植物油中过氧化值含量的合格概率评定与符合性判定

Conformance probability evaluation and conformity assessment of peroxide value content in vegetable oils

目的对合格概率进行评定,确定一个具体的合格概率值。方法根据CNAS-TRL-010:2019《测量不确定度在符合性判定中的应用》中的合格概率计算公式求得合格概率。结果本次评定,容许限上限Tu=0.25 g/100g、过氧化值检测值y=0.247 g/100g、合成标准不确定度u=0.003 g/100 g,合格概率P=84.1%。结论对于本次检验结果的符合性判定,实验室可与客户协商选择可以使符合性判定结论为合格的判定规则,以减小误判风险。

Objective To evaluate the conformance probability,and to determine a specific conformance probability value.Methods According to the calculation formula of conformance probability in CNAS-TRL-010:2019 Application of uncertainty of measurement in conformity assessment,the conformance probability was obtained.Results The tolerance limit(Tu)was 0.25 g/100 g,the measured value of peroxide value(y)was 0.247 g/100 g,the combined standard uncertainty(u)was 0.003 g/100 g,the conformance probability(P)was 84.1%.Conclusion For the conformity assessment of the measurement results,the laboratory can negotiate with the customer to select the decision rules that can make the conformity assessment conclusion qualified,so as to reduce the risk of misjudgment.