Construction of a new Ho3+ PVC-membrane electrochemical sensor based on N,N′-dipyridoxyl(1,4-butanediamine)

Abstract

N,N′-dipyridoxyl(1, 4-butanediamine) (PYBA) (2 wt % ), nitrobenzene (66 wt %), sodium tetra phenyl borate (2 wt ), and poly vinyl chloride (30 wt %) were applied to create a PVC membrane in Ho³⁺ selective electrode (Ho-SE). Over the concentration range of 1.0 × 10^‒5 to 1.0 × 10^‒2 M in holmium(III) solution a linear response with lower detection of limit equal 4.0 × 10^‒6 M was exhibited by new holmium(III) sensor. Ho-SE possessed a Nernstian slope of 20.1 ± 0.8 mV decade^‒1 in very short time spans (~9 s). The potential response of electrode remains without any changes over a pH range of 2.77–8.71. The selectivity coefficient data which was considered by matched potential method for variety of common cations indicated no significant interference. An acceptable recovery for Ho³⁺ in the blend of several cations has been achieved. The utility of Ho-SE in potentiometric titration as an end point indicator electrode gave successfully results.