title: Specification of colour changes of metallochromic indicators in the titration of bismuth with EDTA.
abstract: The quality of the colour changes at the end-point in the complexometric titration of bismuth(III) with EDTA, using the indicators Hemotoxylin, PAN [1-(2-Pyridylazo)-Naphthol-2], PAR [4-(2-Pyridylazo)-Resorcinol], Xylenol Orange and Thoran is studied by means of the CIE 1931 trichromatic system, using specific colour discrimination (SCD) and colour difference (DeltaE*). The indicators are arranged in order of colour change quality. Of the indicators studied, Hemotoxylin is recommended as the most suitable for this titration.
authors.affiliation: School of Chemistry, Andhra University, Visakhapatnam 530 003, India.
authors.forename: K M
authors.initials: KM
authors.lastname: Prasad
authors.forename: S
authors.initials: S
authors.lastname: Raheem