Bonner

The element was first prepared by Klemm and bonner in 1937 by reducing ytterbium trichloride with potassium. Their metal was mixed, however, with KCl. Daane, Dennison, and Spedding prepared a much purer from in 1953 from which the chemical and physical properties of the element could be determined. 

Klaus R. Undner Daniel P. Bonner William H. Koster... 

D. Kuron, Wasserstoff und Korrosion, Bonner Studien-Reihe, Band 3, Verlag 1. Kuron, Bonn 1986. 

Bonner, W. A., et al Prevention of Hydrogen Attack on Steel in Refinery Equipment," paper presented at API Div. of Refining 18th Mid-year Meeting, May 1953. 

Over the years with the different editions 1 have received help from very many companies concerned with the production of plastics materials and from very many individuals. For this edition I should specifically like to thank Susan Davey, Academic Information Services Manager of the University of North London, Rebecca Dolbey and Ray Gill of Rapra Technology Ltd, Peter Lewis of the Open University, Simon Robinson of European Plastics News, Christopher Sutcliffe of Crystal Polymers Ltd and Graham Bonner of BP Chemicals. 

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