The use of MSSV pyrolysis to assist the molecular characterisation of aquatic natural organic matter
Microscale sealed vessel pyrolysis (MSSVpy) with online gas chromatography mass spectrometry (GC-MS) was used with several other established and complementary analytical methods to robustly characterize the structure of aquatic natural organic matter (NOM) and to practically assess the analytical va...
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| Format: | Journal Article |
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Elsevier Science Ltd
2010
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| Online Access: | http://hdl.handle.net/20.500.11937/20580 |
| _version_ | 1848750345463791616 |
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| author | Berwick, Lyndon Greenwood, Paul Smernik, R. |
| author_facet | Berwick, Lyndon Greenwood, Paul Smernik, R. |
| author_sort | Berwick, Lyndon |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Microscale sealed vessel pyrolysis (MSSVpy) with online gas chromatography mass spectrometry (GC-MS) was used with several other established and complementary analytical methods to robustly characterize the structure of aquatic natural organic matter (NOM) and to practically assess the analytical value of MSSVpy. The NOM used in the study was from North Pine (NP) reservoir, which is one of the major source waters supplying Brisbane, the capital city of the Australian state of Queensland. The reservoir has moderate dissolved organic carbon (DOC; 5 mg L-1) levels and is impacted by algae which periodically occur in bloom proportions. The hydrophobic (HPO; 65% initial DOG) and transphilic (TPI; 12%) fractions showed H/C values <1, low UVabs and low aryl-C measured by NMR which are all indicative of low aromaticity. MSSVpy produced distinctly higher product concentrations than traditional flash pyrolysis and the molecular profile of the HPO and TPI fractions revealed by MSSVpy was correlated with the other analytical data to help establish their structural relevance.Prolific distributions of alkyl substituted aromatic (e.g., benzenes, naphthalenes) and hydroaromatic (e.g., tetralins) products detected in the HPO fraction were attributed to the aromatisation of terpanes and other aliphatic compounds from algal, and possibly also plant sources. Alkyl phenols also detected in HPO in high abundance, are probably from algal biopolymers, but may also reflect a contribution from non-methoxylated lignin units of catchment grasses. There was no analytical evidence of the dihydroxy or methoxy aromatic structures typical of wood lignin or tannin. N-organic pyrolysates (e.g., alkyl pyrroles, pyridines, indoles) of diagenetically altered proteins were concentrated in the TPI fraction. The quantitative importance of the N-organic moiety of the TPI fraction was corroborated by a low C/N ratio and distinctive amide and amine signals detected by C-13 NMR and FTIR. This integrated study demonstrates that the qualitative speciation provided by MSSVpy can make a significant contribution to the structural characterisation and source recognition of aquatic NOM |
| first_indexed | 2025-11-14T07:35:21Z |
| format | Journal Article |
| id | curtin-20.500.11937-20580 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:35:21Z |
| publishDate | 2010 |
| publisher | Elsevier Science Ltd |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-205802017-09-13T16:03:34Z The use of MSSV pyrolysis to assist the molecular characterisation of aquatic natural organic matter Berwick, Lyndon Greenwood, Paul Smernik, R. Pyrolysis MSSV C-13 NMR Characterisation NOM FTIR Analytical Microscale sealed vessel pyrolysis (MSSVpy) with online gas chromatography mass spectrometry (GC-MS) was used with several other established and complementary analytical methods to robustly characterize the structure of aquatic natural organic matter (NOM) and to practically assess the analytical value of MSSVpy. The NOM used in the study was from North Pine (NP) reservoir, which is one of the major source waters supplying Brisbane, the capital city of the Australian state of Queensland. The reservoir has moderate dissolved organic carbon (DOC; 5 mg L-1) levels and is impacted by algae which periodically occur in bloom proportions. The hydrophobic (HPO; 65% initial DOG) and transphilic (TPI; 12%) fractions showed H/C values <1, low UVabs and low aryl-C measured by NMR which are all indicative of low aromaticity. MSSVpy produced distinctly higher product concentrations than traditional flash pyrolysis and the molecular profile of the HPO and TPI fractions revealed by MSSVpy was correlated with the other analytical data to help establish their structural relevance.Prolific distributions of alkyl substituted aromatic (e.g., benzenes, naphthalenes) and hydroaromatic (e.g., tetralins) products detected in the HPO fraction were attributed to the aromatisation of terpanes and other aliphatic compounds from algal, and possibly also plant sources. Alkyl phenols also detected in HPO in high abundance, are probably from algal biopolymers, but may also reflect a contribution from non-methoxylated lignin units of catchment grasses. There was no analytical evidence of the dihydroxy or methoxy aromatic structures typical of wood lignin or tannin. N-organic pyrolysates (e.g., alkyl pyrroles, pyridines, indoles) of diagenetically altered proteins were concentrated in the TPI fraction. The quantitative importance of the N-organic moiety of the TPI fraction was corroborated by a low C/N ratio and distinctive amide and amine signals detected by C-13 NMR and FTIR. This integrated study demonstrates that the qualitative speciation provided by MSSVpy can make a significant contribution to the structural characterisation and source recognition of aquatic NOM 2010 Journal Article http://hdl.handle.net/20.500.11937/20580 10.1016/j.watres.2010.02.023 Elsevier Science Ltd restricted |
| spellingShingle | Pyrolysis MSSV C-13 NMR Characterisation NOM FTIR Analytical Berwick, Lyndon Greenwood, Paul Smernik, R. The use of MSSV pyrolysis to assist the molecular characterisation of aquatic natural organic matter |
| title | The use of MSSV pyrolysis to assist the molecular characterisation of aquatic natural organic matter |
| title_full | The use of MSSV pyrolysis to assist the molecular characterisation of aquatic natural organic matter |
| title_fullStr | The use of MSSV pyrolysis to assist the molecular characterisation of aquatic natural organic matter |
| title_full_unstemmed | The use of MSSV pyrolysis to assist the molecular characterisation of aquatic natural organic matter |
| title_short | The use of MSSV pyrolysis to assist the molecular characterisation of aquatic natural organic matter |
| title_sort | use of mssv pyrolysis to assist the molecular characterisation of aquatic natural organic matter |
| topic | Pyrolysis MSSV C-13 NMR Characterisation NOM FTIR Analytical |
| url | http://hdl.handle.net/20.500.11937/20580 |