Standard Withdrawn, No replacement   Last Updated: Aug 08, 2012
ASTM D1721-97(2007)

Standard Test Method for Permanganate Time of Tricresyl Phosphate (Withdrawn 2012)

Standard Test Method for Permanganate Time of Tricresyl Phosphate (Withdrawn 2012)
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Significance and Use

Impurities such as phenols, if present in tricresyl phosphate, will react with potassium permanganate, reducing it to manganese dioxide. In the permanganate test, the color of the test solution is observed at the end of a 30-min period, and if the pink color is still present, the sample is considered substantially free of oxidizable impurities.

The results of this measurement can be used for specification acceptance.


1.1 This test method covers the detection in tricresyl phosphate of the presence of impurities that reduce potassium permanganate.

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

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. For specific hazard statements, see Section 6.

1.3 For hazard information and guidance, see the supplier's Material Safety Data Sheet.

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