摘要
建立菠菜冻干粉中噻虫嗪、噻虫胺能力验证样品的制备方法。以空白菠菜为基质,添加不同浓度的噻虫嗪、噻虫胺标准溶液,采用冷冻干燥的方式制备菠菜冻干粉中能力验证样品。依据CNAS-GL003:2018《能力验证样品均匀性和稳定性评价指南》对样品的均匀性和稳定性进行评价。组织并实施菠菜粉中噻虫嗪与噻虫胺检测的能力验证。利用Z比分数对参加实验室结果进行评价。均匀性实验评价采用F检验法,样品均匀性实验F值为1.03~1.60,均小于查表值F_(0.05(9,10))=3.02。稳定性实验采用t检验法,样品稳定性实验t值为0.12~1.72,均小于查表值t_(0.05(24))=2.064。结果表明,制备的菠菜冻干粉中噻虫嗪和噻虫胺能力验证样品均匀性良好,常温保存条件下,噻虫嗪和噻虫胺含量稳定,可用于人员考核等领域的质量控制和实验室的能力验证。
Establish a method for the preparation of proficiency testing samples of thiamethoxam and clothianidin in lyophilized spinach powder.Blank spinach was used as the substrate,different concentrations of thiamethoxam and clothianidin standard solutions were added,and the proficiency testing samples in lyophilized spinach powder were prepared by freeze-drying.The uniformity and stability of samples were assessed according to the CNAS-GL003:2018 Guidelines for the Evaluation of Uniformity and Stability of Samples for Capability Verification.The proficiency testing of thiamethoxam and clothianidin in spinach powder was organized and implemented.The Z ratio score was used as the statistic to evaluate the test results of the participating laboratories.The F-test method was used to evaluate the homogeneity experiment,and the F value of the sample uniformity experiment was 1.03-1.60,which was lower than the table value F_(0.05(9,10))=3.02.The t test method was used in the stability experiment,and the t value of the sample stability experiment was 0.12-1.72,which was also lower than the table value t_(0.05(24))=2.064.The results showed that the uniformity of thiamethoxam and clothianidin in the prepared spinach freeze-dried powder could meet the requirements,and the contents of thiamethoxam and clothianidin were stable under room temperature storage conditions,which could be used for quality control in personnel assessment and proficiency testing in laboratories.
作者
杨雯筌
李寒玲
杜好
黄娟
余本渊
王凯民
YANG Wenquan;LI Hanling;DU Hao;HUANG Juan;YU Benyuan;WANG Kaimin(Animal,Plant and Food Inspection Center,Nanjing Customs,Nanjing 210019)
出处
《食品工业》
CAS
2024年第4期9-12,共4页
The Food Industry
基金
2023KJ44海关实验室能力验证的评价体系的建立和研究项目来源:南京海关科研项目。
关键词
能力验证
菠菜粉
噻虫嗪
噻虫胺
均匀性
稳定性
proficiency testing
spinach powder
thiamethoxam
clothianidin
uniformity
stability
