Extraction-Chromogenic Systems for Vanadium(V) Based on Azo Dyes and Xylometazoline Hydrochloride

Abstract

Liquid-liquid extraction-chromogenic systems for vanadium(V) based on xylometazoline hydrochloride (XMZ) and azo derivatives of resorcinol (ADRs) were studied. The following ADRs were used: 4-(2-thiazolylazo)resorcinol (TAR), 5-methyl-4-(2-thiazolylazo)resorcinol (MTAR), and 6-hexyl-4-(2-thiazolylazo)resorcinol (HTAR). Concentration of the reagents, pH of the aqueous medium and shaking time were subjects of optimization experiments. The chloroform-extracted ternary complexes were of composition 1:1:1. The molar absorptivity coefficients (ε λ), absorption maxima (λ), constants of extraction (Log K), and fractions extracted (E%) were found to be ε 553 = 2.50 × 10 4 dm 3 mol-1 cm-1 , Log K = 3.5, and E = 96% (ADR = TAR); ε 550 = 1.88 × 10 4 dm 3 mol-1 cm-1 , Log K = 3.4, and E = 98% (ADR = MTAR); and ε 554 = 2.62 × 10 4 dm 3 mol-1 cm-1 , Log K = 5.0, and E = 99.5% (ADR = HTAR). The Sandell's sensitivities and Beer's law limits were determined as well.

Extraction-Chromogenic System for Cobalt Based on 5-Methyl-4-(2-thiazolylazo) Resorcinol and Benzalkonium Chloride

“…The following cationic reagents have been used as components of Co-PAR and Co-TAR ternary complexes: diphenylguanidine, 15 dicyclohexyl-18-crown-6, 17 tetradecyl(trihexyl)phosphonium chloride, 21 xylometazoline hydrochloride, 19 tributylammonium bromide, 22 tetraphenylarsonium chloride, 28,29 tetraphenylphosphonium chloride, 28,29 nitron, 30 tetrazolium salts, 27,[31][32][33] and quaternary ammonium salts. 16,18,20,[34][35][36] 5-Methyl-4-(2-thiazolylazo)resorcinol (MTAR) 37 is a TAR derivative that has been used in our laboratory for the liquid-liquid extraction of V IV,V [38][39][40][41][42] and Ni II . 43 Its interaction with Co II in water-ethanol medium has been studied by Kiryukhina.…”

“…Neutral or slightly basic aqueous solutions of MTAR (2.0 × 10 -3 mol dm -3 ) were prepared by the addition of KOH. 40,41 BZC was dissolved in water (c BZC = 2 × 10 -2 mol dm -3 and 4 × 10 -4 mol dm -3 ). Chloroform was redistilled and used repeatedly.…”

Extraction of Gallium(III) with a New Azo Dye in The Presence or Absence of Xylometazoline Hydrochloride

“…To increase the solubility of HTAR in water, its solution was prepared by the addition of KOH. [23] The pH values of the aqueous phase were adjusted by using ammonium acetate buffer prepared by mixing 2.0 mol dm -3 solutions of acetic acid and ammonia. The pH was monitored by a WTW InoLab 720 pH-meter (Germany).…”

“…In a previous work on vanadium(V) liquid-liquid extraction, we reported its advantages over well-known azo dyes in terms of hydrophobicity and color-forming properties. [23] The other reagent, XMH, has been used in medicine and analytical chemistry. Its cation (XMH + ) has a dispersed positive charge [24] and tends to form ion-pairs with various complex anions.…”

“…Its cation (XMH + ) has a dispersed positive charge [24] and tends to form ion-pairs with various complex anions. [22,23,[25][26][27]…”