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INTERACTIONS OF ACIDIC HERBICIDES BENTAZON AND DICAMBA WITH ORGANOCLAYS
Author(s) -
Carrizosa María José,
Koskinen William C.,
Carmen Hermosín María
Publication year - 2004
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj2004.1863
Subject(s) - sorption , organoclay , chemistry , sorbent , bentazon , fourier transform infrared spectroscopy , montmorillonite , adsorption , environmental chemistry , nuclear chemistry , organic chemistry , chemical engineering , weed , agronomy , biology , engineering
We determined the sorption mechanism of the acidic herbicides bentazon [3‐(1‐methylethyl)‐1 H ‐2,1,3‐benzothiadiazin‐4(3 H )‐one 2,2‐dioxide] and dicamba (3,6‐dichloro‐2‐methoxybenzoic acid) on two organoclays, octadecylammonium (ODA)‐ and hexadecyltrimethylammonium (HDTMA)‐exchanged Arizona montmorillonite (SAz‐1), as part of a study to determine their potential use as sorbent materials for ionizable organic pollutants. To determine the mechanisms involved in the sorption process, herbicide‐organoclay complexes were characterized by x‐ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). In general, the d 001 values of SAz‐HDTMA and SAz‐ODA organoclays expanded after herbicide saturation, indicating interlayer sorption of the herbicide. Also, FTIR spectroscopic studies suggested weak hydrophobic interactions between these herbicides and the interlayer organic phase of the organoclays. However, H bonding between these herbicides and the monosubstituted amino group in SAz‐ODA reinforced the strength of the hydrophobic interactions resulting in nonreadily reversible sorption on that organoclay. These results suggest that organoclays can be used to remove this type of pollutants from water or soils.