ASTM D7871-23 PDF

Overview

ASTM D7871-23: Standard Test Method for Analysis of Cyclohexane by Gas Chromatography (Effective Carbon Number) provides a precise method for determining the purity of cyclohexane and quantifying common impurities using gas chromatography (GC). Developed by ASTM International, this standard ensures reliable quality control, specification setting, and research support for industries handling cyclohexane. The test method leverages an effective carbon number (ECN) approach, making it highly suitable for quality management in manufacturing, petrochemical processing, and laboratory environments.

Key Topics

• Scope of Method: Addresses the determination of cyclohexane purity and the measurement of specific impurities in cyclohexane using gas chromatography with a flame ionization detector (FID) and ECN correction factors.
• Detection Limits: The method detects impurities down to 0.7 mg/kg (limit of detection, LOD) and can quantify them at levels as low as 2.3 mg/kg (limit of quantitation, LOQ).
• Impurity Range: Effective for common cyclohexane impurities (e.g., alkanes, cyclopentane, benzene, toluene, methylcyclohexane) with concentrations up to 400 mg/kg.
• Quality Control: Recommended for internal laboratory quality checks and specification compliance. Procedures include equipment setup verification, calibration, and ongoing instrument sensitivity checks.
• Units: All measurements are reported in SI units, ensuring international compatibility and traceability.
• Safety & Compliance: Users are responsible for following appropriate safety, health, and regulatory procedures when implementing this test method.

Applications

ASTM D7871-23 offers practical benefits across multiple sectors:

• Cyclohexane Production: Supports manufacturers in verifying product purity, ensuring quality assurance, and meeting customer specifications.
• Chemical Manufacturing: Facilitates process control where cyclohexane serves as an intermediate or solvent, preventing contamination from regular impurities.
• Research & Development: Useful for experimental analysis in the development of new cyclohexane-containing formulations or products.
• Regulatory Compliance: Helps organizations demonstrate compliance with industry and international standards for cyclohexane purity.
• Quality Assurance Laboratories: Provides a reliable approach for third-party and internal labs to assess the purity of cyclohexane samples, interpret results, and resolve disputes.

Related Standards

Compliance with ASTM D7871-23 can involve reference to additional ASTM and regulatory standards, including:

• ASTM D3437: Practice for Sampling and Handling Liquid Cyclic Products
• ASTM D4790: Terminology of Aromatic Hydrocarbons and Related Chemicals
• ASTM D6809: Guide for Quality Control and Quality Assurance Procedures for Aromatic Hydrocarbons and Related Materials
• ASTM E29: Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
• ASTM E355: Practice for Gas Chromatography Terms and Relationships
• ASTM E1510: Practice for Installing Fused Silica Open Tubular Capillary Columns in Gas Chromatographs
• OSHA Regulations 29 CFR 1910.1000, 1910.1200: Referenced for workplace safety and material handling

Summary

Adhering to ASTM D7871-23 ensures rigorous analysis and reporting of cyclohexane purity and its common contaminants through a proven and repeatable gas chromatography method. This standard is essential for quality control in global cyclohexane supply chains, supporting both industrial operations and compliance with international best practices. Key advantages include accurate detection of impurities, robust documentation for regulatory purposes, and greater confidence in cyclohexane product integrity. For optimal implementation, users should ensure laboratory quality systems align with this and related ASTM standards.