Overview
ISO 10136-4:1993 specifies an analytical procedure for the determination of aluminium oxide (Al₂O₃) in extract solutions from glass and glassware using molecular absorption spectrometry. The method involves complexing aluminium in the extract solution with chromazurol S and measuring optical density at 545 nm. This standard is applicable to all types of glassware, including laboratory, pharmaceutical, food and beverage packaging, tableware, and kitchenware. It provides a reliable approach for accurately quantifying low levels of aluminium oxide, crucial for assessing the chemical durability and safety of glass products.
Key Topics
- Molecular Absorption Spectrometry: Utilizes chromazurol S to form a color complex with aluminium for precise measurement at 545 nm.
- Sample Preparation: Details procedures for preparing extract solutions from different types of glassware.
- Sensitivity: Enables detection of extremely low concentrations of aluminium, essential for quality control and safety compliance.
- Applicable Glass Types: Works with borosilicate glass, soda-lime-silica glass, neutral glass, and more.
- Buffering and Acidification: Ensures sample integrity by recommending acidification steps to dissolve any aluminium hydroxides or carbonates before analysis.
- Blank and Calibration Solutions: Instructs on the use and preparation of standard and blank solutions for accurate calibration and result validation.
Applications
ISO 10136-4:1993 is widely used in the following areas:
- Laboratory Glassware Assessment: Essential for verifying the chemical resistance and purity of laboratory glass containers, pipettes, beakers, and volumetric flasks.
- Pharmaceutical Glassware Testing: Ensures glass ampoules, vials, and other pharmaceutical containers do not release harmful amounts of aluminium into medicines.
- Food and Beverage Packaging: Supports compliance for jars, bottles, and other food-contact glassware by preventing contamination from extractable aluminium.
- Quality Control: Used by manufacturers and quality assurance laboratories to maintain stringent product standards.
- Regulatory Compliance: Assists organizations in meeting international safety and performance requirements for glassware in laboratory and consumer settings.
- Research and Development: Facilitates the investigation of glass composition, durability, and resistance to leaching under various conditions.
Related Standards
For a comprehensive approach to glass and glassware analysis, consider the following related ISO standards:
- ISO 10136-1: Determination of silicon dioxide (SiO₂) by molecular absorption spectrometry.
- ISO 10136-2: Determination of sodium oxide and potassium oxide by flame spectrometric methods.
- ISO 10136-3: Determination of calcium and magnesium oxides by flame atomic absorption spectrometry.
- ISO 10136-5: Determination of iron(III) oxide by molecular and flame atomic absorption spectrometry.
- ISO 10136-6: Determination of boron(III) oxide by molecular absorption spectrometry.
- ISO 3585: Borosilicate glass 3.3 - Properties.
- ISO 719 and ISO 720: Methods for testing the hydrolytic resistance of glass grains.
- ISO 4802-1 and ISO 4802-2: Testing hydrolytic resistance of the interior surfaces of glass containers.
- ISO 3696: Specification for water used in analytical laboratory environments.
Summary
ISO 10136-4:1993 is a critical standard for the determination of aluminium oxide in glass extract solutions via molecular absorption spectrometry. Its application ensures safety, quality, and regulatory compliance of glass products used across laboratories, pharmaceuticals, and the food and beverage industry. By following this method, organizations can guarantee the chemical durability and performance of their glassware, supporting both consumer safety and industry best practices.