Factors affecting the occurrence, isomer ratio and enantioselective degradation of hexachlorocyclohexane in arctic and temperate aquatic systems

grantor: University of Toronto An investigation to determine factors affecting the biodegradative losses of HCHs in arctic, subarctic and temperate aquatic systems was performed. Concentrations of Ã- and ã-HCH were highest in large and cold lakes and lowest in warmer temperate lakes. The Ã-HCH/ã-HCH...

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Main Author: Law, Sheryl A.
Format: Thesis
Language:English
Published: 2000
Subjects:
Arctic
Subarctic
Online Access:http://hdl.handle.net/1807/13930
http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0022/MQ50398.pdf
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spelling ftunivtoronto:oai:localhost:1807/13930 2023-05-15T14:49:41+02:00 Factors affecting the occurrence, isomer ratio and enantioselective degradation of hexachlorocyclohexane in arctic and temperate aquatic systems Law, Sheryl A. 2000 5616430 bytes application/pdf http://hdl.handle.net/1807/13930 http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0022/MQ50398.pdf en en_US eng http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0022/MQ50398.pdf http://hdl.handle.net/1807/13930 Thesis 2000 ftunivtoronto 2020-06-17T11:12:00Z grantor: University of Toronto An investigation to determine factors affecting the biodegradative losses of HCHs in arctic, subarctic and temperate aquatic systems was performed. Concentrations of Ã- and ã-HCH were highest in large and cold lakes and lowest in warmer temperate lakes. The Ã-HCH/ã-HCH ratio was highest in arctic/subarctic lakes, indicating long range transport and the low ratios in small temperate systems are due to fresh ã-HCH. The enantiomer ratio (ER), was lowest in lakes with high concentrations of Ã-HCH, in cold and/or oligotrophic lakes with long residence times. ERs were highest in small temperate lakes with low Ã-HCH concentrations. These factors are significantly related to the contact between Ã-HCH and oligotrophic microbes. Enantioselective degradation was also greatest in wetlands and northern streams due to contact with the biofilm. Microcosms were unable to isolate factors enhancing enantioselective degradation of Ã-HCH due to the inability to mimic the conditions for the degrading microbes. M.Sc. Thesis Arctic Subarctic University of Toronto: Research Repository T-Space Arctic
institution Open Polar
collection University of Toronto: Research Repository T-Space
op_collection_id ftunivtoronto
language English
description grantor: University of Toronto An investigation to determine factors affecting the biodegradative losses of HCHs in arctic, subarctic and temperate aquatic systems was performed. Concentrations of Ã- and ã-HCH were highest in large and cold lakes and lowest in warmer temperate lakes. The Ã-HCH/ã-HCH ratio was highest in arctic/subarctic lakes, indicating long range transport and the low ratios in small temperate systems are due to fresh ã-HCH. The enantiomer ratio (ER), was lowest in lakes with high concentrations of Ã-HCH, in cold and/or oligotrophic lakes with long residence times. ERs were highest in small temperate lakes with low Ã-HCH concentrations. These factors are significantly related to the contact between Ã-HCH and oligotrophic microbes. Enantioselective degradation was also greatest in wetlands and northern streams due to contact with the biofilm. Microcosms were unable to isolate factors enhancing enantioselective degradation of Ã-HCH due to the inability to mimic the conditions for the degrading microbes. M.Sc.
format Thesis
author Law, Sheryl A.
spellingShingle Law, Sheryl A.
Factors affecting the occurrence, isomer ratio and enantioselective degradation of hexachlorocyclohexane in arctic and temperate aquatic systems
author_facet Law, Sheryl A.
author_sort Law, Sheryl A.
title Factors affecting the occurrence, isomer ratio and enantioselective degradation of hexachlorocyclohexane in arctic and temperate aquatic systems
title_short Factors affecting the occurrence, isomer ratio and enantioselective degradation of hexachlorocyclohexane in arctic and temperate aquatic systems
title_full Factors affecting the occurrence, isomer ratio and enantioselective degradation of hexachlorocyclohexane in arctic and temperate aquatic systems
title_fullStr Factors affecting the occurrence, isomer ratio and enantioselective degradation of hexachlorocyclohexane in arctic and temperate aquatic systems
title_full_unstemmed Factors affecting the occurrence, isomer ratio and enantioselective degradation of hexachlorocyclohexane in arctic and temperate aquatic systems
title_sort factors affecting the occurrence, isomer ratio and enantioselective degradation of hexachlorocyclohexane in arctic and temperate aquatic systems
publishDate 2000
url http://hdl.handle.net/1807/13930
http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0022/MQ50398.pdf
geographic Arctic
geographic_facet Arctic
genre Arctic
Subarctic
genre_facet Arctic
Subarctic
op_relation http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0022/MQ50398.pdf
http://hdl.handle.net/1807/13930
_version_ 1766320766127702016

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