HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Ahumada, I. A. Articles by Mattigod, S. V. Search for Related Content PubMed Articles by Ahumada, I. A. Articles by Mattigod, S. V. Agricola Articles by Ahumada, I. A. Articles by Mattigod, S. V.

Extraction by Barium Salts of Heavy Metals from Two Chilean Soils¹

ABSTRACT

Extraction of Cd, Cu, Ni, and Zn by BaCl₂ and Ba(ClO₄)₂ solutions from El Recuerdo (Vertisol) and Puerto Octay (Andept) soils was used to measure the amounts of metals remaining extractable during a 60-d storage period under air-dry and wet conditions. The El Recuerdo soil with an original pH of 7.3 sorbed about twice the amounts of metals sorbed by the Puerto Octay soil with an original pH of 5.5. The percent of the sorbed metal that remained extractable was in the order of Cd > Ni > Zn > Cu for El Recuerdo but Ni > Cd > Zn > Cu for the Puerto Octay soils. The decrease in pH associated with metal sorption was greatest for Cu which also showed the maximum fixation against extraction with Ba. The amounts of metals remaining extractable generally decreased with time, indicating that fixation reactions were essentially complete in 15 d in most cases and continued beyond the 15-d period in a few cases. The BaCl₂ solution desorbed more Cd than Ba(ClO₄)₂, but this effect of anion was not shown for the other metals, which agrees with the fact that the stability constants for soluble Cl complexes for Cd are greater than for the other metals. Only small and inconsistent differences were found for storage in air-dry as compared to wet conditions.

¹ Contribution from the Dep. of Inorganic and Analytical Chemistry of the Univ. of Chile, Casilla 233, Santiago, Chile; and from the Dep. of Soil and Environmental Sciences, Univ. of California, Riverside, CA 92521. Financial support of the U.S. NSF and Chilean CONICYT and Fondo Nacional de Investigacion Cientifica is gratefully acknowledged.

² Instructor and Professor, respectively, Univ. of Chile; and Professor and Assistant Professor, Univ. of California.

Received for publication September 23, 1983. Accepted for publication June 8, 1984.