Study of metal fractionation in river sediments. A comparison between kinetic and sequential extraction procedures.
The extraction kinetic of trace metals (Cd, Cu, Pb, and Zn) in river sediments by four extraction agents was studied. As extractants ammonium acetate, acetic acid, hydroxylamine and EDTA solutions were assayed. These reagents can leach the metals more or less selectively from several metal compartments of sediments. The metal leaching kinetic model permits classification of the metal species in labile and moderately-labile ones. The combination of two or more non specific reagents permits a high characterisation of metal distribution and leachability. The results obtained with this model in four river sediments were compared with data obtained by the SM&T sequential extraction procedure, in order to characterise the chemical nature of leached metal.
Department of Agriculture Chemistry, Geology and Geochemistry, Autónoma University of Madrid, Campus de Cantoblanco, E-28049 Madrid, Spain.
M Jesús
MJ
Gismera
Javier
J
Lacal
Pilar
P
da Silva
Rosario
R
García
M
M
Teresa Sevilla
Jesús R
JR
Procopio
D004784:Environmental Monitoring / Q000379:methods; D005618:Fresh Water / Q000737:chemistry*; D019015:Geologic Sediments / Q000737:chemistry; D008670:Metals / Q000737:chemistry / Q000302:isolation & purification*; D019216:Metals, Heavy / Q000737:chemistry / Q000302:isolation & purification; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
D008670:Metals; D019216:Metals, Heavy; D014874:Water Pollutants, Chemical