CAJ | 학술논문

目的对硫酸锌返滴定法测定食品添加剂磷酸二氢钙含量的测量不确定度进行评定,确保检测结果准确可靠.方法按照测量不确定度评定的通用规则,建立了数学模型,分析了方法中的不确定度分量及其来源,计算了各分量的不确定度,最后计算出了检测结果的合成标准不确定度和扩展不确定度.结果扩展不确定度为0.10%, K=2.结论标准溶液产生的相对标准不确定度及用硫酸锌溶液滴定产生的不确定度是硫酸锌返滴定法测定食品添加剂磷酸二氢钙含量的主要影响因素.
목적대류산자반적정법측정식품첨가제린산이경개함량적측량불학정도진행평정,학보검측결과준학가고.방법안조측량불학정도평정적통용규칙,건립료수학모형,분석료방법중적불학정도분량급기래원,계산료각분량적불학정도,최후계산출료검측결과적합성표준불학정도화확전불학정도.결과확전불학정도위0.10%, K=2.결론표준용액산생적상대표준불학정도급용류산자용액적정산생적불학정도시류산자반적정법측정식품첨가제린산이경개함량적주요영향인소.
Objective The uncertainty of the detection results of calcium dihydrogen phosphate using back titration analysis of zinc sulfate has been evaluated, which ensure the detection results accurate and reli-able. Methods According to general rule of evaluation of the measurement uncertainty, mathematical model was established and the measurement uncertainty for the determination of calcium dihydrogen phosphate using back titration analysis of zinc sulfate was analysed. Finally, combined standard uncertainty and the extended un-certainty of detection results were calculated. Results The extended uncertainty was 0.10%(K=2). Conclusion Relative standard uncertainty caused by standard solution and uncertainty caused by titration analysis of zinc sulfate were the main factors for the determination of calcium dihydrogen phosphate using back titration analy-sis of zinc sulfate.