ISO 10136-5-1993 PDF

Full title and description

ISO 10136-5:1993 — Glass and glassware — Analysis of extract solutions — Part 5: Determination of iron(III) oxide by molecular absorption spectrometry and flame atomic absorption spectrometry. Specifies laboratory methods for measuring iron released into extract solutions from glass or glassware, reporting results as iron(III) oxide (Fe2O3).

Abstract

The standard gives two analytical routes for determination of iron in extract solutions from glass: (a) reduction of ferric iron, complexation (bathophenanthroline type reagent), extraction of the coloured complex into chloroform and measurement of optical density by molecular absorption spectrometry at 533 nm; or (b) evaporation of the extract with hydrofluoric and perchloric acids, dissolution of the residue in hydrochloric acid and quantification by flame atomic absorption spectrometry at 248.3 nm. Results are expressed as Fe2O3. The procedures apply to extract solutions obtained from any kind of glass or glassware.

General information

• Status: Published (International Standard).
• Publication date: July 1993 (1993-07).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 71.040.20 (Laboratory ware and related apparatus); 81.040.01 (Glass in general).
• Edition / version: Edition 1 (1993).
• Number of pages: 6.

Scope

This part of ISO 10136 specifies analytical methods for determining the concentration of iron released into extract solutions during hydrolytic resistance or other extraction tests on glass and glassware. It is intended for extract solutions from any type of glass or glassware (laboratory, pharmaceutical, tableware, packaging, etc.) and describes both a molecular (colourimetric) method and a flame atomic absorption method for quantifying iron as Fe2O3.

Key topics and requirements

• Principle of the two approved measurement techniques: molecular absorption spectrometry (colour complex at 533 nm) and flame atomic absorption spectrometry (AAS at 248.3 nm).
• Sample preparation: reduction and complexation for the colourimetric route; evaporation with hydrofluoric and perchloric acids and dissolution for the AAS route.
• Reagents and materials: analytical-grade reagents (reducing agents, complexing reagent such as bathophenanthroline-type ligand), chloroform for extraction, acids (HF, HClO4, HCl) for AAS sample preparation, calibration standards (iron reference solutions).
• Calibration and expression of results as iron(III) oxide (Fe2O3).
• Apparatus requirements: molecular absorption spectrometer or spectrophotometer, flame atomic absorption spectrometer, volumetric glassware, pipettes, extraction apparatus and appropriate lab safety equipment.
• Quality control and validation: use of calibration curves, blanks, and appropriate laboratory practice to ensure trace-level accuracy; attention to interferences and matrix effects.
• Safety considerations: handling of hazardous reagents, notably hydrofluoric and perchloric acids and chloroform, requiring appropriate controls and personal protective equipment.

Typical use and users

Used by analytical and QA laboratories in glass manufacturing, laboratoryware and pharmaceutical glass producers, food and beverage packaging manufacturers, materials testing labs, regulatory and conformity assessment bodies, and research groups assessing hydrolytic resistance or leaching of iron from glass.

Related standards

Other parts of the ISO 10136 series cover additional analytes and complementary methods for extract-solution analysis: ISO 10136-1 (SiO2), ISO 10136-2 (Na2O and K2O), ISO 10136-3 (CaO and MgO), ISO 10136-4 (Al2O3) and ISO 10136-6 (B2O3). Relevant ISO/TC 48/SC 7 publications and laboratory glassware references (for example ISO standards on volumetric flasks and water for analytical use) may also be consulted for normative references and test procedures.

Keywords

iron(III) oxide, Fe2O3, extract solution, glass, glassware, molecular absorption spectrometry, colourimetric method, bathophenanthroline, chloroform extraction, flame atomic absorption spectrometry, AAS, hydrolytic resistance, sample preparation, ISO 10136.

FAQ

Q: What is this standard?

A: ISO 10136-5:1993 is an International Standard that specifies analytical methods for determining iron (reported as Fe2O3) in extract solutions obtained from glass and glassware.

Q: What does it cover?

A: It covers two measurement procedures—a molecular (colourimetric) method based on extraction of a coloured complex and spectrophotometric measurement at 533 nm, and a flame atomic absorption method after acid evaporation and dissolution, measured at 248.3 nm—and sets out required reagents, apparatus and general analytical practice.

Q: Who typically uses it?

A: Analytical and quality-control laboratories in glass manufacture and testing, producers of laboratory and pharmaceutical glassware, packaging and tableware manufacturers, materials researchers, and regulatory/conformity assessment bodies concerned with leachables and hydrolytic resistance.

Q: Is it current or superseded?

A: This edition was published in July 1993. According to ISO records it has been subject to periodic review and was confirmed in prior reviews; users should check ISO or their national standards body for the latest status or any subsequent amendments or replacements before assuming applicability.

Q: Is it part of a series?

A: Yes — ISO 10136 is a multi-part series on analysis of extract solutions from glass and glassware; Part 5 is the iron(III) oxide determination method and is accompanied by Parts 1–4 and 6 which cover other oxides and elements.

Q: What are the key keywords?

A: iron(III) oxide, Fe2O3, extract solution, glass analysis, molecular absorption spectrometry, flame atomic absorption spectrometry, hydrolytic resistance, ISO 10136.