© by PSP Volume 26 ± No. 2a/ 2017 pages 1329-1332 Fresenius Environmental Bulletin 1 FEB - FRESENIUS ENVIRONMENTAL BULLETIN Founded jointly by F. Korte and F. Coulston Production by PSP - Vimy Str. 1e, 85354 Freising, Germany in cooperation with PRT-Parlar Research & Technology Vimy Str 1e, 85354 Freising Copyright© by PSP and PRT, Vimy Str. 1e, 85354 Freising, Germany All rights are reserved, especially the right to translate into foreign language or other processes - or convert to a machine language, especially for data processing equipment - without written permission of the publisher. The rights of reproduction by lecture, radio and television transmission, magnetic sound recording or similar means are also reserved. Printed in Germany-ISSN 1018-4619