ISO 4279-1977 PDF

Full title and description

Aluminium fluoride for industrial use — Determination of sodium content — Flame emission spectrophotometric method. This International Standard specifies a method for determining sodium (expressed as Na2O) in industrial aluminium fluoride using fusion, acid extraction and flame-emission spectrophotometry at the sodium emission wavelength.

Abstract

Specifies a flame-emission spectrophotometric method applicable to aluminium fluoride products having sodium contents (expressed as Na2O) equal to or greater than 0.05 % (m/m). The method is based on fusion of a test portion with lithium-containing fluxes, acid extraction of the fused mass, aspiration into a flame and photometric measurement of the sodium emission (589 nm).

General information

• Status: Withdrawn.
• Publication date: November 1, 1977 (Edition 1, 1977-11).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 71.060.50 (inorganic chemicals / aluminium and aluminium compounds).
• Edition / version: Edition 1 (1977).
• Number of pages: 4 pages.

Scope

Gives a quantitative method for the determination of sodium in aluminium fluoride intended for industrial use. The procedure is suited to products with sodium contents (reported as Na2O) of 0.05 % (m/m) or greater and describes sample fusion with lithium-containing fluxes, dissolution/extraction, and determination by flame-emission spectrophotometry.

Key topics and requirements

• Applicable concentration range: sodium content expressed as Na2O ≥ 0.05 % (m/m).
• Sample preparation by controlled-temperature fusion with lithium carbonate + boric oxide or lithium carbonate + lithium tetraborate.
• Use of platinum or platinum‑gold alloy crucibles for the fusion step.
• Acid extraction of the fused mass (hydrochloric acid) prior to measurement.
• Measurement by flame-emission spectrophotometry at the sodium emission wavelength (~589 nm) with appropriate calibration.
• Precision and procedural controls typical for single‑element flame methods (blank controls, calibration standards, matrix considerations).

Typical use and users

Quality control and analytical laboratories at producers of aluminium fluoride, suppliers and users in the aluminium smelting and chemical industries; testing laboratories requiring a validated single‑element method for sodium impurity determination in AlF3 raw materials and industrial products.

Related standards

Other ISO methods for fluorides/cryolite and related materials, e.g. ISO 4277:1977 (cryolite — evaluation of free fluorides) and ISO documents on analytical spectrometric methods and vocabulary (e.g. ISO 6955 series on flame emission/atomic spectrometry terminology). These can provide complementary procedures, terminology and context for flame-emission analyses.

Keywords

Aluminium fluoride; AlF3; sodium; Na2O; flame emission spectrophotometry; flame photometry; fusion; lithium carbonate; boric oxide; lithium tetraborate; platinum crucible; hydrochloric acid extraction; analytical method; ISO 4279:1977.

FAQ

Q: What is this standard?

A: ISO 4279:1977 is an ISO analytical standard that defines a flame-emission spectrophotometric method for determining sodium content in aluminium fluoride for industrial use.

Q: What does it cover?

A: It covers sample fusion with lithium-based fluxes, extraction of the fused mass with hydrochloric acid, and measurement of sodium by flame-emission spectrophotometry (measurement at the sodium line around 589 nm). It is intended for sodium contents (as Na2O) of 0.05 % (m/m) and above.

Q: Who typically uses it?

A: Producers and purchasers of aluminium fluoride, industrial quality-control laboratories, and testing facilities supporting aluminium smelting and chemicals production use this type of method for impurity control and specification testing.

Q: Is it current or superseded?

A: ISO 4279:1977 is withdrawn. The original publication date is November 1977 and the standard was marked as withdrawn in ISO records; national catalogues show it was formally withdrawn (example withdrawal recorded by a national catalogue on 12 June 2002). Users should consult current ISO publications or national standards bodies for any replacement or updated methods.

Q: Is it part of a series?

A: It belongs to ISO chemical/analytical work under ISO/TC 47 and is conceptually related to other ISO methods for fluoride/cryolite analysis and to ISO vocabulary/technique standards for flame emission and atomic spectrometry (e.g. ISO 6955 series).

Q: What are the key keywords?

A: Aluminium fluoride, sodium, Na2O, flame emission, flame photometry, fusion, lithium carbonate, boric oxide, lithium tetraborate, platinum crucible, hydrochloric acid extraction, ISO 4279:1977.