Liquid-membrane dodecylbenzenesulphonate ion-selective electrode employing Victoria Blue as the counter-ion.
The dodecylbenzenesulphonate anion forms an ion-pair with the Victoria Blue cation and this is easily extracted into nitrobenzene. It was found that the calibration curve of the dodecylbenzenesulphonate ion-selective electrode based on this system shows good linearity in the range 10(-3)-10(-7)M. Selectivity coefficients were evaluated for some anions. The results indicated a poor tolerance towards dodecyl sulphate, perchlorate and periodate. Dodecyl sulphate, dodecylbenzenesulphonate and several kinds of synthetic anionic detergents have been successfully titrated potentiometrically with a solution of Zephiramine (benzyldimethyltetradecylammonium chloride) by using the electrode as an indicator electrode.
Kobayashi
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Division of Environmental Conservation, Graduate School of Environmental Science, Hokkaido University, Sapporo, Japan.
Kataoka
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Kambara
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