Journal of Environmental Biology

Adsorption, desorption and mobility of cyfluthrin in three Malaysian tropical soils of different textures

B.S. Ismail¹*, Lee Yin Choo¹, S. Salmijah¹, M. Halimah² and M.A. Tayeb¹

¹School of Environmental and Natural Resource Sciences, Faculty of Science and Technology, University Kebangsaan Malaysia,

43600 UKM Bangi, Selangor, Malaysia

²Malaysian Palm Oil Board, 50720 Kuala Lumpur, Malaysia

*Corresponding Author E-mail: ismail@ukm.edu.my

Publication Data

Paper received:

30 September 2013

Revised received:

14 January 2015

Accepted:

23 March 2015

Abstract

The sorption and desorption of cyfluthrin mixture isomers were determined using batch equilibration method and mobility was studied under laboratory conditions, using packed soil column. The soil types used in the study were clayey, clay loam and sandy clay loam obtained from three tomato farms in Cameron Highlands. A low Freundlich adsorption distribution coefficient K_ads(f) for cyfluthrin was observed for clayey, clay loam and sandy clay loam soils (95.69, 21.64 and 8.99 l/kg, respectively). Results showed that cyfluthrin had high Freundlich organic matter (OM) distribution coefficient K_oc values of 5799, 2278 and 1635 lkg^-1 for clayey, clay loam and sandy clay loam soils, respectively. These values indicate that cyfluthrin is considered immobile in Malaysian soils with different textures, based on the value of K_oc by McCall. Adsorption of cyfluthrin was significantly (P< 0.05) affected with soil pH, fertilizer NPK, organic matter content and temperature. It was observed that approximately 95.8%, 93.8% and 91.8% of the adsorbed cyfluthrin remained sorbed after four successive rinses for clayey, clay loam and sandy clay loam soils. Soil column test showed that cyfluthrin was not detected in leachate. Cyfluthrin was detected in topsoil and its concentration decreased with depth. The downward movement of cyfluthrin in sandy clay loam soil was more than that in clay loam and clayey soils. Approximately, 80.9%, 77.8% and 67.3% cyfluthrin was observed at the depth of 0-5 cm (rainfall 350 mm) for clayey, clay loam and sandy clay loam soils respectively. Mobility of cyfluthrin showed that the percentage of cyfluthrin leached into soil was not affected by the amount of rainfall. The result clearly showed that cyfluthrin molecules were bound strongly to all the three Malaysian soil types.    

 Key words

Cyfluthrin mobility, Freundlich equation, Leaching, Packed soil column, Solid phase extraction

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