Sorption of the ionizable pesticide imazamox by organo-clays and organohydrotalcites

被引:65
作者
Celis, R
Koskinen, WC
Cecchi, AM
Bresnahan, GA
Carrisoza, MJ
Ulibarri, M
Pavlovic, I
Hermosín, MC
机构
[1] CSIC, Inst Recursos Nat & Agrobiol Sevilla, E-41080 Seville, Spain
[2] USDA ARS, Soil & Water Manag Res Unit, St Paul, MN 55108 USA
[3] Univ Minnesota, Dept Soil Water & Climate, St Paul, MN 55108 USA
[4] N Dakota State Univ, Dept Plant Sci, Fargo, ND 58103 USA
[5] Univ Cordoba, Dept Quim Inorgan & Ingn Quim, Cordoba, Spain
关键词
desorption; imazamox; organoclays; organohydrotalcites; sorption;
D O I
10.1080/03601239909373237
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The ability of two montmorillonites, SWy-2 and SAz-1, one hydrotalcite, HT [(Mg3Al(OH)(8))(2). CO3. 4H(2)O], and some of their organoderivatives (organoclays and organohydrotalcites) to sorb the ionizable pesticide imazamox (2-[4,5-dihydro-4-methyl-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-(methoxymethyl)-3-pyridinecarboxylic acid) was determined at different pH levels to determine their potential use as sorbent materials for ionizable organic pollutants. At the pH of the sorbents (pH 6-7), the anionic form of imazamox predominated and the calcined product of HT (HT500) was found to be the best sorbent for imazamox anion. Negligible sorption of imazamox anion was measured on the pure clays, on hydrotalcite and organohydrotalcites, whereas sorption on organoclays was moderate and highly irreversible. Decreasing the pH led to a great increase in the sorption capacity of the organoclays, due to formation of molecular imazamox, which had a great affinity for the interlayer organic phase of the organoclays. In contrast, extensive dissolution of the hydroxide structure of the hydrotalcites at low pH limited their use as sorbent material in acidic conditions.
引用
收藏
页码:929 / 941
页数:13
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