The goal of this research was to evaluate the biodegradation of diesel by a microbial consortium collected in a region close to distributors of fuel. The experiments were monitored by SPME-GC-FID and SPME-GC-MS. The consortium showed a high potential for production of biosurfactants, presenting an emulsification index of 53%. The consortium degraded completely n-alkanes, while dimethylnaphtalene, hepthyl-cyclohexane and 2,6,10-trimethyl-undecane were partially degraded and pristane was not degraded. From this consortium five strains were isolated and identified as Acinetobacter baumannii. Based on this initial investigation this consortium appears to be effective for bioremediation in Porto Velho - RO region.

Tucker-3 model offers several advantages for analysis of environmental data but its interpretation is still challenging. A Tucker-3 model was applied to a biodegradation experiment involving a large number of overlapped chromatographic peaks and a temporal variation. The Tucker-3 model allowed the data to be decomposed in two processes: evaporation and biodegradation. The results suggest that linear hydrocarbons were those biodegraded first and demonstrate that the data analysis can be simplified by interpreting the elements of the core array. The approach discussed in this work can be applied in similar problems involving multi-way data in other areas of chemistry.

Reduzir o teor de monômero residual é uma preocupação de qualquer produtor de polímeros, pois produtos sem, ou com teores muito baixos de monômero residual, apresentam um apelo comercial diferenciado. Neste trabalho são apresentadas e testadas experimentalmente diversas estratégias para reduzir o teor de monômero residual de copolímeros estireno/acrilato de butila produzidos em reações semicontínuas de polimerização em emulsão, que são amplamente utilizados nas indústrias de papel e tintas. Estas estratégias envolvem a adição contínua de iniciador e/ou o aumento da temperatura do reator durante a última etapa da reação, além da adição de um agente redutor e/ou de um iniciador solúvel na fase orgânica. Verificou-se que a combinação adequada de diferentes técnicas pode levar a uma redução significativa no teor residual de monômeros no látex.

Reducing the residual monomer content is a major concern of every polymer producer, as products with no, or very low levels of residual monomer have a marked commercial appeal. Styrene / butyl acrylate copolymers produced in emulsion polymerization reactions are widely applied in paper and paint industries. In this work, several strategies to reduce the residual monomer content of styrene and butyl acrylate copolymers produced in semicontinuous emulsion polymerization reactions are presented and tested. These strategies involve the continuous addition of initiator, increasing the reaction temperature during the last stage of the reaction, and adding a reducing agent or an initiator that is soluble in the organic phase at this last stage. The adequate combination of some of these techniques may result in a significant reduction of the residual monomer content in the final latex.