The theory and practice of electrolytic methods of analysis / by Dr. Bernhard Neumann ; translated by John B.C. Kershaw, F.I.C.

  • Neumann, Bernhard, 1867-
Date:
1898
Catalogue details

Licence: Public Domain Mark

Credit: The theory and practice of electrolytic methods of analysis / by Dr. Bernhard Neumann ; translated by John B.C. Kershaw, F.I.C. Source: Wellcome Collection.

    10/278
    Three warnings may be given to those who through the instrumentality of this book ai’e led to make practical use of electrolytic methods in their laboratories for the first time : — 1. Electrolytic methods should only be used when decided advantages in time or accuracy will result. The practical examples given in Part III., D, clearly indicate the principles upon which electrolysis can be used with advantage in analytical work. The Author’s concluding paragraph on page 245 wisely states that it will ‘alwaysbe found most convenient to combine the chemical and electro- lytic methods of separation.’ The attempt to carry out complete analyses by means of electrolysis, or to use electrolytic methods for the determination of metals more conveniently estimated by gravimetric or volumetric methods of analysis, will generally result in failure, and may lead the chemist who has not had any experience of the advantages to be gained from these new methods, when rightly applied, to confine himself more rigidly than before to the older methods of analytical work. 2. The greatest care and attention must be given to the precautions, mentioned on page 85, relative to the elec- trodes. Many failures of electrolytic methods in the hands of students and novices could, no doubt, be traced to neglect of these very elementary conditions of successful work. 3. The conditions as to current density, temperature, and E.M.F. mentioned in the detailed descriptions of the various methods in Part III. must be strictly observed. Slight variations in these conditions will in many cases suffice to entirely alter the nature or character of the deposit. In conclusion, the Translator hopes that the reception accorded in England and America to the English edition of Dr. Neumann’s work may be as favourable as that given to the original in Germany one year ago. London : January 1898.