基于光纤折射率传感原理的新颖酸碱滴定法  

A Novel Acid-base Titration Based on Fiber Refractive Index Sensor Principle

作　　者：黄振健[1] 谭春华[1] 黄旭光[1] 

机构地区：[1]华南师范大学光子信息技术广东省高校重点实验室,广州510006

出　　处：《化学学报》2010年第11期1098-1102,共5页Acta Chimica Sinica

基　　金：国家重点基础研究发展计划(973计划)(No.2010CB327805);广东省科技计划项目(No.2009B090300190)资助项目

摘　　要：首次提出并研究了一种基于光纤折射率传感原理的新颖的化学酸碱滴定分析方法,为光纤传感技术在化学滴定分析的新应用作出了有意义的尝试.实验结果表明:此方法适应于酸碱互滴,只需少量样品;在待测样品浓度较低时,采用浓度高的滴定剂效果更佳,可测量浓度低至0.001mol/L的溶液;与传统的pH滴定方法等比较,本方法无需添加终点指示剂,可实现实时监控;在二元酸碱的滴定中,化学计量点指示更明确,精度更高;稳定性和准确性测试效果良好,对HNO3,NaOH进行测定RSD分别为0.23%和0.28%.A novel acid-base titration based on fiber refractive index sensor principle is first proved and studied in this paper. It is a significant attempt for the optical fiber sensing technology application to chemical titration analysis. The experimental results show that this method is adapted to titration acids with bases and vice versa, and requires very small sample volumes. It is suitable that concentrated solution used to be the titrant when the sample is diluted solution. By adopting this method, the solution of 0.001 moFL can be measured accurately. Compared to the traditional pH titration, end point indicator is unnecessary in this method, and real-time monitoring can be realized. In titration binary acid/base with base/acid, the end point is more explicit and higher accuracy can be obtained. The RSD of measurement of HNO3, NaOH is 0.23% and 0.28% respectively, which show that text results of repeatability and accuracy is satisfactory.

关 键 词：光纤传感 折射率 酸碱滴定 化学分析 

分 类 号：O655.22[理学—分析化学]