Evaluation of the quality of colour changes of complexometric indicators in the titration of copper (II) with EDTA by tristimulus colorimetry |
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Authors: | Kommuri M M Krishna Prasad Syed Raheem |
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Institution: | (1) Physical Chemistry Research Laboratories, School of Chemistry, Andhra University, 530 003 Visakhapatnam, India |
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Abstract: | The quality of colour changes of the indicators hematoxylin, 4(2-pyridylazo)resorcinol (PAR), xylenol orange, pyrocatechol violet, chromazurolS and eriochrome cyanineR in the complexometric titration of copper(II) with ethylenediaminetetraacetic acid (EDTA) were studied with the help of tristimulus colorimetry, utilising a comparative study of the parameters SCD (specific colour discrimination), CIE La*b* 1976 and LABHNU 1977. Hematoxylin was found to be the best indicator among those studied. A screened indicator, viz. PAR + malachite green (52), was developed to enhance the quality of colour transition at the end-point and the accuracy of the titrimetric determination. |
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Keywords: | tristimulus colorimetry complexometric titration copper(II) PAR indicator |
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