Analytical pyrolysis of suspended particulate organic matter from the Black Sea water column

2006-01-01
Coban-Yildiz, Yesim
Fabbri, Daniele
Baravelli, Valentina
Vassura, Ivano
Yilmaz, Aysen
Tuğrul, Süleyman
Eker-Develi, Elif
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The chemical composition of suspended particulate organic matter (SPOM) in the Black Sea water column has been characterized by pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS). The results are discussed in terms of the hydro-chemical properties of the water column. Phytoplankton cultures grown in the lab also were analyzed to provide reference information for the euphotic zone SPOM. The composition of SPOM in the Black Sea displays important vertical variations dependent on specific distinct biochemical processes in the water column. Identical pyrolysis markers indicative for proteins, lipids, carbohydrates and chlorophylls were obtained from SPOM in the euphotic zone of the Black Sea and the phytoplankton cultures. Nevertheless, the relative contribution of lipids and carbohydrates to Black Sea SPOM was higher than in phytoplankton cultures. The lipid to protein ratio throughout the water column seems to determine the C/N ratio of SPOM. Below the oxycline, the relative contribution of proteins to the SPOM pool increased while the lipid content of the SPOM decreased. The protein composition changed substantially in the suboxic/anoxic transition zone, as expressed by the increase in pyrrole/indole ratio. Elemental sulfur was observed in particulates suspended at the upper anoxic zone, and the relative intensity of the S-8 peak varied regionally with more intense multipeaks in SW shelf-break station, in agreement with the lateral flux Of O-2. Sulfur-containing organic compounds (e.g. thiophenes), including organic polysulphides (e.g. 1,2-dithiole-3-thiones) were detected in some deep anoxic samples, indicating that sulphurization of organic matter may be active in the water column.
Oceanography
https://hdl.handle.net/11511/57985
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
Graduate School of Marine Sciences, Article

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Citation Formats
Y. Coban-Yildiz et al., “Analytical pyrolysis of suspended particulate organic matter from the Black Sea water column,” DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY, pp. 1856–1874, 2006, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/57985.
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