Uncertainty evaluation for the determination of sulfamethizole residues in organic fertilizers by liquid chromatography-tandem mass spectrometry method
The sulfamethizole residues in organic fertilizers were determined according to"Determination of 19 veterinary medicines in organic fertilizer-Liquid chromatography-tandem mass spectrometry method"(GB/T 40462-2021),and the uncertainty was evaluated.The sources of uncertainty included the components of standard solution preparation,sample preparation,measurement repeatability,recovery and instrument.The calculation results of relative standard uncertainty indicated that the main factors affecting the uncertainty were the fitting of the standard curve,the purity of the standard and the preparation process of the standard curve,which should be focused and controlled during the actual experiment.It was found that at the 95％confidence level,the final result in the fertilizer sample was expressed as X(SMT)=(189.82±20.12)mg/kg when the expansion factor(k)was taken as 2.
liquid chromatography-tandem mass spectrometryorganic fertilizerssulfamethizoleuncertainty evaluation
万方数据
维普
