Ion Selective Electrodes Based on Brilliant Green Tetrathiocyanatezincate(II)

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Abstract
Liquid state, heterogeneous silicone rubber and carbon paste electrodes based on Brilliant green tetrathiocyanatozincate(II) have been prepared and studied. The liquid state electrode, consisting of a 10−3 M solution of Brilliant green tetrathiocyanatozincate(II) in o-dichlorobenzene supported on lightly cross-linked natural rubber, was the most satisfactory. This electrode responded rapidly when placed in 10−4 to 10−1 M solutions of zinc containing a twenty-fold excess of thiocyanate. The potential concentration slope (-29.5 mV per decade change in concentration) was that 2-expected for response to Zn(SON)4 2-. The silicone-rubber and carbon paste electrodes also gave near-Nernstian response, but responded more slowly.