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The sample preparation is considered an essential step in the analysis process. The complexity of the matrix and how the compounds are linked is one of the main difficulties in the extraction. Thus a solvent system combined with an extraction method, both need to be effective against such mishaps. In this work we used the 23 factorial design to determine the optimum conditions for sample preparation. The analysis of the samples were performed in a molecular fluorescence spectrophotometer. The factors selected to investigate the influence on the extraction system were: time of use of ultrasound, the type of solvent (hexane or dichloromethane) and ratio solvent / sample (1:1 and 1:3). The best result was obtained with using the dichloromethane in time of 10 min of ultrasound and the ratio solvent / sample 1:3.

OPTIMIZATION OF SAMPLE PREPARATION FOR THE DETERMINATION OF HPA'S VISION IN A GEOMETRIC TECHNIQUE USING MOLECULAR FLUORESCENCE