caa a22 4500 465825540 CHVBK 20180323112148.0 cr unu---uuuuu 170327e19900701xx s 000 0 eng 10.1007/BF02256745 doi (NATIONALLICENCE)springer-10.1007/BF02256745 The kinetics of the degradation of chloroform and benzene in anaerobic sediment from the River Rhine [Elektronische Daten] [P. Van Beelen, F. Van Keulen] In anaerobic methanogenic sediment microcosms14C labelled chloroform was degraded mainly to carbon dioxide. At a concentration of 4 μg.l−1 the mineralization followed first order kinetics with a half life of 12 days at 10°C and 2.6 days at 20°C. At a concentration of 400 μg.l−1 the mineralization rate increased with time and followed logarithmic kinetics with a μmax of 0.02.d−1 at 10°C. The logarithmic kinetics can be explained by growth of the bacteria on the higher concentration of chloroform with a generation time of 35 days. Shaking and oxygenation did not inhibit the mineralization of chloroform, probably because of bacterial consumption of the dissolved oxygen. 14C labelled benzene was mineralized only for a small percentage to14C labelled carbon dioxide while other, not acid extractable, degradation products were formed. Under anaerobic conditions after one day when 5% of the benzene was degraded to carbon dioxide, the mineralization ceased, while the disappearance of benzene proceeded. With air in the headspace of the incubation bottles 25% of the benzene was mineralized to carbon dioxide. The anaerobic degradation of benzene at a concentration of 100 μ.l−1 showed similar kinetics as the degradation at 1 μg.l−1. Hence no adaptation of the microflora in the sediment occurred during the 63 days of the experiment at 100 μg.l−1. Netherlands Hydrobiological Society, 1990 Biodegradation nationallicence chloroform nationallicence benzene nationallicence sediment nationallicence kinetics nationallicence Van Beelen P. National Institute of Public Health and Environmental Protection, P.O. Box 1, 3720 BA, Bilthoven, The Netherlands aut Van Keulen F. National Institute of Public Health and Environmental Protection, P.O. Box 1, 3720 BA, Bilthoven, The Netherlands aut Hydrobiological Bulletin Kluwer Academic Publishers 24/1(1990-07-01), 13-21 0165-1404 24:1<13 1990 24 10452 https://doi.org/10.1007/BF02256745 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02256745 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Van Beelen P. National Institute of Public Health and Environmental Protection, P.O. Box 1, 3720 BA, Bilthoven, The Netherlands aut NATIONALLICENCE 700 1- Van Keulen F. National Institute of Public Health and Environmental Protection, P.O. Box 1, 3720 BA, Bilthoven, The Netherlands aut NATIONALLICENCE 773 0- Hydrobiological Bulletin Kluwer Academic Publishers 24/1(1990-07-01), 13-21 0165-1404 24:1<13 1990 24 10452 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer