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Liquid-liquid extraction systems containing FeIII, 4-(2-thiazolylazo)resorcinol (TAR), and a ditetrazolium salt (DTS: Neotetrazolium chlortide, Blue Tetrazolium chloride, or Nitro Blue Tetrazolium chloride), water and chloroform were investigated. The optimum conditions for iron extraction, some equilibrium constants (association constants, distribution constants, and extraction constants), and characteristics (molar absorptivities, Sandell's sensitivities, limits of detection and quantification) were found. The extracted species are ternary complexes with a general formula of (DT2+)(FeII(TAR) 2 ). In this formula the metal ion is in oxidation state II, the azo dye is in doubly deprotonated form (TAR 2" ), and the ditetrazolium cation (DT) has a charge of 2+.

Extraction-Chromogenic Systems Containing Iron(III), 4-(2-Thiazolylazo)resorcinol and Ditetrazolium Salts