‘Single-laboratory’ validation of a method of quantitative analysis of alachlor, chlorpyriphos-methyl, fenthion, and trifluralin

Abstract

A simple, new gas-chromatography method was developed and validated by a single-laboratory for quantitative determination of four active ingredients (alachlor, chlorpyriphos-methyl, fenthion, and trifluralin) in their commercially available emulsifiable concentrate formulations, widely used in Greece. This method enables the analysis of a number of pesticides with the same chromatographic conditions and internal standard. A capillary gas-chromatographic system equipped with a flame ionization detector and a split injector was used. The linearity of response, specificity, repeatability and other performance characteristics of the method are presented. As a result, the method is validated.

Keywords:

• ‘Multi-pesticide’ method
• Gas chromatographic analysis
• Fenthion
• Alachlor
• Chlorpyriphos-methyl
• Trifluralin

Acknowledgements

This study has been supported by the International Atomic Energy Agency (IAEA), Co-ordinated Research Project ‘Quality Control of pesticides’ (Contract No. 11772/RO). The authors thank Bayer, Dow AgroSciences, and Monsanto, for their kind donation of analytical standards, blank formulations, and the batches for each active ingredient.