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Barbosa J, Bosch E, Carrera R. A comparative study of some hydroxyanthraquinones as acid-base indicators. Talanta. 1985;32(11):1077-81doi: 10.1016/0039-9140(85)80129-6.
Barbosa, J., Bosch, E., & Carrera, R. (1985). A comparative study of some hydroxyanthraquinones as acid-base indicators. Talanta, 32(11), 1077-81. https://doi.org/10.1016/0039-9140(85)80129-6
Barbosa, J, et al. "A comparative study of some hydroxyanthraquinones as acid-base indicators." Talanta vol. 32,11 (1985): 1077-81. doi: https://doi.org/10.1016/0039-9140(85)80129-6
Barbosa J, Bosch E, Carrera R. A comparative study of some hydroxyanthraquinones as acid-base indicators. Talanta. 1985 Nov;32(11):1077-81. doi: 10.1016/0039-9140(85)80129-6. PMID: 18963955.
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Talanta. 1985 Nov;32(11):1077-81. doi: 10.1016/0039-9140(85)80129-6.

A comparative study of some hydroxyanthraquinones as acid-base indicators.

Talanta

J Barbosa, E Bosch, R Carrera

Affiliations

  1. Department of Analytical Chemistry, University of Barcelona, Barcelona, Spain.

PMID: 18963955 DOI: 10.1016/0039-9140(85)80129-6

Abstract

Alizarin, Alizarin S, quinizarin and quinalizarin have been compared as acid-base indicators with Bromocresol Green and Methyl Orange as reference indicators. The chromaticity co-ordinates, complementary chromaticity co-ordinates, pK(a) values, transition pH-range, pH of maximum colour change, optimum concentration for titrations and the quality of colour change were determined. The results show all four to be good indicators with a colour change quality similar to that of Bromocresol Green.

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