DETERMINATION OF TRICHLORFON AND DICHLORVOS RESIDUES IN SHRIMP USING GAS-CHROMATOGRAPHY WITH NITROGEN-PHOSPHORUS DETECTION

Citation
Ma. Ngoh et R. Cullison, DETERMINATION OF TRICHLORFON AND DICHLORVOS RESIDUES IN SHRIMP USING GAS-CHROMATOGRAPHY WITH NITROGEN-PHOSPHORUS DETECTION, Journal of agricultural and food chemistry, 44(9), 1996, pp. 2686-2689
Citations number
21
Categorie Soggetti
Food Science & Tenology",Agriculture,"Chemistry Applied
ISSN journal
00218561
Volume
44
Issue
9
Year of publication
1996
Pages
2686 - 2689
Database
ISI
SICI code
0021-8561(1996)44:9<2686:DOTADR>2.0.ZU;2-Q
Abstract
A method capable of quantifying trichlorfon and dichlorvos in shrimp a t concentrations of 20-80 ng/g has been developed. Ground shrimp is ho mogenized in ethyl acetate and centrifuged. The supernatant is dried c ompletely on a rotatory evaporator. The extract is dissolved in petrol eum ether, concentrated on a solid phase extraction column, and analyz ed by gas chromatography using a cool on-column inlet and a nitrogen-p hosphorus detector. The analytes are separated from matrix components using a thermal gradient on a (cyanopropyl)phenyl-methylpolysiloxane c olumn. The method was validated with control shrimp fortified at 20, 4 0, and 80 ng/g trichlorfon and dichlorvos. The average recoveries and intralaboratory coefficients of variations were 50-83% and 15-21% resp ectively.