ASTM D4471-00
Historical Standard: ASTM D4471-00 Standard Test Method for Pyridine Bases in Cresylic Acid by Direct Titration
SUPERSEDED (see Active link, below)
ASTM D4471
1. Scope
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 The following applies to all specified limits in this standard: For purposes of determining conformance with this standard, an observed value or a calculated value shall be rounded off 'to the nearest unit' in the last right-hand digit used in expressing the specification limit, in accordance with the rounding-off method of Practice E29.
1.4 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 7.
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
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 Document
OSHARegulations,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.Keywords
cresols; cresylic acids; nitrogen bases; phenol; pyridine bases; tar acids; Cresols; Cresylic acid; Impurities--organic compounds; Nitrogen impurities; Phenolic compounds; Pyridine; Tar acids;
ICS Code
ICS Number Code 71.080.30 (Organic nitrogen compounds)
DOI: 10.1520/D4471-00
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