Abstract:

This study aimed to obtain tea matrix reference material containing acetamiprid residues to be used for
quality system control of analytical chemistry laboratory, Acetamiprid solutions were sprayed on organic tea at a dosage
of 0.05 mg/kg. After being dried in the shade, milled and mixed, tea matrix sample containing acetamiprid residues
was obtained. The homogeneity was tested by random sampling method and the stability was examined by linear
model method. The certification was finally carried out by multiple laboratories. The results showed that the contents
of acetamiprid were not significantly different in these samples and no significant degradation was observed within 180
days at -10 ℃. The certification results showed that the standard value of acetamiprid content of tea reference material
was 0.0417 mg/kg and the expanded uncertainty (95% confidence interval) was 0.004 25 mg/kg.

Key words: tea, acetamiprid residues, matrix reference material, preparation, property value