Abstract
The specification of colour changes of nitritometric indicators, viz., cresyl fast violet acetate, amethyst violet, safranine O, neutral red, methylene violet, neutral violet, phenosafranine, brilliant cresyl blue and lissamine blue BF, in the titration of sulphanilamide has been carried out with the help of tristimulus colorimetry. Apart from the determination of true colour co-ordinates and complementary colour co-ordinates, the quantitative parameters specific colour discrimination (SCD), total colour difference (ΔE*) values of CIE La*b*, CIE Lu*v* and LAB HNU colour spaces together with the standard deviation of colour matching (ΔS) were also evaluated for all the indicators at different concentrations ratios of nitrite and sulphanilamide, for a quantitative measure of quality of colour change. The quality of colour change of many of the studied indicators is further improved by screening with appropriate inert colorants to obtain a colour transition between complementary colours through colourlessness at the equivalence point.
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References
R. Rama Krishna, P. Siraj, C. S. Prakasa Sastry,Acta Ciencia Indica 1978,4, 345.
R. Rama Krishna, P. Siraj, C. S. Prakasa Sastry,Indian J. Pharm. Sci. 1978,40, 69.
R. Rama Krishna, P. Siraj, C. S. Prakasa Sastry,J. Indian Chem. Soc. 1980,57, 414.
C. S. Prakasa Sastry, R. Rama Krishna,Z. Anal. Chem. 1978,292, 414.
L. N. Guseva,Aptech. Delo. 1963,12, 44 (Chem. Abstr. 1964,61, 11316d).
R. F. Falco, A. C. C. Cavaco,Rev. Port. Farm. 1966,16, 404 (Chem. Abstr. 1967,66, 98557x).
E. Szekely, A. Bandel, M. Flitman,Talanta 1972,19, 1429.
A. Izquierdo, E. Basch, V. Rodrigo,Talanta 1982,29, 1125.
H. Flaschka,Talanta 1961,8, 342.
C. N. Reilley, H. A. Flaschka, S. Laurent, B. Laurent,Anal. Chem. 1960,32, 1218.
V. M. Bhuchar, V. P. Kukreja, S. R. Das,Anal. Chem. 1971,43, 1847.
F. C. Breckenridge, W. R. Schaub,J. Opt. Soc. Am. 1939,29, 370.
C. I. E. Colorimetry Committee,J. Opt. Soc. Am. 1974,64, 896.
H. Pauli,J. Opt. Soc. Am. 1976,66, 866.
V. M. Buchar, A. K. Agarwal,Analyst 1982,107, 1439.
J. Barbosa, E. Bosch, Marti Roses,Analyst 1987,112, 179.
E. Bosch, Marti Roses,Talanta 1988,35, 419.
J. Barbosa, E. Bosch, Felix Suarez,Analyst 1985,110, 1473.
K. Richter,Color Res. Appl. 1980,5, 25.
J. Martinez Calatayud, M. C. Pascaul Marti, P. C. Falco,Anal. Chem. 1986,58, 200.
S. Kotrly, K. Vytras, J. Oharek, E. Vondruskova,Vyso. Skol. Chem. Technol., Pardubice 1970,I22, 19.
S. Kotrly, K. Vytras,Vyso. Skol. Chem. Technol., Pardubice 1970,I 19, 21.
K. Vytras, J. Vytrasova, S. Kotrly,Talanta 1975,22, 529.
J. Martinez Calatayud, M. C. Pascual Marti,Analusis 1984,12, 409.
J. Cacho, A. Garnica, C. Nerin,Anal Chim. Acta 1983,162, 113.
K. M. M. Krishna Prasad, S. Raheem,Talanta 1991,38, 793.
K. M. M. Krishna Prasad, S. Raheem,Analusis 1992,20, 401.
K. M. M. Krishna Prasad, S. Raheem,Mikrochim. Acta 1993,112, 63.
S. Raheem, K. M. M. Krishna Prasad,Talanta 1993,40, 1809.
K. M. M. Krishna Prasad, S. Raheem,Anal. Chim. Acta 1992,264, 137.
K. M. M. Krishna Prasad, P. Vijaya Lekshmi, C. Kamala Sastri,Analyst 1994,119, 2817.
C. N. Reilley, E. M. Smith,Anal. Chem. 1960,32, 1233.
L. I. Vogel,Vogels Text Book of Quantitative Inorganic Analysis, 3rd Ed., Longman, 1964, p. 322.
Pharmacopoeia of India, Vol. 2, 3rd Ed., Ministry of Health and Family Welfare (India), 1985, p. A233.
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Sastry, C.S.P., Srinivas, K.R., Rao, D.N. et al. Screening and specification of colour changes of nitritometric indicators. Mikrochim Acta 118, 51–61 (1995). https://doi.org/10.1007/BF01242227
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DOI: https://doi.org/10.1007/BF01242227