Analytical control of silica glass production. Voltammetric determination of titanium and iron in raw materials and silica glass samples

Novel, Sensitive Voltammetric Methods for Titanium Determination Using Chromotropic Acid and Azo‐Compounds as Complexing Agents

“…It was a disadvantage of these methods, as great improvement in the sensitivity of titanium determination can be obtained by coupling the catalytic effect of chlorate ions with AdSV determination. This phenomenon was first described by Koryta and Tengyl [17] for oxalate and was followed by other examples of the similar systems: with mandelic acid [18,19], pyrocatechol violet [13] or triphenylmethane dyes [20]. In the previous article the authors have described catalytic systems with triphenylmethyl compounds for titanium determination in the presence of chlorate ions [21].…”

Sensitive adsorptive stripping voltammetric method for determination of trace concentration of titanium in the presence of chloranilic acid as a complexing agent

“…A comparison of the analytical performance of the proposed method with other methods reported so far for the adsorptive stripping voltammetric [4][5][6][7][8][9][10][11][12][13] and catalytic voltammetric determination of Ti(IV) [15] is listed in Table 2. On the basis of literature survey, the mercury electrodes in HMDE construction were mostly applied for the adsorptive voltammetric stripping analysis of trace Ti(IV).…”

“…Using adsorptive voltammetry stripping (AdSV) analysis, an extremely useful, sensitive and versatile preconcentration scheme can be achieved by controlled accumulation of metal complexes onto the working electrode [3]. Owing to a widespread popularity of AdSV, several complexing agents have been studied for the adsorptive collection of complexes with titanium, such as mandelic acid [4][5][6][7], oxalate [8], cupferron [9], pyrocatechol violet [10], diphenylguanidine and Beryllon III [11], methylthymol blue, xylenol orange and calcein [12], chromotropic acid and azo-compounds [13]. The vast majority of these procedures were developed using hanging mercury drop electrodes [4,6,7,[9][10][11][12][13] or a mercury film electrode [5], only in one procedure a different kind of electrode was applied, that is a modified carbon paste electrode [8].…”

Application of the Bismuth Film Electrode for Voltammetric Determination of Titanium Using Ti(IV)‐Oxalate‐Chlorate Catalytic System

“…Some of these complexes may induce catalytic reactions, which offer an additional increase in the sensitivity. Catalytic-adsorptive systems such as Ti(IV)-ligand-chlorate, in which one of the following substances may act as the ligand: mandelic acid [22,23], pyrocatechol violet [24], Ti(IV)-methylthymol blue [25], xylenol orange and calcein [25], triphenylmethane dyes [26] and kalces [27], are used in the most sensitive methods of Ti(IV) determination and find application in its trace analysis [8].…”