In determining the Oils and Greases contents (TOG), one of the most important step is the extraction procedure, because at this stage occur the segregation of oils and greases from water produced. It is noteworthy that some samples with low levels of TOG in their composition often are not determined by the standard method of reference. In this case, it is essential the availability of a technique that allows the detection and quantification of these low levels. For this reason, this work aims to optimize the determination of oils and greases using a technique of microwave extraction, followed by the determination in the Infrared Spectrometry through the analyzer Infracal TOG/TPH. The evaluation of the efficiency of the proposed methodology was performed by comparison with the conventional technique whose the extraction of organic matter (oils and greases) is done by manual agitation. However, the basic principle of the technique by microwave radiation is in the process of heating/cooling the sample to promote a more efficient extraction of organic matter. The two techniques were evaluated through the following parameters: sample-solvent proportion and time of extraction at 2, 4 and 6 minutes. According to the comparison of results between them, was observed that the replacement of manual extraction by microwave one was more efficient. Introduction The oils and greases contents (TOG) constitutes in one of the environmental parameters of greatest relevance to the petroleum industry. The limits set for this parameter are recommended by Resolution 393 of August 2007 of CONAMA, which limits oils and greases to the disposal of produced water in platforms must obey to simple arithmetic average monthly concentration of oils and greases up to 29 mg/L with maximum daily value of 42 mg/L. For the monitoring of this parameter is necessary to use effective analytical techniques to assess the possible impacts caused by petrochemical activity. Facing this, emerge studies in order to optimize the determination of TOG in produced water. As a focus of this study, was conducted an evaluation the comparison between two methods of extraction: one by manual technique and the other by the microwave radiation one. According (COELHO, 2002 apud KINGSTON, 1986), the introduction of digesters based on microwave radiation was a major innovation for treatment of samples. The microwave energy is a non-ionizing electromagnetic radiation that causes the movement of the species in solution by the migration of ions and/or dipole rotations, caused by the high number of times the electromagnetic field is alternating (ARRUDA, 1997 apd KINGSTON, 1988). Moreover, occur the heating of the exposed material due to radiation MO which is a function of the interaction of electromagnetic wave with the electric dipole of the molecule. When the field is applied, the molecules that have the electric dipole moment tend to align with the field. When the field that led to the orientation of molecular dipoles is removed will occur a dielectric relaxation, in other words, the molecules will tend to return to its previous state, dissipating the absorbed energy as heat. (COUTINHO et al., 2005).

Gasoline and diesel leaks in underground storage tanks contaminate soils with petroleum hydrocarbons. Various techniques using surfactants have been proposed to remedy this type of contamination. This study presents the application of different systems containing surfactants in vapor phase. It compares the removal efficiencies of diesel contaminated soils using vapor injection systems: surfactant water solutions, micro-emulsions, and nano-emulsions. The surfactant used in the experiments was ethoxylated alcohol UNTL-90 in aqueous solution, in nano-emulsion, and micro-emulsion systems. Among the systems investigated, the nano-emulsion showed the highest removal efficiency (88%), being environmentally friendly and technically feasible with a system that has a lower content of active matter.