期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 12, 期 9, 页码 1195-1198出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2010.06.017
关键词
Ion-selective electrode; Calcium ionophore; Ion transfer voltammetry; Calibration free sensing; Thin layer coulometry; Polypropylene hollow fiber membrane
资金
- Australian Research Council [DP0987851]
- CSIRO
- National Institutes of Health [R01-EB002189]
A promising method for the elimination of undesired capacitive currents in view of realizing a potentially calibration free coulometric ion detection system is presented. The coulometric cell is composed of a porous polypropylene tube doped with a liquid calcium-selective membrane and a silver/silver chloride wire as an inner electrode, forming a thin layer sample between wire and tubing. The total charge passed through the system during potential controlled electrolysis of the thin layer sample is indeed found to be proportional to the amount of calcium present, but non-Faradaic processes do contribute to the obtained signal. We introduce here a multi-pulse procedure that allows one to perform a second excitation pulse at the same excitation potential after exhaustive ion transfer voltammetry of calcium has taken place. The intercept of the calibration curve after background subtraction is found as 20.6 +/- 0.6 mu C. significantly lower than the value of 54.1 +/- 0.8 mu C for the uncorrected curve. Changes in sample temperature (from 23 C degrees to 38 degrees C) did equally not affect the background corrected coulometric readings, supporting that the procedure renders the readout principle more robust. (C) 2010 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据