不同非线性曲线拟合方式对乳饮料中蔗糖含量的不确定度评定

Evaluation of the uncertainty of sucrose content in milk beverage by different nonlinear curve fitting methods

中文关键词:  高效液相色谱法  不确定度  非线性拟合

英文关键词:high performance liquid chromatography  uncertainty  nonlinear fitting

中文摘要:

      目的 研究2种不同非线性曲线拟合方式对乳饮料中蔗糖检出限含量的不确定度评定。方法 参考JJF 1059—2012《测量不确定度评定与表示》, 采用变量代换和乘幂方式的线性化法, 通过高效液相色谱-蒸发光散射检测器法测定乳饮料中蔗糖的含量方法建立数学模型, 对各个不确定度因素进行评估。结果 蔗糖平均含量为0.21 g/100 g, 变量代换线性化法扩展不确定度为27.8%, 乘幂方式的线性化法扩展不确定度在95%置信区间下为3.3%。k=2。结论 乘幂方式的线性化法适用于不确定度的评定。

英文摘要:

      Objective To study the uncertainty evaluation of sucrose detection limit in milk drinks by 2 different nonlinear curve fitting methods. Methods Referring to JJF 1059—2012 Evaluation and expression of measurement uncertainty, a mathematical model was established for the determination of sucrose content in milk beverage by means of variable substitution and power-up linearization, and the method of high performance liquid chromatography evaporative light-scattering detector was used to evaluate each uncertainty factor. Results The average sucrose content was 0.21 g/100 g, the expansion uncertainty of variable substitution linearization method was 27.8%, and the extended uncertainty of the power-up linearization method was 3.3% under 95% confidence interval, k=2. Conclusion The linearization method of power mode is suitable for the evaluation of uncertainty.