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This book deals with ring oven techniques which although originally developed as a qualitative separation technique for extremely minute samples, has now found wide applications in different branches of analytical chemistry. In qualitative or quantitative analysis, separation of the substances contained in the sample into one or more groups is one of the most important steps. The separation steps must be selected in such a way that the substances which are collected together in one group do not interfere with the subsequent identification or determination of each substance in the group. The successful application of the ring oven technique under such conditions is fully described in this volume
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MICROANALYSIS BY THE RING-OVEN TECHNIQUE by Dr. HERBERT WEISZ Professor of Analytical Chemistry, University of Freiburg, German Federal Republic Second enlarged and revised edition Foreword by Professor Fritz Feigl P E R G A M O N PRESS Oxford · New York · Toronto · Sydney · Braunschweig Pergamon Press Ltd., Headington Hill Hall, Oxford Pergamon Press Inc., Maxwell House, Fairview Park, Elmsford, New York 10523 Pergamon of Canada Ltd., 207 Queen's Quay West, Toronto 1 Pergamon Press (Aust.) Pty. Ltd., 19a Boundary Street, Rushcutters Bay, N.S.W. 2011, Australia Vieweg & Sohn GmbH, Burgplatz 1, Braunschweig Copyright © 1970 Pergamon Press Ltd. All Rights Reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior permission of Pergamon Press Ltd. First edition 1961 Second edition 1970 Library of Congress Catalog Card No. 72-107940 Printed in Great Britain by A. Wheaton & Co., Exeter 08 015702 5 Foreword WHEN I visited the famous Institute for Analytical Chemistry at the Technische Hochschule in Vienna for the first time after World War II, I learned of the original approaches of Dr. Herbert Weisz to the problems of spot test analysis and the chemistry of specific, selective and sensitive reactions. During my next visit, Dr. Weisz demonstrated to me his first simple model of the ring oven. I recognized immediately that the ring oven technique would fill an important gap in the exploration of spot tests. During the subsequent years, Dr. Weisz indefatigably pursued a programme of research with the ring oven and published many interesting papers on the subject. The ring oven method which Dr. Weisz created is now recognized all over the world and is used in many fields of analytical chemistry. The potential uses of this method in qualitative and semi-quantitative analysis, radiochemistry, paper chromatography etc. are most promising. The present state of the ring oven technique demanded the preparation of a monograph on this subject. It is therefore with much personal pleasure that I recommend this first monograph on the ring oven which in my opinion represents an important milestone in spot test analysis. Rio de Janeiro vu Preface to the second edition THE first edition of this monograph appeared in 1961. The list of references dealing with this then rather newly developed technique of microanalysis contained twenty-six publications. Now, eight years later, there are about two hundred publications about the ring oven method to be found in the literature. This justifies, I hope, the preparation of a new edition of this book. Some chapters had to be newly written, some needed only minor changes ; for instance, the first ones describing the basics of the technique. I should like to draw the attention of the reader to the chapters on the uses in the field of analysis of organic substances and of radioactive substances. The last two chapters of the present monograph on "Combination with other techniques" an