ASTM D4471-22 PDF

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 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section 8. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

ASTM D4471-22 Referenced Document

ASTM D3852 Standard Practice for Sampling and Handling Phenol, Cresols, and Cresylic Acid
ASTM D4790 Standard Terminology of Aromatic Hydrocarbons and Related Chemicals
ASTM D6809 Standard Guide for Quality Control and Quality Assurance Procedures for Aromatic Hydrocarbons and Related Materials
ASTM E29 Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

2022 ASTM D4471-22 Standard Test Method for Pyridine Bases in Cresylic Acid by Direct Titration
2018 ASTM D4471-18 Standard Test Method for Pyridine Bases in Cresylic Acid by Direct Titration
2010 ASTM D4471-10 Standard Test Method for Pyridine Bases in Cresylic Acid by Direct Titration
2000 ASTM D4471-00(2004) Standard Test Method for Pyridine Bases in Cresylic Acid by Direct Titration
2000 ASTM D4471-00 Standard Test Method for Pyridine Bases in Cresylic Acid by Direct Titration