Extraction-spectrophotometric determination of manganese with 3-phenyl-2-mercaptopropenoic acid

Abstract

An extraction-spectrophotometric procedure for the determination of manganese(II) based on the formation of a chelate with 3-phenyl-2-mercaptopropenoic acid is described. The 1:2 manganese complex is quantitatively extracted into isoamyl alcohol (2-methylbutan-1-ol) in the pH range 6.3–9.4. The extract shows maximum absorbance at 625 nm (ε= 7.3 × 10³ l mol^–1 cm^–1) and obeys Beer's law up to 20 µg ml^–1 of manganese. The method is selective and has been applied successfully to the determination of manganese in standard samples.