Determination of trace amounts of vanadium in natural waters and coal fly ash with 2-(8-quinolylazo)-5-(dimethylamino)phenol by reversed-phase liquid chromatography-spectrophotometry

RETRACTED: Spectrophotometric determination of V(V) in environmental, biological, pharmaceutical and alloy samples by novel oxidative coupling reactions

“…Therefore, the determination of vanadium in environmental and biological samples is highly desirable. In survey of literature reveals that several analytical techniques have been reported for the determination of vanadium such as high performance liquid chromatography [2,3], voltammetry [4], atomic absorption spectrometry [5,6], spectrofluorimetry [7], atomic emission spectrometry [8] and ion chromatography inductively coupled plasma-optical emission spectrometry [9]. These techniques have also some limitations in terms of high cost of instruments used in routine analysis and matrix effects.…”

Determination of Cadmium, Zinc, Nickel and Cobalt in Tobacco by Reversed-Phase High-Performance Liquid Chromatography with 2-(8-Quinolylazo)-4,5-diphenylimidazole as a Chelating Reagent

“…It has been used as a powerful technique for the simultaneous determination of metal ions. 14,15 This method shows the advantages of low cost, excellent selectivity and sensitivity; several groups of ligands such as azo compounds, 16,17 oxine and its derivatives 18,19 and dithiocarbamic acid 20,21 were used as derivatizing agents for the RP-HPLC determination of various metal ions.…”

“…Generally, these compounds are suitable for the precolumn derivatization of V(V), Co(II) and Ni(II) in the RP-HPLC separation and determination. 16,17 Labile chelates such as Cd(II) and Zn(II) chelates with azo compounds are forced to dissociate during the elution unless the reagent stream is used as an eluent; specially, there are few papers on the determination of Cd(II) by RP-HPLC using any azo compounds. In this study, 2-(8-quinolylazo)-4,5-diphenylimidazole (QAI) was examined for the determination of Cd(II) and Zn(II) by the precolumn derivatization RP-HPLC.…”

Adsorptive stripping voltammetric determination of vanadium(V) witch chloranilic acid using cyclic renewable mercury film silver based electrode

“…Thus a sensitive method of determining vanadium is necessary for studying diseases involving lack of vanadium or its excess. The analytical methods most often used to determine of vanadium in environmental samples are atomic absorption spectrometry [3,4], spectrofluorimetry [5], atomic emission spectrometry [6], high performance liquid chromatography [7,8], ion chromatography inductively coupled plasma-optical emission spectrometry [9] and voltammetry [10]. Unfortunately few of them have poor sensitivity to determine vanadium at ultra-trace level in natural water samples.…”