Evaluation of colour changes of indicators in the titration of cadmium with EDTA

✍ Scribed by K.M.M. Krishna Prasad; Syed Raheem

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 315 KB
• Volume: 264
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(92)85308-s

✦ Synopsis

Trlchromatlc colonmetry was apphed to the specification of c&our changes of metallochromlc mdrcators, VIZ, 4-(2-pyndylazo)resorcmol (PAR), Enochrome Black T, Bromopyrogallol Red, Solochrome Blue Black B, Pyrocatechol Violet and 1-(pyndylazo)_2-naphthol (PAN), m the complexometnc titration of cadmmm(I1) to assess the quahty of the colour change at the equivalence pomt from the CIE La*b* 1976 system and the value of the SCD (specd'ic. colour dlscnmmatlon) parameter Two screened mdlcators, PAR + Thymol Blue (5 + 3) and Enochrome Black T + Methyl Red (7 + 1) were developed m a bid to Improve the quality of colour change