Sorption and Detoxification of Toxic Compounds by a Bifunctional Organoclay
Ludmila Groismana,
Chaim Rav-Achaa,
Zev Gerstlb,* and
Uri Mingelgrinb
a Research Laboratory of Water Quality, Ministry of Health, P.O. Box 8255, Tel-Aviv 61080, Israel
b Institute of Soil, Water and Environmental Sciences, The Volcani Center, ARO, P.O. Box 6, Bet Dagan, 50250, Israel

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Fig. 1. Structure of the organic cation N-decyl-N,N-dimethyl-N-(2-aminoethyl) ammonium (DDMAEA).
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Fig. 2. The structure of the pesticides studied.
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Fig. 3. Sorption isotherms for methyl parathion and tetrachlorvinphos on the bifunctional (DDMAEA) and nonbifunctional (DTMA) organoclays.
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Fig. 4. The rate of methyl parathion hydrolysis in the presence of the long-chain bifunctional (DDMAEA) organoclay and in five controls (pH 9.0).
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Fig. 5. pH rate profile for the hydrolysis of methyl parathion [kbifunctional kDTMA (d1)].
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Fig. 6. The hydrolysis of tetrachlorvinphos (A) and methyl parathion (B) in the presence of the long-chain bifunctional (DDMAEA) organoclay and controls (pH 10.0).
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Copyright © 2004 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.