Triadimefon Interactions with Organoclays and Organohydrotalcites

We determined the ability of several organoclays (octadecylammonium‐ and hexadecyltrimethylammonium‐exchanged montmorillonite) and organohydrotalcites (dodecylsulfate‐ and dodecylbenzenesulfonate‐exchanged hydrotalcite) to sorb the uncharged pesticide triadimefon [1‐(4‐chlorophenoxy)‐3,3‐dimethyl‐1‐...

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Bibliographic Details
Published in:	Soil Science Society of America journal Vol. 64; no. 1; pp. 36 - 43
Main Authors:	Celis, R., Koskinen, W.C., Hermosı´n, M.C., Ulibarri, M.A., Cornejo, J.
Format:	Journal Article
Language:	English
Published:	Madison, WI Soil Science Society of America 01-01-2000 American Society of Agronomy
Subjects:	Agronomy. Soil science and plant productions Applied sciences Biological and medical sciences Decontamination Decontamination. Miscellaneous Earth sciences Earth, ocean, space Engineering and environment geology. Geothermics Exact sciences and technology Fundamental and applied biological sciences. Psychology Geology Montmorillonite Pesticides Pollution Pollution, environment geology Soil and sediments pollution Soil and water pollution Soil science Soils Sorbents organoclays Organic cation TRIADIMEFON Slow release form Soil pollution Property formulation relationship Anion exchange Decontamination Inorganic material Soil interaction Ion exchange Modified material Clay Montmorillonite Pesticides Desorption Phyllosilicate Experimental study organohydrotalcites Fungicide Lauryl sulfate Quaternary ammonium compound Sorption Organic anion Hydrotalcite Water pollution control Ammonium compound Triazole derivatives Environment Properties of materials Water pollution Sorbent Physicochemical properties
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Summary:	We determined the ability of several organoclays (octadecylammonium‐ and hexadecyltrimethylammonium‐exchanged montmorillonite) and organohydrotalcites (dodecylsulfate‐ and dodecylbenzenesulfonate‐exchanged hydrotalcite) to sorb the uncharged pesticide triadimefon [1‐(4‐chlorophenoxy)‐3,3‐dimethyl‐1‐(1H‐1,2,4‐triazol‐1‐yl)‐2‐butanone] to test the potential use of these sorbents for decontamination purposes and as slow release formulations of the pesticide. Interlayered organoclays and organohydrotalcites were at least six times more sorptive than the untreated minerals. Triadimefon sorption was higher on paraffin‐like sorbents (organohydrotalcites and organoclays prepared from high‐charge Arizona montmorillonite) than on bilayered sorbents (organoclays prepared from low‐charge Wyoming montmorillonite). The nature and amount of organic ion in the interlayer also influenced triadimefon desorption from the different sorbents. Desorption and spectroscopic studies suggested, in general, weak hydrophobic interactions between triadimefon and the interlayer organic phase of the organoclays and organohydrotalcites. However, hydrogen bonding between the carbonyl group of triadimefon and the monosubstituted amino group of octadecylammonium‐exchanged organoclays reinforced the strength of the interaction and resulted in reduced desorption from these sorbents. Selecting the interlayer ion appeared, therefore, as a good strategy to control the sorptivity and desorption of the sorbed pesticide for organoclays and organohydrotalcites. The results showed that organoclays and organohydrotalcites may find application as sorbents of pesticides similar to triadimefon.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0361-5995 1435-0661
DOI:	10.2136/sssaj2000.64136x