离子色谱法检测泡菜中亚硝酸盐含量的校准曲线线性性能评价

Linear performance evaluation on calibration curve of determination of nitrite in pickles by ion chromatography

中文关键词:  泡菜  亚硝酸盐  离子色谱  校准曲线  线性性能  质量控制

英文关键词:pickles  nitrite  ion chromatography  calibration curve  linear performance  quality control

中文摘要:

      目的 评价校准曲线线性性能。方法 以离子色谱法检测泡菜中亚硝酸盐的校准曲线制作为实验内容, 研究线性范围、工作范围,并进行校准曲线的质量检验。结果 检验方法的工作范围决定于校准曲线线性范围和样品中目标组分的含量范围; 相关系数不能全面反映校准曲线的质量; 在使用校准曲线前, 还应进行曲线是否通过原点(有要求时)和拟合误差检验; 校准曲线上各浓度点应均匀布置, 并且第一个非零浓度点最好高于定量限。结论 根据检测工作的实际需要, 校准曲线的工作范围应在线性范围内灵活确定, 还应进行校准曲线质量检验。

英文摘要:

      Objective To evaluate the linearity of the calibration curve. Methods Based on experiments for calibration curve of determination of nitrite in pickles by ion chromatography, range of linear, range of working calibration, and quality of calibration curve were investigated. Results The working range of the test method depended on the linear range of the calibration curve and the content range of the target component in the sample. Correlation coefficient could not reflect overall the quality of calibration curve. Before using the calibration curve, it was also necessary to check whether the curve passed through the origin (if required) and the fitting error. All concentration points on the calibration curve should be evenly distributed, and the first non-zero concentration point should preferably be higher than the limit of quantitation. Conclusion According to the actual needs of testing, the working range of calibration curve should be determined flexibly within the linear range. Moreover, the quality of calibration curve should be investigated.