A Visual Titration Method for the Determination of the Acid Number of Oils and Fats: a Green Alternative |
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Authors: | J. A. Aricetti M. Tubino |
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Affiliation: | 1. Institute of Chemistry, University of Campinas, P.O. Box 6154, Campinas, SP, 13083-970, Brazil
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Abstract: | A visual and green titrimetric method is proposed for the determination of the acid number of oils and fats. The sample is dissolved in a water–ethanol mixture (1:1 v/v) and titrated with a 0.02?mol L?1 aqueous NaOH solution. Phenolphthalein is used as acid-basic indicator. Oils of canola, sunflower, linseed, castor, corn and soy as well as swine lard, a total of twelve real samples, were analyzed. The results obtained were compared with those from the application of the AOCS Cd 3d-63 method, through a statistical linear regression procedure at the 95?% confidence level and no evidence for systematic differences between the two sets of results was observed. The mean RSD (relative standard deviation ) for the proposed procedure is 4.8?%, whereas that of the official method was found to be 5.4?%. |
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