Summary
Disodium salt of o-carboxyphenylazo chromotropic acid (chromotrope 2C) has been used for the colorimetric determination of microamounts of beryllium and zirconium. The red-violet complexes show maximum absorption at 580 nm and the colour systems obey Beer's law from 0.025 to 0.375 ppm of beryllium and 2 to 12 ppm of zirconium. The optimum concentration ranges are from 0.125 to 0.375 ppm for beryllium and from 4 to 12 ppm for zirconium, where the percent relative errors per 1% absolute photometric error are, respectively, 3.014 and 3.22. The sensitivity of the reactions per cm2 are 0.00067 μg Be and 0.027 μg Zr. The complexes, with the metal to reagent ratio of 1∶1, have instability constants as 2.836 · 10−6 for beryllium and 6.026 · 10−6 for zirconium.
Similar content being viewed by others
References
Job, P.: C.R. Acad. Sci. 180, 928 (1925); Ann. Chimie 9, 113 (1928).
Majumdar, A. K., and C. P. Savariar: Anal. chim. Acta (Amsterdam) 21, 47 (1959); cf. Z. analyt. Chem. 174, 153 (1960).
Majumdar, A. K., and C. P. Savariar: Z. analyt. Chem. 174, 197, 269 (1960).
Ringbom, A.: Z. analyt. Chem. 115, 332 (1938/39).
Sandell, E. B.: Colorimetric Determination of Traces of Metals, Intersci. Publ. Inc., New York 1950, p. 50.
Vosburgh, W. C., and G. R. Cooper: J. Amer. chem. Soc. 63, 437 (1941).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Majumdar, A.K., Savariar, C.P. Spectrophotometric determination of beryllium and zirconium using chromotrope-2C. Z. Anal. Chem. 176, 170–174 (1960). https://doi.org/10.1007/BF00449325
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00449325