Adsorptive stripping voltammetric measurements of trace amounts of platinum(II) and ruthenium(III) in the presence of 1-(2-pyridylazo)-2-naphthol

Voltammetric Analysis of Trace Levels of Platinum Group Metals – Principles and Applications

“…Such a technique has been employed for the determination of several metals, but, considering only the platinum group metals, their voltammetric determination is limited to few but definite procedures, procedures, however prevalently addressed to single elements of the PGMs [68,69], so much so that, for example, the same supporting electrolyte may present, at the same potential, voltammetric signals relevant to two different PGMs, as Pt(II) and Ru(III) in the presence of 1-(2-pyridylazo-2-naphtol) as ligand [70]. Evidently, this goes against the peculiarity of the same technique, that permits to quantify simultaneously several metals carrying out single potential scans (possibility of multicomponent determination).…”

Differential Pulse Polarographic Determination of Rhodium(III) and Ruthenium(III) in Synthetic Samples after Preconcentration of Their Quinolin-8-olate Complexes onto Microcrystalline Naphthalene

“…A survey of the literature reveals that various electrochemical methods may be employed for the trace determination of rhodium and ruthenium in various materials (12)(13)(14)(15)(16)(17)(18)(19)(20)(21). Rhodium and ruthenium give catalytic polarographic waves in the presence of various complexing agents (12)(13)(14)(15)(16).…”

“…Sensitive methods may be developed based on the measurement of catalytic current, but these are highly pH, reagent concentration, and temperature dependent. These metals may also be determined by adsorptive stripping voltammetry, anodic stripping voltammetry, and adsorptive differential pulse voltammetry (17)(18)(19)(20)(21). Although these methods are sensitive, they are not sufficiently selective and reproducible.…”

Study of the Reduction of 1-(2′-Pyridylazo)-2-Naphthol in Ethanol-Water Solutions

“…PAN has been used successfully for the polarographic [4] and adsorptive stripping voltammetric [5,6] determination of traces of metal ions. For this reason the electrochemical properties of PAN such as the irreversible reduction of its azo group (Fig.…”

“…Since PAN is insoluble in water, most of the electrochemical investigations were performed in ethanol-water solutions. In 30 % (v=v) ethanol-water solution a well-de®ned reduction wave was observed at a hanging mercury drop electrode (HMDE) [5,6]. An investigation to determine the number of electrons (n) involved in the reduction of the PAN azo group in 50 % ethanol-water solution was carried out by Florence et al [4] using both polarography and controlled potential coulometry.…”