ASTM E342-23 PDF

Overview

ASTM E342-23: Standard Test Method for Determination of Chromium Oxide in Chrome Ores by Permanganate Titrimetry specifies procedures for accurately measuring the chromium oxide (Cr₂O₃) content in chromium-bearing ores. This standard is essential for compliance with compositional specifications in mining, metallurgy, and quality assurance industries. The method utilizes permanganate titrimetry, providing a reliable measurement of chromium oxide mass fractions ranging from 25% to 60%. All values are expressed in SI units, ensuring consistency in global applications.

Key Topics

• Scope and Purpose

  • Applicable to chrome ores with 25% to 60% Cr₂O₃ content
  • Designed for use by trained analysts in a well-equipped laboratory setting
  • Intended for quality control and compliance with industry specifications

• Method Summary

  • Sample is decomposed by sodium peroxide fusion
  • Chromium is oxidized and converted to chromate
  • Excess reducing agent is titrated with standardized potassium permanganate solution

• Quality Assurance

  • Recommends adherence to rigorous quality control practices, such as those in ASTM E882
  • Use of reagent-grade chemicals and proper laboratory water as specified
  • Encourages use of accepted reference materials to assess method bias

• Safety and Environmental Considerations

  • Requires users to follow appropriate laboratory safety and waste disposal protocols
  • Hazards and precautions are detailed in related ASTM practices (e.g., ASTM E50)

• Precision

  • Precision data show repeatable results among participating laboratories, supporting the method’s reliability for industrial contexts

Applications

• Mining and Ore Processing

  • Used to assess and verify the chromium oxide content in extracted chrome ores before processing or shipment
  • Ensures compliance with buyer and regulatory requirements for ore quality

• Metallurgical Quality Control

  • Supports alloy and stainless steel production by verifying raw material inputs
  • Critical for producers to meet strict material specifications and maintain product quality

• Commercial Trade and Supply Chain

  • Certifies chromium content for contractual agreements and specifications in international trade of chrome ores

• Environmental and Regulatory Compliance

  • Provides documented, standardized procedures needed for environmental reporting and compliance with industry standards

Related Standards

• ASTM D1193: Specification for Reagent Water - ensures water used in chemical analysis meets quality requirements
• ASTM E29: Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
• ASTM E50: Practices for Apparatus, Reagents, and Safety Considerations for Chemical Analysis of Metals, Ores, and Related Materials
• ASTM E135: Terminology Relating to Analytical Chemistry for Metals, Ores, and Related Materials
• ASTM E276: Test Method for Particle Size or Screen Analysis at 4.75 mm (No. 4) Sieve and Finer for Metal-Bearing Ores and Related Materials
• ASTM E882: Guide for Accountability and Quality Control in the Chemical Analysis Laboratory

Practical Value

ASTM E342-23 delivers a clear, internationally recognized framework for determining chromium oxide content in chrome ores. By employing permanganate titrimetry, laboratories and producers gain:

• Reliable compliance with compositional specifications
• Standardized reporting for quality assurance and regulatory submissions
• Confidence in the accuracy, safety, and environmental alignment of their testing protocols

This standard is a cornerstone for stakeholders in mining, metallurgy, and chemical analysis seeking accurate, reproducible chromium oxide results in chrome ore assessment.