摘要
利用自动电位滴定方法对食用植物油中过氧化值和酸值进行测定,通过建立不确定度数学模型,分析和计算试验过程中影响过氧化值和酸值测量结果的不确定度分量和扩展不确定度。测试结果表明:食用植物油的过氧化值平均值为1.22 mmol/L,酸值平均值为1.43 mg/g,其过氧化值项目扩展不确定度为0.016 mmol/L,酸值扩展不确定度为0.044 mg/g,置信因子k=2,测量重复性是影响过氧化值和酸值实验结果不确定度的主要因素。
The peroxide value and acid value in edible vegetable oil were determined by automatic potentiometric titration.Through the establishment of uncertainty mathematical model,the uncertainty components and expanded uncertainty affecting the peroxide value and acid value measurement results were analyzed and calculated.The test results showed that the average peroxide value of the edible vegetable oil was 1.22 mmol/l,the average acid value was 1.43 mg/g,the expanded uncertainty of peroxide value was 0.016 mmol/l,the expanded uncertainty of acid value was 0.044 mg/g,the confidence factor k=2,and the repeatability of measurement was the main factor affecting the uncertainty of the test results of peroxide value and acid value.
作者
王志强
叶建斌
李栩欣
彭焱辉
吴凌涛
WANG Zhi-qiang;YE Jian-bin;LI Xu-xin;PENG Yan-hui;WU Ling-tao(Guangdong Provincial Key Laboratory of Emergency Test for Dangerous Chemicals,Guangdong Institute of Analysis(China National Analytical Center Guangzhou),Guangdong Academy of Sciences,Guangzhou,Guangdong 510070,China)
出处
《粮油食品科技》
2020年第6期195-199,共5页
Science and Technology of Cereals,Oils and Foods
基金
广东省科学院发展专项资金项目(2019GDASYL-0105015)。
关键词
自动电位滴定法
植物油
过氧化值
酸值
不确定度
automatic potentiometric titration
vegetable oil
peroxide value
acid value
uncertainty
