Identification of brominated organic compounds in aquatic biota and exploration of bromine isotope analysis for source apportionment
Brominated organic compounds (BOCs) of both natural and anthropogenic origin are abundant in the environment. Most compounds are either clearly natural or clearly anthropogenic but some are of either mixed or uncertain origin. This thesis aims to identify some naturally produced BOCs and to develop...
Main Author: | |
---|---|
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
Published: |
Institutionen för material- och miljökemi (MMK)
2010
|
Subjects: | |
Online Access: | http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-38871 |
id |
ftstockholmuniv:oai:DiVA.org:su-38871 |
---|---|
record_format |
openpolar |
spelling |
ftstockholmuniv:oai:DiVA.org:su-38871 2023-05-15T16:36:27+02:00 Identification of brominated organic compounds in aquatic biota and exploration of bromine isotope analysis for source apportionment Unger, Maria 2010 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-38871 eng eng Institutionen för material- och miljökemi (MMK) Stockholm : Department of Materials and Environmental Chemistry (MMK), Stockholm University http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-38871 urn:isbn:978-91-7447-070-3 info:eu-repo/semantics/openAccess Polybrominated dibenzo-p-dioxins (PBDDs) NMR spectroscopy preparative capillary gas chromatography (PCGC) stable bromine isotope ratio GC-multiple collector- ICP-MS Environmental Sciences Miljövetenskap Doctoral thesis, comprehensive summary info:eu-repo/semantics/doctoralThesis text 2010 ftstockholmuniv 2023-02-23T21:42:28Z Brominated organic compounds (BOCs) of both natural and anthropogenic origin are abundant in the environment. Most compounds are either clearly natural or clearly anthropogenic but some are of either mixed or uncertain origin. This thesis aims to identify some naturally produced BOCs and to develop a method for analysis of the bromine isotopic composition in BOCs found in the environment. Polybrominated dibenzo-p-dioxins (PBDDs) in the Baltic Sea are believed to be of natural origin although their source is unknown. Since marine sponges are major producers of brominated natural products in tropical waters, BOCs were quantified in a sponge (Ephydatia fluviatilis) from the Baltic Sea (Paper I). The results showed that the sponge does not seem to be a major producer of PBDDs in the Baltic Sea. In this study, mixed brominated/chlorinated dibenzo-p-dioxins were however discovered for the first time in a background environment without an apparent anthropogenic source. The use of nuclear magnetic resonance spectroscopy (NMR) is unusual in analytical environmental chemistry due to its sample requirements. Preparative capillary gas chromatography was used to isolate a sufficient amount of an unidentified BOC from northern bottlenose whale (Hyperoodon ampullatus) blubber (Paper II) to enable NMR analysis for identification of the compound. The bromine isotopic composition of BOCs may give information on the origin and environmental fate of these compounds. The first steps in this process are the development of a method to determine the bromine isotope ratio in environmentally relevant BOCs (Paper III) and measuring the bromine isotope ratio of several standard substances to establish an anthropogenic endpoint (Paper IV). At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Manuscript. Paper 4: Manuscript. Doctoral or Postdoctoral Thesis hyperoodon ampullatus Northern bottlenose whale Stockholm University: Publications (DiVA) |
institution |
Open Polar |
collection |
Stockholm University: Publications (DiVA) |
op_collection_id |
ftstockholmuniv |
language |
English |
topic |
Polybrominated dibenzo-p-dioxins (PBDDs) NMR spectroscopy preparative capillary gas chromatography (PCGC) stable bromine isotope ratio GC-multiple collector- ICP-MS Environmental Sciences Miljövetenskap |
spellingShingle |
Polybrominated dibenzo-p-dioxins (PBDDs) NMR spectroscopy preparative capillary gas chromatography (PCGC) stable bromine isotope ratio GC-multiple collector- ICP-MS Environmental Sciences Miljövetenskap Unger, Maria Identification of brominated organic compounds in aquatic biota and exploration of bromine isotope analysis for source apportionment |
topic_facet |
Polybrominated dibenzo-p-dioxins (PBDDs) NMR spectroscopy preparative capillary gas chromatography (PCGC) stable bromine isotope ratio GC-multiple collector- ICP-MS Environmental Sciences Miljövetenskap |
description |
Brominated organic compounds (BOCs) of both natural and anthropogenic origin are abundant in the environment. Most compounds are either clearly natural or clearly anthropogenic but some are of either mixed or uncertain origin. This thesis aims to identify some naturally produced BOCs and to develop a method for analysis of the bromine isotopic composition in BOCs found in the environment. Polybrominated dibenzo-p-dioxins (PBDDs) in the Baltic Sea are believed to be of natural origin although their source is unknown. Since marine sponges are major producers of brominated natural products in tropical waters, BOCs were quantified in a sponge (Ephydatia fluviatilis) from the Baltic Sea (Paper I). The results showed that the sponge does not seem to be a major producer of PBDDs in the Baltic Sea. In this study, mixed brominated/chlorinated dibenzo-p-dioxins were however discovered for the first time in a background environment without an apparent anthropogenic source. The use of nuclear magnetic resonance spectroscopy (NMR) is unusual in analytical environmental chemistry due to its sample requirements. Preparative capillary gas chromatography was used to isolate a sufficient amount of an unidentified BOC from northern bottlenose whale (Hyperoodon ampullatus) blubber (Paper II) to enable NMR analysis for identification of the compound. The bromine isotopic composition of BOCs may give information on the origin and environmental fate of these compounds. The first steps in this process are the development of a method to determine the bromine isotope ratio in environmentally relevant BOCs (Paper III) and measuring the bromine isotope ratio of several standard substances to establish an anthropogenic endpoint (Paper IV). At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Manuscript. Paper 4: Manuscript. |
format |
Doctoral or Postdoctoral Thesis |
author |
Unger, Maria |
author_facet |
Unger, Maria |
author_sort |
Unger, Maria |
title |
Identification of brominated organic compounds in aquatic biota and exploration of bromine isotope analysis for source apportionment |
title_short |
Identification of brominated organic compounds in aquatic biota and exploration of bromine isotope analysis for source apportionment |
title_full |
Identification of brominated organic compounds in aquatic biota and exploration of bromine isotope analysis for source apportionment |
title_fullStr |
Identification of brominated organic compounds in aquatic biota and exploration of bromine isotope analysis for source apportionment |
title_full_unstemmed |
Identification of brominated organic compounds in aquatic biota and exploration of bromine isotope analysis for source apportionment |
title_sort |
identification of brominated organic compounds in aquatic biota and exploration of bromine isotope analysis for source apportionment |
publisher |
Institutionen för material- och miljökemi (MMK) |
publishDate |
2010 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-38871 |
genre |
hyperoodon ampullatus Northern bottlenose whale |
genre_facet |
hyperoodon ampullatus Northern bottlenose whale |
op_relation |
http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-38871 urn:isbn:978-91-7447-070-3 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766026792409235456 |