双误差回归评估氟化物测定的不确定度和检出限

Uncertainty Evaluation for Fluoride Determination Using Double-Error Regression

本文采用不确定度连续传递模式,建立离子色谱法测定岩溶地下水中氟离子分析结果不确定度的评定模型。采用x、y的相对差,对校准曲线进行双误差回归,对评定过程中各个不确定度分量进行量化,最后通过计算合成得到氟离子测定结果的不确定度评定模型。氟离子测定结果的不确定度主要包含标准溶液引入的不确定度、曲线拟合产生的不确定度和测定过程引入的不确定度三部分。

An uncertainty evaluation method for fluoride determination in karst underground water by ion chromatography detection technology was proposed. Using continuous propagation model of uncertainty, the fluoride measurement uncertainty was evaluated. The double-error regression was used in the process of standard curve fitting. Based on the quantitative analysis of each uncertainty component during experimental results ,the standard uncertainty model for sulfate determination results was obtained. The main sources of measurement uncertainty came from sub-uncertainties of calibration solutions, calibration curve fitting and measurements process.