Cobalt, Nickel, and the Elements of the Platinum Group (Classic Reprint) - Hardcover

Friend, J. Newton

9780332070612: Cobalt, Nickel, and the Elements of the Platinum Group (Classic Reprint)

Hardcover

ISBN 10: 0332070611 ISBN 13: 9780332070612

Verlag: Forgotten Books, 2018

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Excerpt from Cobalt, Nickel, and the Elements of the Platinum Group

Again, the platinum metals are so closely similar in many of their properties that it was decided to treat of their detection and estimation all together in Chapter X, rather than to deal with each separately at the end of the chapters dealing with their compounds, as has been done with cobalt and nickel, and, indeed, with the elements in the remaining volumes.

The state of our knowledge of the chemistry of the platinum metals, although greatly improved during the last twenty years, is still far from satisfactory. This, no doubt, is due to a variety of reasons, such as the rarity of the metals, their consequently high cost, apd their similarity to one another, which renders their preparation in a state of purity an extremely arduous task. This latter feature is well exemplified by the efforts of Matthey to prepare pure iridium. His work is described in fair detail on pp. 235 - 236 of the text. Even after a most elaborate treatment the metal still contained traces of ruthenium and rhodium.

In consequence of this difficulty, there can be no doubt that the early investigators frequently worked with a very impure metal, and this may in some measure account for discrepancies and apparent contradictions in their results.

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