ISO 660-2020 pdf free.Animal and vegetable fats and oils — Determination of acid value and acidity.
This document specifies three methods (two titrimetric and one potentiometric) for the determinationof acidity in animal and vegetable fats and oils,hereinafter referred to as “fats”.The acidity is expressedpreferably as acid value or, alternatively, as acidity calculated conventionally.
This document is applicable to refined and crude vegetable or animal fats and oils, soap stock fattyacids or technical fatty acids. It does not apply to waxes.
Since the methods are completely non-specific, they do not apply to differentiating between mineralacids, free fatty acids and other organic acids.The acid value, therefore, includes any mineral acids thatare present.
Milk and milk products (or fat coming from milk and milk products) are excluded from the Scope of thisdocument.
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references, only the edition cited applies.Forundated references, the latest edition of the referenced document (including any amendments) applies.
acid value:number of milligrams of potassium hydroxide required to neutralize the free fatty acids present in 1 gof fat, when determined in accordance with the procedure specified in this document.
The sample is dissolved in a suitable solvent mixture, and the acids present are titrated with anethanolic or methanolic solution of sodium or potassium hydroxide.The methods specified in 9.1 and 9.2 are reference methods.
Sodium hydroxide or potassium hydroxide standard volumetric solution, made up in eitherethanol or methanol. Substance concentration c(NaOH) or c(KOH):0,1 mol/l and 0,5 mol/l, respectively.The exact concentration of the sodium hydroxide solution (or potassium hydroxide solution) shall beknown or checked prior to use.A representative sample should be sent to the laboratory. It should not be damaged or changed duringtransport or storage.
Sampling is not part of the method specified in this document. A recommended sampling method isgiven in ISO 5555.ISO 660 pdf download.