"Methodology for determination of organic geochemistry biomarkers in sediment - Aliphatic hydrocarbons, PAHs, Sterols and Alkenones" / "Metodologia para determinação de biomarcadores geoquímicos orgânicos em sedimentos - Hidrocarbonetos Alifáticos e Aromáticos, Esteróis e Alquenonas"

AUTOR(ES)

Rafael André Lourenço

DATA DE PUBLICAÇÃO

2003

RESUMO

The fate of most organic matter in the oceans is the marine sediment. This preserved organic matter became an unique reservoir of information about the operation of biogeochemical processes in the geological past, and how these processes responded to environmental changes. Some molecules are only synthesized by sea organisms, others only by higher plants. The relative abundance among these compounds in sea sediments can be used to determine the source of the organic matter. Other organic compounds, without natural sources, are an indicative of anthropogenic influence. The marine sediment also can accumulate compounds with the specific biological sources, which structures are influenced by the enzymatic control of the precursor organisms. All of these compounds, which can provide clear evidences of its sources or information about oceanographic conditions, are called biological markers or biomarkers. The present work put out an analytic method to identify and quantify biomarkers like aliphatic hydrocarbons, PAHs, sterols and alkenones with only one lipidic extraction. This method was evaluated by several analytic criteria and validated by reference material and by interlaboratory comparison study. The method was used to analyze a marine sediment core from Cabo Frio. The alkenones quantification in this core allowed not only appreciate changes in the sea surface temperature (SST) along the years and correlate them with changes in the upwelling, but also verify how the other biomarkers responded to SST changes.

ASSUNTO(S)

aliphatic hydrocarbons paleotemperaturas uk37 biomarkers hidrocarbonetos alifáticos alkenones alquenonas sterols esteróis pahs uk37 biomarcadores pahs paleotemperatures

Documentos Relacionados

• Liquid-liquid equilibrium in systems including aromatic hydrocarbons, aliphatic and sulfolane
• Evaluation of fecal sterols and geochemical markers hydrocarbons in sediments from Admiralty Bay, Antartica.
• Determinação de fontes de hidrocarbonetos policíclicos aromáticos e alifáticos em sedimentos de ambientes aquáticos
• "Metodologia para Determinação de Hidrocarbonetos Policíclicos Aromáticos em Sedimentos e Solos Periféricos à Represa São Pedro Juiz de Fora, MG"
• Equilibrio liquido-liquido em sistemas contendo hidrocarbonetos aromaticos + hidrocarbonetos alifaticos + liquidos ionicos