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 40:254-258 (1976)
© 1976 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 Similar articles in ISI Web of Science
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 ISI Web of Science (54)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Holtzclaw, K. M.
Right arrow Articles by Bradford, G. R.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Holtzclaw, K. M.
Right arrow Articles by Bradford, G. R.
Agricola
Right arrow Articles by Holtzclaw, K. M.
Right arrow Articles by Bradford, G. R.

Analytical Properties of the Soluble, Metal-Complexing Fractions in Sludge-Soil Mixtures: I. Extraction and Purification of Fulvic Acid1

Kenneth M. Holtzclaw, Garrison Sposito and Gordon R. Bradford2

ABSTRACT

A laboratory method is described for extracting and purifying the fulvic acid fraction of sludge-soil mixtures. The method, which does not include dialysis or the use of destructive chemical reagents, consists of: (i) extraction with 0.5N NaOH and acidification to pH 1.0 with HCl, (ii) repeated high-speed centrifugation to remove Al-Fe-hydroxy phosphates, and (iii) use of both chelating and H-form cation exchange resins to remove complexed metal impurities. The existing procedures for preparing fulvic acid, based upon research on natural soil organic matter, were concluded to be not fully adequate for studies on sludge-soil mixtures. Primarily, this inadequacy is the result of the loss, through dialysis, of important reactive fractions during purification and the lack of specific steps that treat the greater variety of trace elements to be found in sludge materials. In addition, the presence of significant amounts of P in these mixtures complicates the removal of colloidal and complexed metal impurities. The application of the present method to representative sludge-soil mixtures showed that ash contents are reduced to I-2%. The procedure should be generally applicable in soil or sediment organic matter studies as well as to studies on the chemistry of sludge-amended soil.

NOTES

1 Contribution from the Dep. of Soil Science and Agric. Eng., Univ. of California, Riverside, CA 92502.

2 Staff Research Associate, Assistant Professor of Soil Science, and Specialist, respectively.

Received for publication August 27, 1975. Accepted for publication December 23, 1975.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1976 by the Soil Science Society of America.