Complexometric estimation of copper

Abstract

Copper(II) or Copper(II) and iron(III) in a mixture are determined by titration with EDTA (disodium salt) solution as complexometric reagent at pH 4.0 using potassium thiocyanate-p-anisidine as an indicator. FeIII is estimated in the mixture by titration with EDTA (disodium salt) solution using potassium thiocyanate-ether as an indicator. CuII present in the mixture is, therefore, equivalent to the difference in amounts of the EDTA (disodium salt) used for the two sets of titrations of the mixture using potassium thiocyanate-p-anisidine and potassium thiocyanate-ether as indicators respectively. Strontium, magnesium, manganese, calcium, barium and mercuric ions do not interfere in these estimations.