Development of a certified reference material of thiamethoxam in acetonitrile
A certified reference material of thiamethoxam in acetonitrile was developed and approved as a primary certified reference material(GBW08772).It was prepared by gravimetric-volumetric method with value assigned thiamethoxam material(purity 99.4％)and chromatographic grade acetonitrile as solvent.Research has found that thiamethoxam could undergo a guanidyl degradation in water and methanol to produce thiamethoxam-urea,therefore acetonitrile was selected as the solvent.According to JJF 1343-2022,the solvent stability,homogeneity,short-term stability,and long-term stability tests were carried out for the prepared solution using high-performance liquid chromatography.Finally,the mass concentration of the developed reference material GBW08772 was 1.00 mg/mL with a relative expanded uncertainty of 1％(k=2).The developed solution certified reference material of thiamethoxam has traceability and accuracy,and meets the requirements of national food safety determination.
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