ASTM D7637-10(2015) PDF

Scope: 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.

1.1 This test method provides the quantitative determination of glycerin by the titrimetric method. It is applicable to all glycerin or glycerin/water mixtures >758201;%.

1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.3 This standard may involve hazardous materials, operations and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of whoever uses this standard to consult the established and appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific precautions are listed in Section 8.

ASTM D7637-10(2015) Referenced Document

ASTM D1193 Standard Specification for Reagent Water
ASTM D4725 Standard Terminology for Engine Coolants
ASTM E177 Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

2021 ASTM D7637-10(2021) Standard Test Method for Determination of Glycerin Assay by Titration (Sodium Meta Periodate)
2010 ASTM D7637-10(2015) Standard Test Method for Determination of Glycerin Assay by Titration (Sodium Meta Periodate)
2010 ASTM D7637-10 Standard Test Method for Determination of Glycerin Assay by Titration (Sodium Meta Periodate)