Determination of organophosphorus pesticides by dispersive liquid-liquid microextraction coupled with gas chromatography-electron capture detection.

A simple, rapid and sensitive method termed as dispersive liquid–liquid microextraction (DLLME) combined with gas chromatography-electron capture detector (GC-ECD) was developed for the determination of selected organophosphorus pesticides (OPPs) namely chlorpyrifos, dimethoate and diazinon in wat...

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Main Authors:	Sanagi, Mohd Marsin, Mokhtar, Siti Umairah, Wan Ibrahim, Wan Aini, Miskam, Mazidatulakmam
Format:	Article
Language:	English
Published:	Malaysian Society of Analytical Sciences (ANALIS), UKM 2011
Subjects:	QD Chemistry
Online Access:	http://irep.iium.edu.my/43220/ http://irep.iium.edu.my/43220/ http://irep.iium.edu.my/43220/1/marsin-2.pdf

id	iium-43220
recordtype	eprints
spelling	iium-432202015-06-09T06:40:00Z http://irep.iium.edu.my/43220/ Determination of organophosphorus pesticides by dispersive liquid-liquid microextraction coupled with gas chromatography-electron capture detection. Sanagi, Mohd Marsin Mokhtar, Siti Umairah Wan Ibrahim, Wan Aini Miskam, Mazidatulakmam QD Chemistry A simple, rapid and sensitive method termed as dispersive liquid–liquid microextraction (DLLME) combined with gas chromatography-electron capture detector (GC-ECD) was developed for the determination of selected organophosphorus pesticides (OPPs) namely chlorpyrifos, dimethoate and diazinon in water sample. In this method, a mixture of carbon disulfide, CS2 (extraction solvent) and methanol (disperser solvent) was rapidly injected using syringe into the 5.00 mL water sample to form a cloudy solution where the OPPs were extracted into the fine droplets of extraction solvent. Upon centrifugation for 3 min at 3500 rpm, the fine droplets were sedimented at the bottom of the centrifuge tube. Sedimented phase (1μL) was injected into the GC-ECD for separation and determination of OPPs. Important extraction parameters, such as type of disperser solvent, volume of extraction solvent and volume of disperser solvent were investigated. The optimized conditions for DLLME of the selected OPPs were methanol as disperser solvent, 30 μL of extraction solvent (CS2 ) and 1.0 mL of disperser solvent (methanol). Under the optimum extraction conditions, the method showed good linearity in the range of 0.1 to 1.0 μg/mL with correlation coefficient (r 2 ), in the range of 0.9976 to 0.9994 and low limits of detection (LOD) between 0.047 and 0.201 μg/mL. The proposed method provided acceptable recoveries (72.67- 144%) with good RSDs ranging from 2.74% to 7.48%. This method was successfully applied to the determination of OPPs in water samples obtained from a golf course and chlorpyrifos and diazinon were detected at concentration 0.18 μg/mL and 0.07 μg/mL, respectively. Malaysian Society of Analytical Sciences (ANALIS), UKM 2011 Article PeerReviewed application/pdf en http://irep.iium.edu.my/43220/1/marsin-2.pdf Sanagi, Mohd Marsin and Mokhtar, Siti Umairah and Wan Ibrahim, Wan Aini and Miskam, Mazidatulakmam (2011) Determination of organophosphorus pesticides by dispersive liquid-liquid microextraction coupled with gas chromatography-electron capture detection. The Malaysian Journal of Analytical Sciences, 15 (2). pp. 232-239. ISSN 1394-2506 http://www.ukm.my/mjas/
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	QD Chemistry
spellingShingle	QD Chemistry Sanagi, Mohd Marsin Mokhtar, Siti Umairah Wan Ibrahim, Wan Aini Miskam, Mazidatulakmam Determination of organophosphorus pesticides by dispersive liquid-liquid microextraction coupled with gas chromatography-electron capture detection.
description	A simple, rapid and sensitive method termed as dispersive liquid–liquid microextraction (DLLME) combined with gas chromatography-electron capture detector (GC-ECD) was developed for the determination of selected organophosphorus pesticides (OPPs) namely chlorpyrifos, dimethoate and diazinon in water sample. In this method, a mixture of carbon disulfide, CS2 (extraction solvent) and methanol (disperser solvent) was rapidly injected using syringe into the 5.00 mL water sample to form a cloudy solution where the OPPs were extracted into the fine droplets of extraction solvent. Upon centrifugation for 3 min at 3500 rpm, the fine droplets were sedimented at the bottom of the centrifuge tube. Sedimented phase (1μL) was injected into the GC-ECD for separation and determination of OPPs. Important extraction parameters, such as type of disperser solvent, volume of extraction solvent and volume of disperser solvent were investigated. The optimized conditions for DLLME of the selected OPPs were methanol as disperser solvent, 30 μL of extraction solvent (CS2 ) and 1.0 mL of disperser solvent (methanol). Under the optimum extraction conditions, the method showed good linearity in the range of 0.1 to 1.0 μg/mL with correlation coefficient (r 2 ), in the range of 0.9976 to 0.9994 and low limits of detection (LOD) between 0.047 and 0.201 μg/mL. The proposed method provided acceptable recoveries (72.67- 144%) with good RSDs ranging from 2.74% to 7.48%. This method was successfully applied to the determination of OPPs in water samples obtained from a golf course and chlorpyrifos and diazinon were detected at concentration 0.18 μg/mL and 0.07 μg/mL, respectively.
format	Article
author	Sanagi, Mohd Marsin Mokhtar, Siti Umairah Wan Ibrahim, Wan Aini Miskam, Mazidatulakmam
author_facet	Sanagi, Mohd Marsin Mokhtar, Siti Umairah Wan Ibrahim, Wan Aini Miskam, Mazidatulakmam
author_sort	Sanagi, Mohd Marsin
title	Determination of organophosphorus pesticides by dispersive liquid-liquid microextraction coupled with gas chromatography-electron capture detection.
title_short	Determination of organophosphorus pesticides by dispersive liquid-liquid microextraction coupled with gas chromatography-electron capture detection.
title_full	Determination of organophosphorus pesticides by dispersive liquid-liquid microextraction coupled with gas chromatography-electron capture detection.
title_fullStr	Determination of organophosphorus pesticides by dispersive liquid-liquid microextraction coupled with gas chromatography-electron capture detection.
title_full_unstemmed	Determination of organophosphorus pesticides by dispersive liquid-liquid microextraction coupled with gas chromatography-electron capture detection.
title_sort	determination of organophosphorus pesticides by dispersive liquid-liquid microextraction coupled with gas chromatography-electron capture detection.
publisher	Malaysian Society of Analytical Sciences (ANALIS), UKM
publishDate	2011
url	http://irep.iium.edu.my/43220/ http://irep.iium.edu.my/43220/ http://irep.iium.edu.my/43220/1/marsin-2.pdf
first_indexed	2023-09-18T21:01:36Z
last_indexed	2023-09-18T21:01:36Z
_version_	1777410660120920064

Determination of organophosphorus pesticides by dispersive liquid-liquid microextraction coupled with gas chromatography-electron capture detection.

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