摘要
目的为提高乳粉中磷检测结果的准确性。方法对干法消化和湿法消化两种方法的不确定度进行评定和比较。结果采用干法消化后测得样品磷含量为488 mg/100 g,其不确定度结果为30.0 mg/100 g,采用湿法消化后测得磷含量为495 mg/100 g,其不确定度结果为33.4 mg/100 g。结论2种检测方法对结果的准确性影响上是一致的。样品称量、标准溶液配制和样液定容体积带入的相对标准不确定度可忽略不计,标准溶液的配制及分光光度法的稳定性及样品回收率是检测结果准确与否的关键所在。
Objective To improve the accuracy of phosphorus in milk powder.Methods The uncertainty of dry digestion and wet digestion were evaluated and compared.Results The uncertainty was 30.0 mg/100 g when the phosphorus content of the sample was 488 mg/100 g after dry digestion.The uncertainty was 33.4 mg/100 g when the phosphorus content was 495 mg/100 g after wet digestion.Conclusion Two test methods have the same effect on the accuracy of the results.The relative standard uncertainty of sample weighing,preparation of standard solution and constant volume of sample solution can be ignored.The preparation of standard solution,the stability of spectrophotometry and the recovery of samples are the key to the accuracy of test results.
作者
蓝小飞
谢琳
LAN Xiao-Fei;XIE Lin(Jiaxing Institute For Food And Drug Control,Jiaxing 314001,China)
出处
《食品安全质量检测学报》
CAS
2020年第1期231-235,共5页
Journal of Food Safety and Quality
关键词
乳粉
分光光度法
不确定度
磷
milk powder
spectrophotometric
uncertainty
phosphorus