Standard Test Method for Determination of Glycerin Assay by Titration (Sodium Meta Periodate)

Importancia y uso:

4.1 This test method is based on the cold oxidation of the glycerol by sodium metaperiodate in a strong acidic medium. Formaldehyde and formic acid are produced in this reaction and the latter is used to measure the glycerol content by titration with standard sodium hydroxide solution, to a pH 8.1 ± 0.1. The glycerol content is expressed as a percentage (m/m).

4.2 Interferences—The glycerin sample should be free of organic compounds with more than two hydroxyl groups on adjacent carbon atoms (for example, sugars, glycols). These types of compounds may produce formic acid which interferes with the determination of the glycerol content.

Subcomité:

D15.04

Referida por:

D7640-16R21

Volúmen:

15.05

Número ICS:

71.080.60 (Alcohols. Ethers)

Palabras clave:

antifreeze; engine coolant; ethylene; glycerin; glycerine; glycerol; titrimetric;