Photometric, colorimetric, and acid-base characteristics of nitroso-R-salt

Autor:	V. N. Figurovskaya, Chin’ Tkhi Tuet Mai, V. M. Ivanov, Yu. A. Barbalat, N. I. Ershova, A. M. Mamedova
Rok vydání:	2006
Předmět:	chemistry.chemical_classification Aqueous solution Base (chemistry) medicine.diagnostic_test Inorganic chemistry Analytical chemistry Nitroso-R-salt Analytical Chemistry Dissociation constant chemistry Ionic strength Reagent Spectrophotometry medicine Colorimetry
Zdroj:	Journal of Analytical Chemistry. 61:571-575
ISSN:	1608-3199 1061-9348
DOI:	10.1134/s1061934806060104
Popis:	Optical and colorimetric characteristics of 1-nitroso-2-naphthol-3,6-disulfonic acid (nitroso-R-salt) are studied in aqueous solutions at pH 4–10. Equations of calibration plots are obtained as the colorimetric functions of the concentration, and the molar coefficients of the colorimetric functions are calculated. The dissociation constants of nitroso-R-salt are determined by colorimetry at an ionic strength of 0.1–0.5, reduced to zero ionic strength, and compared with the literature data. Advantages of colorimetry over spectrophotometry in the determination of the dissociation constants of colored reagents are demonstrated.
Databáze:	OpenAIRE
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