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Kinetics of biphenyl and polychlorinated biphenyl metabolism in soil

Journal Article · · Appl. Environ. Microbiol.; (United States)
OSTI ID:5576044
;
The metabolism of /sup 14/C-labeled PCBs (polychlorinated biphenyls), which comprised the Aroclor 1242 mixture, was greatly enhanced by the addition of biphenyl (BP) to soil. After 49 days, only 25 to 35% of the original PCBs remained in the soil, and 48 to 49% was converted to /sup 14/CO/sub 2/ (including soil carbonates) in treatment enriched with BP; by contrast, 92% of the PCBs remained and less than 2% was converted to /sup 14/CO/sub 2/ in the unenriched control. Although the mineralization of PCBs in soils inoculated with Acinetobacter strain P6 was not greater than that in uninoculated BP-enriched soils, the initial and maximum mineralization rates and mineralization of BP was consistent with kinetic models based upon linear-no growth and exponential growth; lower cell densities (< 10/sup 6//g) of BP-oxidizing bacteria gave a better fit for exponential growth, whereas the highest cell density (10/sup 9//g) gave a better fit for linear-no growth. The numbers of BP-oxidizing bacteria declined exponentially upon depletion of the substrate. Since the mineralization of the chlorinated cometabolites was brought about by microorganisms (comensals) other than BP oxidizers, /sup 14/CO/sub 2/ production could not be fit to either of the two growth models. However, /sup 14/CO/sub 2/ production from the highest-density inoculum could be fit to a first-order (no-growth) sequential-reaction series.
Research Organization:
Univ. of California, Riverside
OSTI ID:
5576044
Journal Information:
Appl. Environ. Microbiol.; (United States), Journal Name: Appl. Environ. Microbiol.; (United States) Vol. 50:4; ISSN AEMID
Country of Publication:
United States
Language:
English

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Related Subjects

510200 -- Environment
Terrestrial-- Chemicals Monitoring &amp; Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
560302* -- Chemicals Metabolism &amp; Toxicology-- Microorganisms-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AROMATICS
BACTERIA
BIOCHEMICAL REACTION KINETICS
CHLORINATED AROMATIC HYDROCARBONS
HALOGENATED AROMATIC HYDROCARBONS
KINETICS
METABOLISM
MICROORGANISMS
MINERALIZATION
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
REACTION KINETICS
SOILS