This research project aims to assess the organic matter (OM) in Estuary-Lagoon System Cananéia-Iguape by FT-ICR MS in order to identify unexplored compounds classes in organic geochemistry. The results about sedimentary OM composition will be evaluated and correlated with aspects such as: opening of the Valo Grande Canal (nineteenth century), sedimentation rate, primary production and eutrophication. This project has great importance, since the study area is one of the most important nurseries of marine life on the planet and the changes in the OM cycle as well as the pollutants input may definitely compromise the ecosystem sustainability. The experimental study includes the sample preparation step and the employment of the ionization techniques ESI, APCI and APPI, all in positive and negative mode. Therefore, the OM will be widely characterized, obtaining information about different compounds classes. The data processing and interpretation will be developed by recognition of regular mass spacing patterns, which represent ions of the some homologous series. Two and three-dimensional Van Krevelen diagrams and multivariate statistical analysis will be used to evaluate the relationships among sample sets, the OM composition and its changes recorded along each sediment core collected. Quantitative analysis, which is important for anthropogenic origin compounds, will be developed through GC-MS and LC-MS/MS techniques. Further, the results will be related to granulometric data, geochronological dating and isotopic composition in order to obtain the environment historical reconstruction and evolution, as well as to assess the anthropogenic influence in that region.
News published in Agência FAPESP Newsletter about the scholarship: