Liquid Ion Exchanger Membrane Electrode Sensitive to Perrhenate and Thiocyanate; U-Shaped Potentiometric Titration Curves

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Abstract
The Orion Perchlorate Ion Activity Electrode also is sensitive to perrhenate and thiocyanate activities. Response is Nernstian over several orders of magnitude, with detection limits about 10−6 F for perrhenate and 10−5 F for thiocyanate. Titrations can be carried out with ±0.5% relative standard deviations at the 10−1 to 10−2 F concentration level. Titration curves for addition of mercury (II) to thiocyanate, chloride, bromide, and iodide are U-shaped. The electrode appears to be highly sensitive to the anionic mercury-halide complexes formed in the early stages of these titrations. The data are consistent with the stabilities of the complexes.