In order to evaluate the technical capability of laboratory determination of benzoic acid,this capability verification is organized and implemented.This proficiency test used fruit wine as a quality control sample,which passed stability and uniformity tests before distribution.The results were evaluated using the Z-ratio score method.A total of 228 laboratories participated in this proficiency testing activity,with 220 laboratories achieving satisfactory results,accounting for 96.5%;4 laboratories with suspicious results,accounting for 1.75%;there are 4 laboratories with unsatisfactory results,accounting for 1.75%.At the same time,provide technical analysis and laboratory improvement suggestions based on the results of this validation.
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