Labile complexes of trace metals in aquatic humic substances: Investigations by means of an ion exchange-based flow procedure

1994 ◽  
Vol 349 (12) ◽  
pp. 800-807 ◽  
Author(s):  
P. Burba ◽  
J. Rocha ◽  
D. Klockow
Keyword(s):  
Trace Metals ◽  
Ion Exchange ◽  
Humic Substances ◽  
Aquatic Humic Substances

scholarly journals Lability of Cd, Cr, Cu, Mn and Pb complexed by aquatic humic substances

2005 ◽  
Vol 30 (2) ◽  
pp. 45-51 ◽  
Author(s):  
G. R. Castro ◽  
C. C. F. Padilha ◽  
J. C. Rocha ◽  
J. P. S. Valente ◽  
A. de O. Florentino ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Metal Ions ◽  
Humic Substances ◽  
Water Samples ◽  
Metal Ion ◽  
Distribution Coefficients ◽  
Metal Exchange ◽  
Aquatic Humic Substances ◽  
Ph Values ◽  
Complexation Time

The lability of Cd(II), Cr(III), Cu(II), Mn(II) and Pb(II) complexed by humic substances (HSs) was investigated by means of ion exchange on cellulose modified with p-aminobenzoic groups (Cell-PAB), using a batch procedure. The HSs were extracted from water samples using adsorption in a column packed with XAD 8 resin. The metal-HS complexes were prepared by adding solutions containing all the aforementioned metal ions ( Cd(II), Cr(III), Cu(II), Mn(II) and Pb(II) ). The results indicated that the distribution coefficients (Kd) of Cell-PAB decreased with the presence of HSs, and that the lability of metal fractions complexed by HSs decreases in pH values > 4.0, complexation time > 10 h and HS concentration > 500 mg L-1. The metal exchange between HSs and Cell-PAB exhibited the following order of metal ion lability: Cd < Pb < Mn <FONT FACE=Symbol>@</FONT> Cr < Cu.

Preparative isolation of aquatic humic substances

1981 ◽  
Vol 15 (4) ◽  
pp. 463-466 ◽  
Author(s):  
Earl M. Thurman ◽  
Ronald L. Malcolm
Keyword(s):  
Humic Substances ◽  
Aquatic Humic Substances ◽  
Preparative Isolation

Complexation of copper by aquatic humic substances from different environments

1983 ◽  
Vol 28 (1-3) ◽  
pp. 65-76 ◽  
Author(s):  
Diane M. McKnight ◽  
Gerald L. Feder ◽  
E. Michael Thurman ◽  
Robert L. Wershaw ◽  
John C. Westall
Keyword(s):  
Humic Substances ◽  
Aquatic Humic Substances
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