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Purity Testing of Five Different Groups of Insecticides from Four Different Regions of Bangladesh

M. W. Akon
Entomology Division, BARI, Gazipur

M.S. Ahmed
Entomology Division, BARI, Gazipur

M.A. Rahman
Entomology Division, BARI, Gazipur

Afroza Begum
Entomology Division, BARI, Gazipur

Abstract/ Executive Summary:

The study was undertaken to determine the purity of available marketed brands of seven selected insecticide groups collected from local markets of seven different locations. The total number insecticide brands of seven different groups was 45 and 84.44% of the tested brands were found more than 90% pure in terms of Al (Active Ingredient) presence. The purity range of about 2.22% of the total tested brands was 80%-90% and the remaining 13.33% were less than 80% pure, of which two brands contained no Al at all.

Keywords: Purity testing,Insecticides, Determine

Location:

Start Date:

End Date:

Program Area: Pest Management

Commodity: Insecticide

Objectives:

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

Methodology:

Several brands of the tested insecticide groups (viz. Fenvalerate, Quinalphos,Malathion, carbofuran, Dimethoate, Cypermethrin, Chloropyriphos) were collected from dealers of Rajshahi, Rangpur, Bogra, Lalmonirhat, Mymensing, Jamalpur, Ishurdi and Jessore 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 pesticide analytical 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 were 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 Research report, Entomology Division, BARI, Gazipur, 2013-2014

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The analysis results revealed that three of the seven tested brands of Dimethoate contained about half of the required AI (48.7%-53.1 %). Three brands were found pure as those contained more than 98% of the required AI, while the other one was 87% pure. Fenvalerate: Four brands of Fenvalerate were tested with HPLC. Analysis results for Fenvalerate showed that three of our tested brands were more than 95 % pure in term of AI presence, and the remaining one contained no AI at all. Quinalphos: Six marketed brands of Quinalphos were tested with GC (FID).

Knowledge Management: Report/Proceedings