DEVELOPING A METHOD TO DETERMINE 2,4-D AND MCPA IN TEA WITH DERIVATIZATION BY GAS CHROMATOGRAPHY -ELECTRON CAPTURE DETECTOR (GC-ECD)

Show simple item record

dc.contributor.author CHAMARA, P.G.T.
dc.date.accessioned 2021-04-01T07:56:24Z
dc.date.available 2021-04-01T07:56:24Z
dc.date.issued 2010
dc.identifier.other UWU/EAG/06/0008
dc.identifier.uri http://www.erepo.lib.uwu.ac.lk/bitstream/handle/123456789/6360/UWULD%20EAG%2006%200008-14052019100257.pdf?sequence=1&isAllowed=y
dc.description.abstract A gas chromatographic method with electron capture detector was developed for the residue determination of two phenoxy acid herbicide residues (4-Chloro-2-methylphenoxy acetic acid and 2,4-dichlorophenoxy acetic acid) in black tea. The black tea samples were extracted with methanol: water (8:2) mixture, and then followed by liquid-liquid partition with dichloromethane and water. Then the residues were derived with methanol: sulfuric acid (9:1) mixture and the resulting mixture was further cleaned up by hexane and washed with NaHCO3. The esters were analyzed by a gas chromatograph equipped with an electron capture detector (ECD) and they were quantified by the external standard method. The average recovery percentages of the spiked samples at 0.05, 0.1, 1.0 ppm were 0.09225, 0.05775 and 0.05325 consecutively. Since the recoveries of the spiked samples at 3 spike levels were all below 70%, it was revealed that the method is not capable to comply with different acceptability criteria of food regulatory organizations for 2,4-D and MCPA maximum residue in black tea for European Union and Japanese market. The proposed method can be applied with some modifications of methylating reagent, extraction method and clean-up method to determine pesticide residue in black tea. en_US
dc.language.iso en en_US
dc.publisher Uva Wellassa University of Sri Lanka en_US
dc.relation.ispartofseries ;UWU/EAG/06/0008
dc.subject Export Agriculture Degree Programme (EAG) en_US
dc.title DEVELOPING A METHOD TO DETERMINE 2,4-D AND MCPA IN TEA WITH DERIVATIZATION BY GAS CHROMATOGRAPHY -ELECTRON CAPTURE DETECTOR (GC-ECD) en_US
dc.title.alternative Research Article – EAG 2010 en_US
dc.type Thesis en_US


Files in this item

This item appears in the following Collection(s)

Show simple item record

Search UWU eRepository


Browse

My Account