|Support type:||Scholarships in Brazil - Doctorate|
|Effective date (Start):||March 01, 2013|
|Effective date (End):||February 28, 2017|
|Field of knowledge:||Physical Sciences and Mathematics - Chemistry|
|Principal Investigator:||André Henrique Rosa|
|Grantee:||Erik Sartori Jeunon Gontijo|
|Home Institution:||Universidade Estadual Paulista (UNESP). Campus Experimental de Sorocaba. Sorocaba , SP, Brazil|
The Iron Quadrangle (Quadrilátero Ferrífero, QF) is an area rich in mineral deposits located in the south-eastern part of Brazil. In this region, mining has contributed to the release of metals and metalloids, which are readily available for interactions in the environment. In this context, arsenic is a trace element that has caused concern because it is very toxic to humans and appears naturally in higher levels in the QF. There are few studies designed to understand the process of As cycling in the country, so this project will contribute to understand the behaviour of this metalloid in QF in particular its interaction with natural organic matter/humic substances. Samples of water will be collected in 4 campaigns involving the dry and rainy seasons in different parts of the QF. Some physico-chemical parameters, major and trace elements will be analysed. The aquatic humic substances (AHS) of the samples will be extracted and structurally characterized using 13C NMR and elemental analysis. In addition some experiments will be performed to assess the ability of complexing and lability of As by AHS. Multivariate analyses will be performed in order to facilitate the visualization and interpretation of the results, which will be correlated with the structural information of SHA and complexation of As ions. Furthermore, tests of distribution and intermolecular rearrangements will be carried out adding As, Al, Mn, Mg and Fe in a solution with some content of SH. The results from the QF will be compared with data collected from waters in two campaigns in Germany, in order to investigate how AHA formed in different climate zones affect the complexation of As. At the end of this project it is intended to investigate the presence and investigate the mechanisms/conditions that influence the availability and complexation of As in QF.