绿茶中联苯菊酯和氯氟氰菊酯残留检测质量控制基体标准物质的研制

Preparation of matrix reference materials of bifenthrin and cyhalothrin pesticide residues in green tea

目的:制备一批绿茶中联苯菊酯和氯氟氰菊酯基体标准物质。方法:以绿茶为研究对象,通过喷洒联苯菊酯和氯氟氰菊酯,样品经粉碎、过筛、均质、装瓶,通过均匀性、稳定性检验后,由3家实验室联合定值确定量值,并进行不确定度评估。结果:绿茶中联苯菊酯和氯氟氰菊酯的量值分别为(0.185±0.0197),(0.207±0.0466)mg/kg,k=2,置信区间为95%。结论:研制出的绿茶中联苯菊酯和氯氟氰菊酯基体标准物质足够均匀,足够稳定,定值结果可靠。

Objective:The preparation method of matrix reference materials of bifenthrin and cyhalothrin pesticide residues in green tea was established.Methods:Green tea samples were sprayed with biphenylthrin and cyhalothrin.The samples were crushed,screened,homogenized and bottled.After the homogeneity and stability tests,the quantity value was determined by three laboratories,and the uncertainty was evaluated.Results:The amount values of bifenthrin and cyhalothrin in green tea were(0.185±0.0197)and(0.207±0.0466)mg/kg with k=2,and the confidence interval was 95%.Conclusion:The developed matrix reference materials of bifenthrin and cyhalothrin in green tea are homogeneous and stable enough,and the calibration results are reliable.