Influence of the QAS Nature and Size of a Doubly Charged Hydrophilic Inorganic iIons on the Analytical Characteristics of S4O62−, SO42−, SO32−, S2−, S2O32− Selective Electrodes
Abstract
AbstractThe effect of higher quaternary ammonium salts’ (QAS) exchange center steric accessibility and doubly charged hydrophilic inorganic ions size on the analytical characteristics of S4O62−, SO42−, SO32−, S2−, S2O32− ion selective electrodes (ISEs) was studied. It has been established that for SO42−, SO32−, S2−, S2O32− - SE with the improvement of the exchange center steric accessibility in the series TNODA - TB - TE - TM - BHPBTM - (oxyethyl)2TM - (oxyethyl)3TM - (oxyethyl)4TM the selectivity coefficients lgKPot (i, j) decrease significantly. The LDL reducing magnitude and selectivity improvement depends from doubly charged anion size and decreases in series S2− -SO32−-SO42− -S2O32− ions. The maximum effects are achieved for the smallest S2− ion. For S4O62− -SE an inverse relationship is found, i.e. as the steric availability decrease in the QAS series (oxyethyl)4TM -(oxyethyl)3TM - (oxyethyl)2TM - BHPBTM - TM - TE - TB - TNODA - TOD a certain improvement in analytical characteristics is observed.
