Determination of Lithium (Classic Reprint)

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Excerpt from Determination of Lithium In the examination of mineral waters for lithium there is need of a method by which small amounts of this substance may be deter mined with reasonable accuracy when only relatively small amounts (from 1 to 5 liters) of water are available for this determination in the general scheme of a complete mineral water analysis. Where the amount of lithium present is as small as mg per liter, the evaporation of a quantity of water large enough to give a weighable quantity of lithium salt consumes so much time and gives such large quantities of other salts that it seems better to use a small quantity of water and determine the lithium spectroscopically after it is sepa rated from the other constituents. I In such cases the separation from the other substances in the water is carried out according to the provisional method of the Association of Official Agricultural Chemists 1 first proposed by Gooch, 2 which is regularly used in the water laboratory of the Bureau of Chemistry when weighable quantities of lithium are present. The spectroscopic determination is made on a solution of the sulphates of lithium, sodium, and potassium obtained by the Gooch method of separation with amyl alcohol. A preliminary paper by one of the authors 3 read at the thirty-ninth annual meeting of the American Association for the Advancement of Science, at Baltimore, 1908, gave a brief outline and review of the work, making use of the Spectroscope in the quantitative determination of lithium and the effect of the masking of the red lithium line (lia) by various amounts of sodium and potassium. In this bulletin is given a review of methods which have been considered or tested for the separation of lithium and a method developed by the authors for the determination by the spectroscope of the small amount of lithium usually found in mineral waters and in some other substances. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.