MODERN PRACTICE OF GAS CHROMATOGRAPHY .MODERN PRACTICE OF GAS CHROMATOGRAPHY FOURTH EDITION Edited by Robert L. Grob, . Professor Emeritus, Analytical Chemistry, Villanova University Eugene F. Barry, . Professor of Chemistry, University of Massachusetts Lowell A JOHN WILEY & SONS, INC. PUBLICATION .Copyright 2004 by John Wiley & Sons, Inc. All rights reserved. Published by John Wiley & Sons, Inc., Hoboken, New Jersey. Published simultaneously in Canada. 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, scanning, or otherwise, except as permitted under Section 107 or 108 of the 1976 United.