Desenvolvimento de metodologia para extração de óleos e graxas em água produzida utilizando a técnica de radiação por microondas

Abstract

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 leveis 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 leveis. 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 Inftacal 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 followed by analysis by infrared and gravimetry. However, the basic principie 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.