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 Weber, J. B. Articles by Upchurch, R. P. Search for Related Content PubMed Articles by Weber, J. B. Articles by Upchurch, R. P. Agricola Articles by Weber, J. B. Articles by Upchurch, R. P.

The Influence of Temperature and Time on the Adsorption of Paraquat, Diquat, 2,4-D and Prometone by Clays, Charcoal, and an Anion-Exchange Resin¹

ABSTRACT

The effects of temperature and exposure time on the adsorption of four organic compounds by montmorillonite, kaolinite, charcoal, and an anion-exchange resin in a phosphate buffer of pH 6.0 were investigated. Organic cations (diquat and paraquat) were preferentially adsorbed by the clays up to the cationexchange capacity. Adsorption appeared to be one of ion exchange. X-ray analysis indicated the cations were held in the lattice of the montmorillonite with the plane of the ring parallel to the silicate sheets. An organic anion (2,4-D) was negatively adsorbed by the clays; and a s-triazine compound (prometone) in molecular form, was adsorbed by montmorillonite but not kaolinite. X-ray analysis indicated that prometone was located within the clay lattice but the orientation was uncertain. The adsorption mechanism was physical in nature being temperature dependent.

The 2,4-D was adsorbed by the anion-exchange resin through ion exchange forces and the equilibrium was influenced by temperature and exposure time. Prometone was adsorbed by the anion-exchange resin to a much lesser degree, was also temperature and time dependent, and appeared to be physically bound.

All of the organic compounds were adsorbed by charcoal and each was influenced differently by temperature and exposure time.

¹ Contribution from the Crop Science Department, North Carolina Agr. Exp. Sta., Raleigh. Published with the approval of the Director of Research as Paper No. 1949 of the Journal Series. This investigation was supported by CRF-1 regional research. Statistical computations in this project were supported by NIA Grant No. FR 00011 held by the Institute of Statistics.

² Assistant Professor of Crop Science, Instructor of Crop Science and Professor of Crop Science, respectively.

Received for publication April 12, 1965. Accepted for publication July 27, 1965.