Adsorption, desorption, and mobility of two insecticides in Malaysian agricultural soil

Ismail Sahid, A. O S Enoma, U. B. Cheah, K. Y. Lum, Zulkifli Malik

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Laboratory studies utilizing radioisotopic techniques were conducted to determine the adsorption, desorption, and mobility of endosulfan (6,7,8,9,10,10-hexachloro-1,5,5a,6,9,9a-hexahydro-6, 9-methano-2,4,3-benzodioxanthiepin3-oxide) and methamidophos (O,S-dimethyl phosphorothioate) in sandy loam and clay soils of the Cameron Highlands and the Muda rice-growing area, respectively. High Freundlich adsorption distribution coefficients [Kads(f)] for endosulfan (6.74 and 18.75) and low values for methamidophos (0.40 and 0.98) were obtained in the sandy loam and clay soils, respectively. The observed Koc values for endosulfan were 350.85 (sandy loam) and 1143.19 (clay) while Koc values of 20.92 (sandy loam) and 59.63 (clay) were obtained for methamidophos. Log Kow of 0.40 and 1.25 were calculated for endosulfan as well as - 1.96 and - 1.21 for methamidophos in the sandy loam and clay soils, respectively. Desorption was common to both pesticides but the desorption capacity of methamidophos from each soil type far exceeded that of endosulfan. Soil thin layer chromatography (TLC) and column my studies showed that while methamidophos was very mobile in both soils, endosulfan displayed zero mobility in clay soil.

Original languageEnglish
Pages (from-to)355-364
Number of pages10
JournalJournal of Environmental Science and Health - Part B Pesticides, Food Contaminants, and Agricultural Wastes
Volume37
Issue number4
DOIs
Publication statusPublished - 2002

Fingerprint

methamidophos
Insecticides
Endosulfan
endosulfan
agricultural soils
agricultural soil
desorption
Adsorption
insecticide
Desorption
sandy loam
adsorption
insecticides
Soil
sandy clay soils
Clay
Soils
clay soil
sandy clay
sandy loam soils

Keywords

  • Adsorption
  • Desorption
  • Endosulfan
  • Methamidophos
  • Mobility

ASJC Scopus subject areas

  • Environmental Science(all)
  • Environmental Chemistry
  • Public Health, Environmental and Occupational Health
  • Waste Management and Disposal

Cite this

Adsorption, desorption, and mobility of two insecticides in Malaysian agricultural soil. / Sahid, Ismail; Enoma, A. O S; Cheah, U. B.; Lum, K. Y.; Malik, Zulkifli.

In: Journal of Environmental Science and Health - Part B Pesticides, Food Contaminants, and Agricultural Wastes, Vol. 37, No. 4, 2002, p. 355-364.

Research output: Contribution to journalArticle

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