Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Influence of temporal variations in river discharge, pH, alkalinity and Caon the speciation and concentration of heavy metals in some mining polluted rivers
Autore:
Gundersen, P; Steinnes, E;
Indirizzi:
Norwegian Univ Sci & Technol, Dept Chem, N-7491 Trondheim, Norway Norwegian Univ Sci & Technol Trondheim Norway N-7491 1 Trondheim, Norway
Titolo Testata:
AQUATIC GEOCHEMISTRY
fascicolo: 3, volume: 7, anno: 2001,
pagine: 173 - 193
SICI:
1380-6165(200109)7:3<173:IOTVIR>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRACE-ELEMENTS; PHYSICOCHEMICAL SPECIATION; ALUMINUM CHEMISTRY; SIZE FRACTIONATION; MISSISSIPPI RIVER; NATURAL-WATERS; DIEL VARIATION; MINE DRAINAGE; STREAM; TOXICITY;
Keywords:
dialysis in situ; Cu; Zn; Cd; Al; speciation; pH; alkalinity; discharge; variations; river; aquatic;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
54
Recensione:
Indirizzi per estratti:
Indirizzo: Gundersen, P Norwegian Univ Sci & Technol, Dept Chem, N-7491 Trondheim, Norway Norwegian Univ Sci & Technol Trondheim Norway N-7491 Norway
Citazione:
P. Gundersen e E. Steinnes, "Influence of temporal variations in river discharge, pH, alkalinity and Caon the speciation and concentration of heavy metals in some mining polluted rivers", AQUAT GEOCH, 7(3), 2001, pp. 173-193

Abstract

Dissolved (dialysis in situ) and total concentrations of Cu, Zn, Cd and Alin eight mining polluted rivers in the Roros area, central Norway, were determined by atomic absorption spectrometry (flame and graphite furnace) andcompared to pH, Ca concentration and alkalinity through seasonal variations in river discharge. Total concentrations of the metals were highest during early spring flood and during summer and autumn rain episodes. Dissolved concentrations also increased as the spring flood proceeded, but small discharge peaks within this similar to2 month period as well as a considerable autumn flood episode appeared to lower rather than to raise the dissolved metal concentrations. Consequently the dissolved fractions of Zn, Cd and Al showed a significant negative correlation with river discharge, and were low at the discharge peaks. Possibly high sediment concentrations occurring at high flood conditions more than counteracted desorption induced by pH decrease, and led to decreased dissolved fractions through adsorption. Cu speciation on the other hand seemed to be more closely linked to pH. Alkalinityand Ca concentration, both assumed to protect aquatic life from metal pollution, were significantly lower during episodes with high Cu and Al total concentrations.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/07/20 alle ore 23:51:37