ISO 10136-1-1993 PDF

Full title and description

ISO 10136-1:1993 — Glass and glassware — Analysis of extract solutions — Part 1: Determination of silicon dioxide by molecular absorption spectrometry. Specifies a wet-chemistry, colorimetric/molecular absorption method for measuring silicon expressed as silicon dioxide (SiO2) in extract solutions obtained from any kind of glass or glassware (laboratory and pharmaceutical ware, food and drink packaging, tableware, kitchenware). The method develops the blue silicomolybdate complex (using ammonium molybdate and a reducing reagent) and measures its optical density at 800 nm in 10 mm cells.

Abstract

This part of ISO 10136 defines the conditioning of extract solutions, formation of the silicomolybdate complex, and measurement procedures using a molecular absorption spectrometer at 800 nm to determine silicon as SiO2. It includes reagent and calibration requirements, measurement conditions and calculation of results. The procedure is intended for analyzing leachable silicon from glass and glassware into extractants used in conformity and safety testing.

General information

• Status: Published (confirmed current as reviewed by ISO).
• Publication date: July 1993 (Edition 1 — 1 July 1993).
• 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: 5 pages (concise method specification).

Scope

Applies to the determination of silicon (reported as SiO2) in extract solutions obtained from any glass or glassware by forming the blue silicomolybdate complex and measuring its absorbance at 800 nm using 10 mm optical cells. The standard covers sample conditioning, reagent preparation, measurement conditions, calibration and calculation — all aimed at quantifying silicon leached into extractants for conformity, safety and research testing of glass articles.

Key topics and requirements

• Preparation and conditioning of extract solutions obtained from glass and glassware.
• Formation of the blue silicomolybdate complex using ammonium molybdate and a reducing reagent.
• Measurement of optical density at 800 nm with molecular absorption spectrometry (10 mm cells).
• Calibration and expression of results as silicon dioxide (SiO2).
• Reagent specifications, blank and reference solutions, and basic quality checks to ensure valid measurements.
• Applicability to a wide range of glass articles including laboratory, pharmaceutical, food/drink packaging, tableware and kitchenware.

Typical use and users

Used by analytical and materials testing laboratories, glassware manufacturers, quality and compliance teams, and regulatory bodies concerned with leachable substances from glass. Typical applications include routine quality control, product safety testing, investigation of glass corrosion/leaching, and validation of packaging and laboratory ware for contact with food, pharmaceuticals or chemicals.

Related standards

ISO 10136 is a multi-part series for analysis of extract solutions; the closely related Part 2 (ISO 10136-2:1993) covers determination of sodium oxide and potassium oxide by flame spectrometric methods. Other ISO standards and technical committee work related to glass and laboratory ware (ISO/TC 48 and its subcommittees) provide complementary test methods and safety criteria for glassware and related apparatus.

Keywords

Glass, glassware, extract solutions, silicon, SiO2, silicomolybdate, molecular absorption spectrometry, colorimetry, ammonium molybdate, 800 nm, laboratory ware, packaging, leachable, test method.

FAQ

Q: What is this standard?

A: ISO 10136-1:1993 is an international standard that specifies a method to determine silicon (reported as SiO2) in extract solutions from glass and glassware using the silicomolybdate color complex and molecular absorption measurement at 800 nm.

Q: What does it cover?

A: It covers sample conditioning, reagent and complex formation (blue silicomolybdate), spectrometric measurement conditions (800 nm, 10 mm cells), calibration and calculation of silicon content as SiO2 in extract solutions from glass articles.

Q: Who typically uses it?

A: Analytical laboratories, manufacturers of glass and glassware, quality assurance teams, regulatory laboratories and researchers performing leachability or conformity testing on glass products used for laboratory, pharmaceutical, food and household applications.

Q: Is it current or superseded?

A: The edition was published in July 1993 (Edition 1). The document has been subject to ISO systematic review cycles and was confirmed as current during ISO review activity; users should check with the national standards body or ISO for the absolute latest status before purchase or citation.

Q: Is it part of a series?

A: Yes — ISO 10136 is a series dealing with analysis of extract solutions from glass. Part 1 covers SiO2 determination; Part 2 (ISO 10136-2:1993) addresses sodium oxide and potassium oxide by flame spectrometric methods.

Q: What are the key keywords?

A: Glass, glassware, extract solutions, SiO2, silicomolybdate, molecular absorption spectrometry, colorimetric method, leachables, laboratory ware.