8Y.B.Che.Determination of Free Fatty Acids in Palm oil by Near-infrared Reflectance Spectroscopy[J].J.AOCS,1998,75(5):557-562.
9Ahmed Al-Alawi,Frederick R,Van de Voort.New FTIR Method for the Determination of FFA in Oils[J].Journal of the American Oil Chemists' Society,2004,81(5):441-446.
10Y.I.Tur'yan,O.Y.Berezin,I.Kuselman,et al.pH-metric determination of acid values in vegetable oils without titration[J].J.Am.Chem.Soe.,1996(73):295-301.
