DERIVATIVE DYNAMIC-RESPONSE OF ION-SELECTIVE ELECTRODES - APPLICATIONTO THE PRECIPITATE-BASED IODIDE-SELECTIVE ELECTRODE IN THE PRESENCE OF INTERFERING IONS
C. Sanchezpedreno et al., DERIVATIVE DYNAMIC-RESPONSE OF ION-SELECTIVE ELECTRODES - APPLICATIONTO THE PRECIPITATE-BASED IODIDE-SELECTIVE ELECTRODE IN THE PRESENCE OF INTERFERING IONS, Analytica chimica acta, 315(1-2), 1995, pp. 63-67
The concept of the derivative dynamic response (dE/dt) of ion-selectiv
e electrodes is introduced to study the response of a precipitate-base
d iodide-selective electrode in the presence of interfering ion, using
a now injection system and a flow-through cell. A type of concentrati
on perturbation is assayed in which the primary ion is completely remo
ved while the interfering ion is introduced. The effects of interferin
g ion concentration and flow rate on the derivative dynamic signals ar
e studied. A new well-defined peak appears in the presence of bromide
interfering ion. The peak height increases with bromide concentrations
in the range of 10(-5) to 10(-2) M. In the case of chloride interferi
ng ion the new peak is only appreciable at greater than or equal to 10
(-2) M.