Ion-association formation of tungstate with methyl violet 2B in acetone-aqueous medium by solvent extraction-spectrosphotometry method and apply in analysis

  • Lâm Ngọc Thụ
  • Lâm Ngọc Thiềm
  • Vi Anh Tuấn


The interaction of tungsten(Vl) with M2B has been investigated in acetone-aqueous medium.. The complex has been examined hy solvent extraction-spectrophotometry method. In optimum conditions (pH 3: 30% (v/v) acetone) the ion-association complex of tungsten(VI) with M2B was formed with ratio 2:1, and it was extracted quantitatively one time with 5 mL toluene. In organic phase, the complex has maximum absorption al 591 nm, and stable at least 2 hours after extraction. The complex is formed completely when concentration of M2B is three times of that of tungsten(VI). Concentration of molybdenum(VI) up to 200 times of that of tungsten(Vl) did not interfere. The results have shown that absorbance of the complex obeys Beer's law in a rather large range. Therefore, the complex could be used for micro determination of tungsten(VI) in steel.

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