Electronic Resource
Springer
Aquatic ecology
27 (1993), S. 51-58
ISSN:
1573-5125
Keywords:
river
;
sediment
;
chloroform
;
mineralization
;
anaerobic
;
reductive dechlorination
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The formation of14CO2 from 3 μg l−1 labelled chloroform was studied in anaerobic Dutch river sediments. All incubations were performed under anaerobic conditions. The observed first order mineralization kinetics showed half-lives of 2–37 days at 20°C in 12 muddy sediments. In contrast most of the sandy sediment samples did not show a mineralization of chloroform. Most probable number analysis revealed about 3.104 chloroform mineralizing bacteria per g of dry sediment in a muddy sediment and 1–2.103 chloroform mineralizing bacteria per g of dry sediment in a sandy sediment. Therefore the persistence of chloroform in sandy sediments is not caused by the absence of chloroform mineralizing bacteria but by the inactivity of these bacteria. This inactivity of the sandy sediments might allow chloroform from infiltrating river water to reach the groundwater. Mud samples from a relatively unpolluted site showed a similar chloroform mineralization rate compared with the polluted sediments from the rivers Rhine and Meuse. The data indicate that the reductive dechlorination of aliphatic compounds is not influenced at the polluted sites.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02336928
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