Micro determination of calcium

Micro determination of calcium


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ABSTRACT I AM grateful to Dr. G. J. van Kolmeschate, of the Analytical Institute, Delft, and to Drs. H. A. Flaschka and A. J. Barnard, jun., of the Georgia Institute of Technology, and the


Baker Chemical Co., New Jersey, respectively, for directing my attention to the fact that the indicator used by me1 for the micro-determination of calcium is Eriochrome Black _T_, and


therefore well known in this connexion. For this I express my regret: the error was due in part to discrepancies in the literature. However, although the use of this indicator is evidently


not novel, my results show that it is possible to use it at _p_H 12–13, where other workers have found it unsatisfactory; I have therefore found it possible to determine calcium directly in


the presence of magnesium. Possibly my ability to obtain a satisfactory end-point is due partly to carrying out the titration in essentially a thin film, and partly to using a high


concentration of indicator—5λ of a 0.4 per cent methanol solution, or about 40 times the concentration used by Hildebrand and Reilly with ‘Calcon’2. In this respect I find Eriochrome Black


_T_ to be superior to the latter indicator at such micro-levels. With the very small volumes involved, the coloration of ‘Calcon’ is undetectable at the recommended concentration: and using


this indicator sufficiently concentrated to produce a visible coloration leads to gross inaccuracies which the use of blank determinations cannot correct at the calcium-levels it is desired


to estimate. On the other hand, the high concentration of Eriochrome Black _T_ required to give a detectable colour apparently does not affect the accuracy of the results. Access through


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CALIBRATION METHOD FOR ELECTRON PROBE MICROANALYSIS (EPMA) OF INDIUM IN SPHALERITE (ZNS) Article Open access 06 March 2025 REFERENCES * Gilbert, A. B., _Nature_, 183, 888 (1959). Article 


ADS  CAS  Google Scholar  * Hildebrand, G. P., and Reilly, C. N., _Anal. Chem._, 29, 253 (1957). Article  Google Scholar  Download references AUTHOR INFORMATION AUTHORS AND AFFILIATIONS *


Department of Zoology, King's College (University of Durham), Newcastle upon Tyne A. B. GILBERT Authors * A. B. GILBERT View author publications You can also search for this author


inPubMed Google Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE GILBERT, A. Micro Determination of Calcium. _Nature_ 183, 1754–1755 (1959).


https://doi.org/10.1038/1831754b0 Download citation * Issue Date: 20 June 1959 * DOI: https://doi.org/10.1038/1831754b0 SHARE THIS ARTICLE Anyone you share the following link with will be


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