Adsorption and desorption of Zn, Cu, and Cr by sediments from the Raisin River (Michigan)

Journal Article · Thu Jan 01 00:00:00 EST 1987 · J. Great Lakes Res.; (United States)

DOI:https://doi.org/10.1016/S0380-1330(87)71657-8· OSTI ID:6805882

Young, T C; DePinto, J V; Kipp, T W

Metal absorption by Raisin River sediments in vitro depended linearly on soluble metal concentration to adsorption densities of 6000-9000 ..mu..g/g with 48 hr partition coefficients of approximately 50, 30, and 25 L/g for Cu, Cr, and Zn, respectively. Partition coefficient computed from field data spanned a comparatively wider range of values in a manner consistent with the often reported adsorbent concentration effect, but other factors likely contributed, too. Desorption of Zn was complete and rapid in contrast to Cr, which was incomplete and much slower; Cu desorption was intermediate to Zn and Cr. A reversible-resistant equilibrium model could not describe the observations as Cu and Cr had not reached metastable desorption equilibria after 24 days. Metal desorption, however, could be described kinetically by distributing sorbed cations between either of two classes; rapidly desorbing and slowly desorbing cations. Sequential and simultaneous desorption models gave similar predictions. Aqueous chemical considerations suggested precipitated as well as adsorbed species could give rise to the observations, but available data did not permit adequate tests of this hypothesis. The extent to which kinetic constraints rather than irreversible reactions account for the desorption-resistant binding signifies a potentially greater metal mobility of bioavailability than would otherwise be assumed. 27 references, 5 figures, 4 tables.

• Research Organization: Clarkson Univ., Potsdam, NY (USA)
• OSTI ID: 6805882
• Journal Information: J. Great Lakes Res.; (United States), Vol. 13:3
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
CHROMIUM
ECOLOGICAL CONCENTRATION
COPPER
MICHIGAN
WATER POLLUTION
RIVERS
CONTAMINATION
SEDIMENTS
ZINC
ADSORPTION
COMPARATIVE EVALUATIONS
DESORPTION
EXPERIMENTAL DATA
DATA
ELEMENTS
FEDERAL REGION V
INFORMATION
METALS
NORTH AMERICA
NUMERICAL DATA
POLLUTION
SORPTION
STREAMS
SURFACE WATERS
TRANSITION ELEMENTS
USA
520200* - Environment
Aquatic- Chemicals Monitoring & Transport- (-1989)