The solvent extraction and spectrophotometric determination of vanadium (V) with 4-(2-thiazolylazo)resorcinol and tetrazolium salts

Abstract

Abstract:The formation and extraction of ion-associate complexes between the vanadium(V) -4-(2-thiazolylazo)resorcinol (TAR) anionic chelate and the cations of some mono-and ditetrazolium salts {3- (4,5-dimethyl-2-thiazol-tetrazolium] chloride (Tetrazolium blue chloride) and 3,3'-(3,3'-dimetoxy-4,4'-biphenylene)bis[2-(4-nitrophenyl)-5-phenyl-2H-tetrazolium chloride] (Nitro blue tetrazolium chloride)} have been studied. The optimum extraction conditions have been found. The composition of the V-TARmonotetrazolium and V-TAR-ditetrazolium complexes extracted into chloroform has been determined to be 1:2:3 and 2:4:3 respectively. The extraction, distribution and association constants, and the recovery factors have been calculated. The relationship between the molecular weight of tetrazolium cations, and the association constants of their complexes has been discussed. The special behavior of the tetrazolium cations, containing -NO 2 groups has been noticed. The effects of foreign ions and reagents on the extraction of vanadium with TAR and the best tetrazolium salt -MTT have been studied. A sensitive, selective, simple and fast method for the determination of vanadium has been developed.

Some Ternary Phenylmethoxybis(tetrazolium) Complexes of Vanadium(IV,V) and Their Constants of Association

“…However, some further investigations showed that this statement is not valid for IACs, which include NO 2 group(s) containing T m+ . 10,19,20 In fact, the values of β of such IACs are considerably lower than the expected ones according to literature. 11,18 Next step of investigation on the problem was to compare the values of β for IACs with T m+ , which differs only by the number of NO 2 groups (N nitro ).…”

“…10,11,[18][19][20] Alexandrov et al 11,18 disclosed the first factor: the higher the molecular mass, the higher the association constant. However, some further investigations showed that this statement is not valid for IACs, which include NO 2 group(s) containing T m+ .…”

“…11,18 Next step of investigation on the problem was to compare the values of β for IACs with T m+ , which differs only by the number of NO 2 groups (N nitro ). 21 For this purpose, the association constants of IACs between some phenylmethoxybis(tetrazolium) cations (MBT 2+ ), in which N nitro = 0, 2, and 4 (Table 1), and the vanadium(V) -4-(2-pyridyl-azo)-resorcinol anionic chelate 10,21,22 [VO 2 (PAR) 2 ] 3-were determined. The obtained results suggested that a linear relationship exists between log β and N nitro : the higher N nitro , the lower log β (Figure 1, straight line 1).…”

A novel indicator reaction for the catalytic determination of V(V) at ppb levels by the kinetic spectrophotometric method

“…Different methods such as ICP-MS, ICO-AES, NSAA, AAS, and spectrophotometry [6][7][8][9][10][11][12] are most frequently used for the determination of vanadium compounds. However, the relatively high instrumental cost and need for preconcentration, chromatographic separation, extraction or coprecipitation are common disadvantages.…”

Development and validation of the simple and sensitive spectrophotometric method of sulphanilamides determination with 4-(2-thiazolylazo)-resorcinol in veterinary preparations

“…TAR is widely known in inorganic analysis as a spectrophotometric reagent for the spectrophotometric determination of platinum [8] and transition [9][10][11] metals. TAR was used in ion-exchange liquid [12][13][14][15][16] and thin-layer [17] chromatography for the determination of metals ions in natural and drinking water as well as for electrophoretic determination of metals [18][19][20], in optical [21][22][23] and ionselective [24,25] sensors to determine the metals ions, for obtaining of the sorbents modified by azo reagent for concentration metals ions [26][27][28][29][30].…”