Controls on the sulfur cycle in estuarine sediments on the Central Texas coast
The sedimentary sulfur cycle is one of the main components of estuarine biogeochemical systems. It is initiated by the oxidation of organic matter via sulfate reducing bacteria which produce hydrogen sulfide (H2S). The S(II) then reacts via both abiotic and biotic pathways to form sulfur with other...
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fttexasamuniv:oai:oaktrust.library.tamu.edu:1969.1/ETD-TAMU-1834 2023-07-16T03:57:35+02:00 Controls on the sulfur cycle in estuarine sediments on the Central Texas coast Thomson, Heather Morse, John W. Cifuentes, Luis McGuire, Jennifer 2009-06-02 electronic application/pdf born digital https://hdl.handle.net/1969.1/ETD-TAMU-1834 en_US eng https://hdl.handle.net/1969.1/ETD-TAMU-1834 sulfur cycle TRS AVS estuary Book Thesis Electronic Thesis text 2009 fttexasamuniv 2023-06-27T22:30:42Z The sedimentary sulfur cycle is one of the main components of estuarine biogeochemical systems. It is initiated by the oxidation of organic matter via sulfate reducing bacteria which produce hydrogen sulfide (H2S). The S(II) then reacts via both abiotic and biotic pathways to form sulfur with other oxidation states. The three most widely-studied “operationally”–defined components of the sedimentary sulfur system are total reduced (inorganic) sulfur (TRS), acid volatile sulfide (AVS), and dissolved (=filter-passing) sulfide. This study focused on several parameters that are widely held to be important in determining TRS in sediments and the relative proportions of TRS, AVS and dissolved S(II) forms. The formation of iron sulfide minerals requires metabolizable organic matter and SO4 2- to produce S(II) and “reactive”-Fe as a source for the iron in iron sulfide minerals. One of these components is generally the limiting factor in TRS formation (e.g., Berner 1970). Nine different sites from three locations on the Central Texas coast were studied for a variety of parameters including organic matter, sulfate concentrations, sulfate reduction rate, solid “reactive” and dissolved iron, and grain size, as well as TRS, AVS, and ΣH2S. At each site five sediment cores were taken to a depth of 20 cm whenever possible. The cores were sectioned in 2 cm intervals. The porewater was extracted and both solid and dissolved components were analyzed using a variety of methods, including carbon and sulfur coulometry, acid extraction, chromium extraction, and drying the sediment. The results of he analyses showed that the central Texas coast is a widely diverse system. Some sites were very sandy while others were fine-grained. This variety was especially true for the Nueces Bay and Baffin Bay sites. The East Matagorda Bay sites showed more homogeneity in almost all analysis. While the heterogeneity of locations along the Central Texas coast makes it difficult to make a definitive statement about the controls on TRS in this area, most ... Book Baffin Bay Texas A&M University Digital Repository Baffin Bay |
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Texas A&M University Digital Repository |
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language |
English |
topic |
sulfur cycle TRS AVS estuary |
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sulfur cycle TRS AVS estuary Thomson, Heather Controls on the sulfur cycle in estuarine sediments on the Central Texas coast |
topic_facet |
sulfur cycle TRS AVS estuary |
description |
The sedimentary sulfur cycle is one of the main components of estuarine biogeochemical systems. It is initiated by the oxidation of organic matter via sulfate reducing bacteria which produce hydrogen sulfide (H2S). The S(II) then reacts via both abiotic and biotic pathways to form sulfur with other oxidation states. The three most widely-studied “operationally”–defined components of the sedimentary sulfur system are total reduced (inorganic) sulfur (TRS), acid volatile sulfide (AVS), and dissolved (=filter-passing) sulfide. This study focused on several parameters that are widely held to be important in determining TRS in sediments and the relative proportions of TRS, AVS and dissolved S(II) forms. The formation of iron sulfide minerals requires metabolizable organic matter and SO4 2- to produce S(II) and “reactive”-Fe as a source for the iron in iron sulfide minerals. One of these components is generally the limiting factor in TRS formation (e.g., Berner 1970). Nine different sites from three locations on the Central Texas coast were studied for a variety of parameters including organic matter, sulfate concentrations, sulfate reduction rate, solid “reactive” and dissolved iron, and grain size, as well as TRS, AVS, and ΣH2S. At each site five sediment cores were taken to a depth of 20 cm whenever possible. The cores were sectioned in 2 cm intervals. The porewater was extracted and both solid and dissolved components were analyzed using a variety of methods, including carbon and sulfur coulometry, acid extraction, chromium extraction, and drying the sediment. The results of he analyses showed that the central Texas coast is a widely diverse system. Some sites were very sandy while others were fine-grained. This variety was especially true for the Nueces Bay and Baffin Bay sites. The East Matagorda Bay sites showed more homogeneity in almost all analysis. While the heterogeneity of locations along the Central Texas coast makes it difficult to make a definitive statement about the controls on TRS in this area, most ... |
author2 |
Morse, John W. Cifuentes, Luis McGuire, Jennifer |
format |
Book |
author |
Thomson, Heather |
author_facet |
Thomson, Heather |
author_sort |
Thomson, Heather |
title |
Controls on the sulfur cycle in estuarine sediments on the Central Texas coast |
title_short |
Controls on the sulfur cycle in estuarine sediments on the Central Texas coast |
title_full |
Controls on the sulfur cycle in estuarine sediments on the Central Texas coast |
title_fullStr |
Controls on the sulfur cycle in estuarine sediments on the Central Texas coast |
title_full_unstemmed |
Controls on the sulfur cycle in estuarine sediments on the Central Texas coast |
title_sort |
controls on the sulfur cycle in estuarine sediments on the central texas coast |
publishDate |
2009 |
url |
https://hdl.handle.net/1969.1/ETD-TAMU-1834 |
geographic |
Baffin Bay |
geographic_facet |
Baffin Bay |
genre |
Baffin Bay |
genre_facet |
Baffin Bay |
op_relation |
https://hdl.handle.net/1969.1/ETD-TAMU-1834 |
_version_ |
1771544236005523456 |