Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
Add to Favorite Get Latest Update

Flow Injection Biamperometric Determination of Ascorbic Acid

Song Junfeng; Zhao Chuan; Guo Wei; Kang Xiaofeng (Institute of Electroanalytical Chemistry, Northwest University, Xi'an 710069)  
Flow injection biamperometry was used for the system consist of two irreversible couples.Employing two identical activated platinum wire electrodes with 0. 0 V potetial difference, a flow injection biamperometry for the determination of ascorbic acid was established based on the oxidation of ascorbic acid and reduction of dissolved oxygen. Under the chosen measuring conditions, the cell current is proportional to the concentration of ascorbic acid over the range of 1× 10~(-5)mol/L~ 2 ×10~(-3) mol/L.The detection limit is 8 ×10~(-6) mol/L. Using the activated electrods the sensitivity and reproducibility can be improved. The current sensitivity is 4 ~ 6 times higher than that on unactirated electrode. The RSD of 24 successive samplingr is 1. 58%. The procedure has been used for the determination of ascorbic acid in vitamin C tablet and orange juice.
【Fund】: 国家自然科学基金!29875017
【CateGory Index】: O657.1
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved