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Fluridone Adsorption on Mineral Clays, Organic Matter, and Modified Norfolk Soil

Published online by Cambridge University Press:  12 June 2017

Patrick J. Shea  and
Jerome B. Weber
Patrick J. Shea
Affiliation:
Agron. Dep., Univ. of Nebraska, Lincoln, NE 68583, Crop Sci. Dep., North Carolina State Univ. Raleigh, NC 27607
Jerome B. Weber
Affiliation:
Agron. Dep., Univ. of Nebraska, Lincoln, NE 68583, Crop Sci. Dep., North Carolina State Univ. Raleigh, NC 27607
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Abstract

Adsorption and desorption characteristics of fluridone (1-methyl-3-phenyl-5-[3-txifluoromethyl)phenyl]-4-(1H)-pyridinone} on prepared clays and organic matter were studied in unbuffered and buffered aqueous solutions. In unbuffered aqueous solution the adsorption of fluridone decreased in the order: H-saturated organic matter (H-OM) > Ca-saturated montmorillonite (Ca-mont) > Ca-saturated organic matter (Ca-OM) > kaolinite. Based on the chemistry of fluridone, the nature of the adsorbent, and previously reported studies, the major adsorption mechanisms appear to be pH-dependent adsorption of protonated fluridone and direct protonation of the herbicide at acidic surfaces, supplemented by physical adsorption forces such as van der Waals attractions and charge transfer bonds. The adsorption of fluridone on Norfolk sand (Typic Paleudult; fine-loamy, siliceous, thermic), unmodified (CK), or amended with montmorillonite (HC) or organic matter (HM) at pH 4.0, 5.2, and 7.0 was also studied. Over all adsorption was greatest on HC soil, least on CK soil, and intermediate on the HM soil. In each system adsorption was inversely related to pH. These results were interpreted by comparison with adsorption observed on prepared clay minerals and organic matter.

Keywords

MontmorillonitekaolinitepH effectsbuffer effects
Type
Research Article
Information
Weed Science , Volume 31 , Issue 4 , July 1983 , pp. 528 - 532
Copyright
Copyright © 1983 Weed Science Society of America 

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References

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