title: Mobility Studies of (14)C-Chlorpyrifos in Malaysian Oil Palm Soils.
abstract: The mobility of (14)C-chlorpyrifos using soil TLC was investigated in this study. It was found that chlorpyrifos was not mobile in clay, clay loam and peat soil. The mobility of (14)C-chlorpyrifos and non-labelled chlorpyrifos was also tested with silica gel TLC using three types of developing solvent hexane (100%), hexane:ethyl acetate (95:5, v/v); and hexane:ethyl acetate (98:2, v/v). The study showed that both the (14)C-labelled and non-labelled chlorpyrifos have the same Retardation Factor (Rf) for different developing solvent systems. From the soil column study on mobility of chlorpyrifos, it was observed that no chlorpyrifos residue was found below 5 cm depth in three types of soil at simulation rainfall of 20, 50 and 100 mm. Therefore, the soil column and TLC studies have shown similar findings in the mobility of chlorpyrifos.
authors.affiliation: Analytical and Quality Development Unit, Product Development and Advisory Services Division, Malaysian Palm Oil Board, No. 6, Persiaran Institusi, Bandar Baru Bangi, 43000, Kajang, Selangor, Malaysia. halimah@mpob.gov.my.
authors.forename: Muhamad
authors.initials: M
authors.lastname: Halimah
authors.affiliation: School of Environmental and Natural Resource Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia.
authors.forename: B Sahid
authors.initials: BS
authors.lastname: Ismail
authors.affiliation: Faculty of Agriculture, Biotechnology and Food Sciences, Universiti Sultan Zainal Abidin, Tembila Campus, 22200, Besut, Terengganu, Malaysia.
authors.forename: Mat
authors.initials: M
authors.lastname: Nashriyah
authors.affiliation: Analytical and Quality Development Unit, Product Development and Advisory Services Division, Malaysian Palm Oil Board, No. 6, Persiaran Institusi, Bandar Baru Bangi, 43000, Kajang, Selangor, Malaysia.
authors.forename: Zainol
authors.initials: Z
authors.lastname: Maznah
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D028023:Arecaceae; D004390:Chlorpyrifos / Q000032:analysis* / Q000737:chemistry; D002855:Chromatography, Thin Layer; D000077215:Clay; D007306:Insecticides / Q000032:analysis* / Q000737:chemistry; D008296:Malaysia; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis* / Q000737:chemistry; D012997:Solvents
chemical_list: D000538:Aluminum Silicates; D007306:Insecticides; D012987:Soil; D012989:Soil Pollutants; D012997:Solvents; D004390:Chlorpyrifos; D000077215:Clay
keywords: 14C; Chlorpyrifos; Mobility; Soil; TLC