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Purity Testing of Different Groups of Insecticides

M. W. Akon
Scientific Officer
Entomology Division, BARI, Gazipur

M. S. Ahmed
Senior Scientific Officer
Entomology Division, BARI, Gazipur

M. D. H. Prodhan
Scientific Officer
Entomology Division, BARI, Gazipur

M. A. Rahman
Senior Scientific Officer
Entomology Division, BARI, Gazipur

Abstract/ Executive Summary:

The study was conducted to determine the purity of available marketed brands of nine selected chemical groups of insecticide collected from local markets of three different locations. Emamectin Benzoate and Imidacloprid were included for the first time this year and all the tested brands of first one were found pure, while for the other groups, one of the four tested brands was impure containing 78% of required a.i. All of the tested brands of Quinalphos, Cypermethrin and Malathion were found more than 99% pure in terms of ai presence. Like previous years, a brand of Diazinon was found containing no a.i. and the other tested brand was also impure and contained 41.9% of required a.i. Only one brand of Fenitrothion was tested which contained only 73.3% of required a.i. In case of Fenvalerate and Chlorpyriphos 50% of tested brands were impure containing <80% a.i.

Keywords: Purity test, insecticides, HPLC

Location: Gazipur

Start Date: 10-09-2010

End Date: 15-05-2011

Program Area: Pest Management

Commodity: Insecticide

Objectives:

To determine the purity of available marketed brands of nine selected chemical groups of insecticide collected from local markets of three different locations.

Methodology:

Tested Insecticides groups: Emamectin Benzoate Imidacloprid Fenvalerate Quinalphos Malathion Fenitrothion Cypermethrin Chlorpyriphos Diazinon. Several brands of insecticide groups were collected from dealers of Jessore, Comilla and Norsingdi, where extensive usage of pesticides was recorded. The brands were selected on the basis of their demand among the farmers. Each formulated product either of granular or liquid was being dissolved in the respective solvent. The solvents were selected on the basis of the criteria described by Lehotay and Mastovska, 2004. The solutions of different brands of marketed pesticides were prepared in the toxicology extraction laboratory following the procedure compatible with the respective equipment. In case of granular pesticides, the solid inert materials were removed by filtration. In case of liquid pesticide, the known concentration of the solutions was prepared directly. For the solid or liquid pesticides with color substances, the color was removed by passing it through florisil column chromatography. Thus, known and similar concentrated solutions of each of the standard and formulated pesticides were prepared. Methods for testing different brands with GC-FID, GC-ECD and HPLC were developed by setting the instrument parameters suitable for analyzing concerned group of pesticide selected on the basis of peak sharpness of the chromatogram and retention time for respective compound.

Source of Information: Annual Report 2010-2011, Entomology Division, BARI , Gazipur

Article Link (Online Journal):

Funding Source:

1.	Budget: 2,0000.00

Total Budget (Tk.) : 2,0000.00

Achievement/Findings:

All of the tested brands of Quinalphos, Cypermethrin and Malathion were found more than 99% pure in terms of ai presence. Like previous years, a brand of Diazinon was found containing no a.i. and the other tested brand was also impure and contained 41.9% of required a.i. Only one brand of Fenitrothion was tested which contained only 73.3% of required a.i. In case of Fenvalerate and Chlorpyriphos 50% of tested brands were impure containing <80% a.i.

Knowledge Management: Report/Proceedings