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Journal of the Brazilian Chemical Society

versión impresa ISSN 0103-5053

Resumen

SILVA, Cesar A.; OLIVEIRA, Cristiane R.; OLIVEIRA, Inês R. W. Z.  y  MADUREIRA, Luiz A. S.. Distribution of lipid compounds in sediments from Conceição Lagoon, Santa Catarina Island, Brazil. J. Braz. Chem. Soc. [online]. 2008, vol.19, n.8, pp. 1513-1522. ISSN 0103-5053.  http://dx.doi.org/10.1590/S0103-50532008000800010.

Lipid compounds from five sediment-water interface samples and a sediment core with 75 cm depth were used to assess sources of organic matter in Conceição Lagoon, located on Santa Catarina Island. The results which were based on the molar C:N:P ratios, relative abundance of sterols (dominated by the C27 sterols), n-alkanols (0.2-1.2 µg g-1), n-alkanes (0.4-5.0 µg g-1) and the Carbon Preference Index (CPI), indicated that the organic matter is predominantly of terrestrial origin (C/N > 10 and CPI > 2). Total phosphorus (TP, average 5.20 µmol g-1) and organic carbon (TOC, average 2.90 mmol g-1) contents were well correlated with the silt and clay fractions at all locations. In the sediment core, chronologically dated with the radionuclide 210Pb, the depth interval from 55 to 75 cm was dominated by the sand fraction (> 50%). However, parameters such as TOC, TP and n-alkane contents increased considerably at this depth suggesting a change in organic matter input sources.

Palabras llave : sediments; hydrocarbons; Conceição Lagoon; chromatography.

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