EVALUATION OF CONDITIONAL STABILITY-CONSTANTS OF DISSOLVED ALUMINUM HUMIC SUBSTANCE COMPLEXES BY MEANS OF AL-27 NUCLEAR-MAGNETIC-RESONANCE

Authors
LAMBERT J BUDDRUS J BURBA P
Citation
J. Lambert et al., EVALUATION OF CONDITIONAL STABILITY-CONSTANTS OF DISSOLVED ALUMINUM HUMIC SUBSTANCE COMPLEXES BY MEANS OF AL-27 NUCLEAR-MAGNETIC-RESONANCE, Fresenius' journal of analytical chemistry, 351(1), 1995, pp. 83-87
Citations number
18
Categorie Soggetti
Chemistry Analytical
Journal title
Fresenius' journal of analytical chemistry → ACNP
ISSN journal
09370633
Volume
351
Issue
1
Year of publication
1995
Pages
83 - 87
Database
ISI
SICI code
0937-0633(1995)351:1<83:EOCSOD>2.0.ZU;2-I
Abstract
An analytical procedure for evaluating the conditional stability const ants K' of aluminum/humic substance complexes, based on Al-27 nuclear magnetic resonance spectroscopy, is described. It is well suited for t he determination of Al(III) dissociated from dissolved humic substance s at slightly acidic pH values. The new procedure offers a good sensit ivity and requires neither special preparation of the sample nor the e valuation of complex coupled chemical equilibria. The pK' values range from 2.0 to 4.3 depending on the ratio [Al-complex] to dissolved orga nic carbon and the pH.