• 分析检测 •

### 离子色谱法测定泡菜中亚硝酸盐的测量不确定度评定

1. 1.广州大学环境检测中心 2.中山市供水有限公司水质检测中心
• 出版日期:2011-11-25 发布日期:2011-11-11
• 基金资助:
国家自然科学基金青年基金项目(40903040)

### Uncertainty Evaluation of Nitrite Determination in Pickles by Ion Chromatography

ZHAN Yong-ge1，HUANG Xiang-yan2，GONG Jian1

1. (1. Guangzhou University Environment Detection Center, Guangzhou 510006, China； 2. Detection Center for Water Quality, Zhongshan City Water Supplied Co. Ltd., Zhongshan 528403, China)
• Online:2011-11-25 Published:2011-11-11

Abstract: To investigate the influence of data processing on the expanded uncertainty accuracy in the chemical determination of nitrite in pickles, the uncertainty components of calibration curve were fitted with a general linear model and a more rigorous nonlinear model, respectively. Meanwhile, the uncertainty components of solution volume were assessed with a general body expansion coefficient method and a more strict density correction method, respectively. The uncertainty components of spike recovery were evaluated using an approximate formula and a more rigorous formula. The results showed that the expanded uncertainty accuracy obtained from the strict method was higher than that from the general method. For those test results close to the limited boundary, the strict methods, but not the general methods could be used to evaluate the quality of nitrite determination. When the correct testing process is followed, a higher and reasonable evaluation accuracy can be achieved using real data.