Abstract
DR. VIERORDT has been endeavouring to found a quantitative spectrum analysis for bodies giving an absorption spectrum. His method consists in the use of a slit divided horizontally into two parts; one of these, is adjusted to a certain width; the solution whose absorption is to be examined is placed opposite this, and in front of the other half is placed another solution of the same body but of a different strength, and the slit is then narrowed or widened as the solution is stronger or weaker until the absorption is the same in both halves of the spectrum. The width of the latter slit is then read off. By using a number of solutions of strengths varying decimally from the weakest possible to the strongest through which light will pass, curves are obtained and a solution of unknown strength can then be interpolated in the curve and its value ascertained. The solutions to be examined are, of of course, kept at a constant thickness. As the relation between the concentration of the solution and its coefficient of the absorption of light only remains constant within certain limits, solutions of the necessary dilution have to be employed and unknown solutions must be diluted to this point: the value is then found by calculation.
Die Anwendung Des Spectralapparate von Dr. K. Vierordt.
(Tübingen: H. Laupp, 1873.)
Article PDF
Rights and permissions
About this article
Cite this article
Die Anwendung Des Spectralapparate von Dr. K. Vierordt . Nature 7, 401 (1873). https://doi.org/10.1038/007401a0
Issue Date:
DOI: https://doi.org/10.1038/007401a0