离子色谱法测定地下水中硝酸盐氮含量的不确定度评定

Uncertainty Evaluation of Content of Nitrate in Underground Water by Ion Chromatography

中文关键词:  不确定度  回归方式  硝酸根  离子色谱法

英文关键词:uncertainty  regression method  nitrate  ion chromatography

中文摘要:

      采用不确定度连续传递模式，讨论了不同回归方式对离子色谱法测定岩溶地下水中硝酸根分析结果不确定度评定的差异.结果表明：（1）测定结果的不确定度主要来源于标准溶液配制过程引入的不确定度、校准曲线拟合及回归过程产生的不确定度和仪器测定过程引入的不确定度三部分；（2）不同校准曲线回归方式对测定结果的不确定度评定在不同测量水平上有不同的影响，当地下水中硝酸根含量越低，差异越大.此外，对不确定度评定过程中的各个分量进行量化，通过合成得到硝酸根测定结果的不确定度评定模型.

英文摘要:

      In order to set up an evaluation method of measurement uncertainty for the determination of nitrate in karst underground water by the ion chromatographic detection technology, the continuous propagation model of uncertainty is used. The differences among different regression methods are also discussed. The results show that:(1) the main sources of measurement uncertainty come from the sub-uncertainties of calibration solutions, calibration curve fitting and measurements process. (2) different regression methods have different effects on the uncertainty evaluated at different levels. The lower the nitrate content in underground water is, the greater the different is. In addition, based on the quantitative analysis of each uncertainty component through experimental results, the standard uncertainty model for nitrate determination results is obtained.