ASTM E928-96
Historical Standard: ASTM E928-96 Standard Test Method for Determination of Purity by Differential Scanning Calorimetry
SUPERSEDED (see Active link, below)
ASTM E928
1. Scope
1.1 This test method covers the determination of purity by use of differential scanning calorimetry and the evaluation of the results using the van't Hoff equation.
1.2 This test method is generally applicable to thermally stable compounds with well-defined melting temperatures.
1.3 Determination of purity by this test method is only applicable when the impurity dissolves in the melt and is insoluble in the crystal.
1.4 Computer- or electronic-based instruments, techniques, or data treatments equivalent to this test method may also be used.
Note 1--Since all data treatments are not equivalent, it is the responsibility of the user to verify equivalency prior to use.
1.5 SI values are the standard.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
1.6 There is no ISO method equivalent to this method.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
E473 Terminology Relating to Thermal Analysis and Rheology
E793 Test Method for Enthalpies of Fusion and Crystallization by Differential Scanning Calorimetry
E794 Test Method for Melting And Crystallization Temperatures By Thermal Analysis
E967 Test Method for Temperature Calibration of Differential Scanning Calorimeters and Differential Thermal Analyzers
E968 Practice for Heat Flow Calibration of Differential Scanning Calorimeters
E1970 Practice for Statistical Treatment of Thermoanalytical Data
Keywords
differential scanning calorimetry; purity; Van't Hoff equation
FIG. 3 Temperature Shift for samples that melt
FIG. 4 Temperature Shift for samples that decompose
ICS Code
ICS Number Code 17.200.10 (Heat. Calorimetry)
DOI: 10.1520/E0928-96
ASTM International is a member of CrossRef.