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 HighWire Citing Articles via Google Scholar Google Scholar Articles by Clay, S. A. Articles by Wyse, D. L. Search for Related Content PubMed Articles by Clay, S. A. Articles by Wyse, D. L. Agricola Articles by Clay, S. A. Articles by Wyse, D. L.

Desorption of Atrazine and Cyanazine from Soil

USDA-Agricultural Research Service, 439 Borlaug Hall, 1991 Upper Buford Circle, St. Paul, MN 55108;
Dep. of Agronomy and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55108.

^* Corresponding author.

ABSTRACT

Removal of soluble soil organic carbon (SSOC) during herbicide desorption studies using the batch equilibration method may affect the herbicide-soil-solution equilibrium particularly if herbicide-SSOC complexes can form. Desorption characteristics of atrazine (2-chloro-4-ethylamino-6-isopropylamino-s-triazine) and cyanazine (2-{[4-chloro-6-(ethylamino)-s-triazine-2-yl]amino}-2-methylpropionitrile] were determined in a Ves clay loam (Aquic Hapludolls). For adsorption, the soil was equilibrated with 0.01 M CaCl₂ solutions containing atrazine or cyanazine. Desorption with 0.01 M CaCl₂ each day for 5 d resulted in hysteresis when compared to the adsorption isotherm. Replacement of the equilibration solution with soil extract for 5 d, while maintaining a higher SSOC content in the desorption equilibration solution than did the CaCl₂ solution, did not change desorption isotherm equations. The SSOC-herbicide complexes were not detected in any of the adsorption and desorption equilibration solutions by ultrafiltration (membranes with molecular mass cut offs of 10 000 and 500 daltons), HPLC, or TLC techniques. Either s-triazine-SSOC complexes were not formed in sufficient quantities or they were not stable enough to affect desorption of the herbicide during batch equilibration.

Contribution of the Soil and Water Manage. Res. Unit, USDA-ARS, St. Paul, MN, and the Minnesota Agric. Exp. Stn. Journal Ser. Paper no. 15 557.

Received for publication August 18, 1987.

This article has been cited by other articles:

				M. C. Smith, D. R. Shaw, J. H. Massey, M. Boyette, and W. Kingery Using Nonequilibrium Thin-Disc and Batch Equilibrium Techniques to Evaluate Herbicide Sorption J. Environ. Qual., July 1, 2003; 32(4): 1393 - 1404. [Abstract] [Full Text] [PDF]

				J.-H. Park, Y. Feng, P. Ji, T. C. Voice, and S. A. Boyd Assessment of Bioavailability of Soil-Sorbed Atrazine Appl. Envir. Microbiol., June 1, 2003; 69(6): 3288 - 3298. [Abstract] [Full Text] [PDF]

				Y. Seol and L. S. Lee Coupled Effects of Treated Effluent Irrigation and Wetting-Drying Cycles on Transport of Triazines through Unsaturated Soil Columns J. Environ. Qual., September 1, 2001; 30(5): 1644 - 1652. [Abstract] [Full Text] [PDF]

				R. Celis and W. C. Koskinen Characterization of Pesticide Desorption from Soil by the Isotopic Exchange Technique Soil Sci. Soc. Am. J., November 1, 1999; 63(6): 1659 - 1666. [Abstract] [Full Text] [PDF]