these two estuaries as much as 22% of dissolved uranium is removed at low salinities, around salinity 2. This pronounced removal of uranium observed at low salinities has been investigated in terms of other chemical properties measured in the Delaware Estuary. In the zone of uranium removal,dissolved oxygen is significantly depleted and pH goes through a minimum down to 6.8. In the same low salinity regime, total alkalinity shows negative deviation from the linear dilution line and phosphate is removed. Humic acids, dissolved iron and manganese are also rapidly removed during estuarine mixing in this low salinity region. Thus, it appears that removal of uranium is most likely related to those properties of alkalinity and acid-base system of the upper estuary that may destabilize the uranium-carbonate complex. Under these conditions, uranium may associate strongly with phosphates or humic substances and be removed onto particulate phases and deposited within upper estuarine sediments.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 18:22:51