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Significance and Use
The pyridine base content of cresylic acids is important in certain applications. This test method may be used as a tool for quality control and specification purposes by producers and users.
1.1 This test method covers the determination of pyridine and other basic nitrogen impurities in crude and refined cresylic acids streams, including mixtures.
1.2 This test method is applicable for pyridine base levels of 0.001 % to 0.5 %.
1.3 In determining the conformance of the test results using this method to applicable specifications, results shall be rounded off in accordance with the rounding-off method of Practice E29.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 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 8.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D3852 Practice for Sampling and Handling Phenol, Cresols, and Cresylic Acid
D4790 Terminology of Aromatic Hydrocarbons and Related Chemicals
D6809 Guide for Quality Control and Quality Assurance Procedures for Aromatic Hydrocarbons and Related Materials
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
Other DocumentOSHARegulations,29CF paragraphs 1910.1000 and 1910.1200 Available from U.S. Government Printing Office Superintendent of Documents, 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401.
ICS Number Code 71.080.30 (Organic nitrogen compounds)
UNSPSC Code 12191503(Phenols or its substitutes or derivatives)
ASTM D4471-10, Standard Test Method for Pyridine Bases in Cresylic Acid by Direct Titration, ASTM International, West Conshohocken, PA, 2010, www.astm.orgBack to Top