Pentachlorophenol: Uptake/elimination kinetics and metabolism in an aquatic plant, Eichhornia crassipes
- Univ. of Kuopio (Finland). Dept. of Physiology
Eichhornia crassipes [(Mart) Solms], an aquatic plant widely used for the treatment of wastewaters, was used to study uptake/elimination kinetics and metabolism of pentachlorophenol (PCP). PCP is a well-known industrial by-product and a major pollutant of the aquatic environment. The initial phase of PCP uptake by the plant was rapid and reached a nearly steady state between 24 and 48 h of exposure to PCP. The major by-products of PCP metabolisms in Eichhornia crassipes were identified as ortho- and para- substituted chlorohydroxyphenols (chlorocatechols and -hydroquiones), -anisoles, and -veratroles. Partially dechlorinated products of PCP were also detected. A major portion of the absorbed PCP and metabolites was found in bound/conjugated form. The response of the enzyme systems involved in the xenobiotic metabolism and antioxidative system were also studied following PCP exposure. A significant increase was observed in the activity of glutathione S-transferase (GST), a major conjugating enzyme, and in the activities of superoxide dismutase and ascorbate peroxidase of PCP exposed plants. Such responses of plant enzymes may be implemented as useful markers of aquatic pollution. The result related to the uptake and metabolism of PCP obtained from the present study suggests a crucial role of aquatic plants in determining the fate of environmental chemicals.
- OSTI ID:
- 7269045
- Journal Information:
- Environmental Toxicology and Chemistry; (United States), Vol. 13:5; ISSN 0730-7268
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AQUATIC ORGANISMS
PLANT GROWTH
CHLORINATED AROMATIC HYDROCARBONS
BIODEGRADATION
WASTE WATER
WATER TREATMENT
WATER POLLUTION
BIOLOGICAL INDICATORS
AROMATICS
CHEMICAL REACTIONS
DECOMPOSITION
GROWTH
HALOGENATED AROMATIC HYDROCARBONS
HYDROGEN COMPOUNDS
LIQUID WASTES
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXYGEN COMPOUNDS
POLLUTION
WASTES
WATER
320305* - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management
540320 - Environment
Aquatic- Chemicals Monitoring & Transport- (1990-)
560300 - Chemicals Metabolism & Toxicology