SSSAJ Grow Your Career with SSSA
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Published in Soil Sci Soc Am J 45:465-468 (1981)
© 1981 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Sposito, G.
Right arrow Articles by LeVesque-Madore, C. S.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Sposito, G.
Right arrow Articles by LeVesque-Madore, C. S.
GeoRef
Right arrow GeoRef Citation
Agricola
Right arrow Articles by Sposito, G.
Right arrow Articles by LeVesque-Madore, C. S.

Trace Metal Complexation by Fulvic Acid Extracted from Sewage Sludge: I. Determination of Stability Constants and Linear Correlation Analysis1

Garrison Sposito, K. M. Holtzclaw and C. S. LeVesque-Madore2

ABSTRACT

The complexes formed between either Cd2+ or Pb2+ and fulvic acid extracted from sewage sludge mixtures were investigated by potentiometric titration of K/H fulvate with either Cd(ClO4)2 or Pb(ClO4)2 at pH 5.0 and 25°C, in an ionic medium of 0.1M KClO4. Formation functions were calculated from the titration data and analyzed by the Scatchard plot method. The results were similar to those obtained previously for sludge-fulvic acid complexes of Ca2+ and Cu2+, in that two classes of complexes were found for both Cd2+ and Pb2+. The common logarithms of the measured conditional stability constants for the two types of complexes with sludge-derived fulvic acid were hypothesized to be linearly correlated with the Misono softness parameter, which is a quantitative measure of the tendency to covalent bonding on the part of a metal cation. The resulting linear correlation equations had r2-values ≥ 0.99 and, therefore, were used to predict conditional stability constants for complexes of sludge-derived fulvic acid with Mg2+, Mn2+, Fe2+, Ni2+, and Zn2+, which cannot be investigated by the method of potentiometric titration.

NOTES

1 Contribution from the Dep. of Soil and Environmental Sciences, Univ. of California, Riverside, CA 92521.

2 Professor of Soil Science, Research Associate IV, and Research Associate II, respectively.

Received for publication January 17, 1980. Accepted for publication January 7, 1981.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
The SCI Journals Agronomy Journal Crop Science
Vadose Zone Journal Journal of Plant Registrations
Journal of Natural Resources
and Life Sciences Education		 Journal of
Environmental Quality
Copyright © 1981 by the Soil Science Society of America.