Blank membranes versus ionophore-based membranes for the selective determination of H+
Analytical Sciences the International Journal of the Japan Society for Analytical Chemistry 25(9): 1131-1135
ISSN/ISBN: 1348-2246 PMID: 19745542 DOI: 10.2116/analsci.25.1131
A pH electrode for the selective determination of H+ was introduced. Both phosphorated calixarene and a N,N'-bisethoxycarbonyl-1,10-diaza-4,7,13,16-tetraoxacyclo-octadecane (DZCE) were used as new H+-ionophores. The calibration graphs of the obtained electrodes exhibits satisfactory Nernstian slopes. The electrodes were compared to blank membranes (without any ionophoric substances) for the first time. Selectivity coefficients of the studied electrodes towards several inorganic cations were calculated. The relative selectivity coefficient (RSC) was applied for evaluating the selectivity properties of H+-electrode using a mathematical equation. The electrodes were applied for the determination of different inorganic and organic acids.