Calcium-Selective Electrodes for Measurements in the Presence of Anionic Surfactants

被引：4
作者：
Ivanova, Natalia M. [1 ]
Bart, Tatiana Ya [1 ]
Grekovich, Alexander L. [1 ]
Mikhelson, Konstantin N. [1 ]
机构：
[1] St Petersburg State Univ, St Petersburg 198504, Russia
来源：
ELECTROANALYSIS | 2011年 / 23卷 / 08期
关键词：
Sensors; Calcium-selective electrodes; Surfactants; Sodium dodecylsulfate; POTENTIOMETRIC RESPONSE; NONIONIC SURFACTANTS; COEFFICIENTS; IONOPHORES; MECHANISM; MODEL;
D O I：
10.1002/elan.201100131
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Calcium selective electrodes with various membrane formulations were studied in solutions containing CaCl2 and sodium dodecylsulfate (NaDS). It is shown that electrodes based on neutral ionophores ETH 1001 and ETH 129 cannot be used as Ca2+ ion sensors in these solutions because of strong anion interference from DS- anion. Among other formulations, that based on calcium bis(tetramethylbutylphenyl)phosphate in tri(2-ethylhexyl)phosphate appear the most promising. The interpretation of the ISE response in solutions under study relied on a novel approach which considers three forms of calcium: Ca2+ free ions, Ca in Ca(DS)(2) precipitate, and Ca2+ bound by the DS- micelles. Data needed for the respective calculations were obtained by DS- selective electrode based on tetradecylammonium, and Na+ selective glass electrode.
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页码：1805 / 1813
页数：9
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