一种含毒死蜱的黄瓜冻干粉基质标准物质的研制

Development of a standard substance for freeze-dried cucumber powder matrix containing chlorpyrifos

中文关键词:  毒死蜱  标准物质  均匀性  稳定性  定值

英文关键词:chlorpyrifos  reference material  homogeneity  stability  certified value

中文摘要:

      目的 建立了一种以黄瓜为基质的毒死蜱标准物质的制作方法。方法 黄瓜样品经研磨、加标、冷冻干燥、磨粉、混匀、真空包装后, 用GB 23200.113—2018检验样品的均匀性、稳定性, 并联合多家实验室对黄瓜冻干粉中毒死蜱基质样品定值, 同时分析样品的不确定度。结果 F-检验法和t-检验法表明在95%置信区间内, 样品均匀性、短期稳定性和长期稳定性均达到标准物质要求。采用格拉布斯和柯克伦检验对定值结果进行异常值检验, 并对结果进行不确定度评估, 样品定值为1.78 mg/kg, 不确定度为0.12 mg/kg。结论 该样品具有良好的均匀性、稳定性, 可作为蔬菜中毒死蜱含量检测使用的标准物质。

英文摘要:

      Objective To establish a preparation method for chlorpyrifos reference materials using cucumber as a substrate. Methods After the cucumber samples were ground, labeled, freeze-dried, ground, mixed and vacuum-packed, the uniformity and stability of the samples were tested by GB 23200.113—2018, and the values of chlorpyrifos matrix samples poisoned with cucumber freeze-dried powder were determined together with several laboratories, and the uncertainty of the samples was analyzed. Results The F-test and t-test methods showed that within the 95% confidence interval, sample uniformity, short-term stability and long-term stability met the requirements of standard materials. The outliers of the fixed value results were tested by Grubbs and Cochrane tests, and the uncertainty of the results was evaluated. The fixed value of the sample was 1.78 mg/kg and the uncertainty was 0.12 mg/kg. Conclusion The sample has good uniformity and stability, and can be used as a standard substance for the detection of chlorpyrifos content in vegetables.