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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Aricetti et al. (2012) studied this question.
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