Establishment of National Quality Control System for Analytical Laboratory of Pesticide Products by Proficiency Testing

Abstract Performance of proficiency testing and the validation of analytical method was included ascheme of quality assurance in analytical chemistry laboratory to monitor a laboratory’s performance abilitiesand produce consistently reliable data. This study was assessed the applicability of proficiency testing schemeproposed for analytical laboratories of pesticide product in domestic. The validation of analytical methods,stability and homogeneity for formulated pesticide products (emulsifiable concentrate) of emamectin benzoateand lufenuron was confirmed for the proficiency testing. The z-score of 33 participation laboratories foremamectin benzoate were that the numbers of outlier were 2 laboratories (6.0%), z-score outside the rangefrom −3 to 3 designated “unaccptable” were 2 laboratories and z-score in the ranges −2 to −3 and 2 to 3designated “questionable” were 3 laboratories (9.0%). Three laboratories (9.0%) showed the z-scoredesignated “questionable” for lufenuron. The additional proficiency testing for various product types will beneeded to establish the scheme of quality control.Key words Homogenity, Pesticide formulation, Proficiency test, Stability