ISO 2367:1972 PDF

Cryolite (natural and artificial) — Determination of aluminium content — 8- Hydroxyquinoline gravimetric method

Open preview (PDF)

Title (English):

ISO 2367:1972

Cryolite (natural and artificial) — Determination of aluminium content — 8- Hydroxyquinoline gravimetric method

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 3
Publication date:: December 1, 1972
Edition:: ISO IS 2367 edition 1 version 1
ICS:: 71.060.50

Delivery type:

Full version25 €Read online 24h10 €Read online 72h15 €

Document language:

enru

Delivery time:Immediate download

Price:25 €

Description (English):

The method can be applied provided the Fe203 content does not exceed 0,15 . It can also be applied to products with molar ratio of NaF to AlF3 between approximately 3 and 1,7. The principle consists in dissolution of a test portion by acid fusion using potassium pyrosulphate and recovery by hydrochloric acid. Separation of the mixture by precipitation of aluminium, with ammonium benzoate , in an acetic reducing medium. Dissolution of the precipitate and reprecipitation as aluminium tri(quinolin-8-oxide) in an acetic buffer medium. Filtration, washing, drying of the precipitate at a temperature of 130 °C and weighing.

Technical details

Technical committee: ISO/TC 226 - Materials for the production of primary aluminium
SKU: ISO 2367:1972

Abstract

Overview

ISO 2367:1972 specifies a gravimetric method using 8‑hydroxyquinoline (quinolinol‑8) for determining aluminium content in cryolite (natural and artificial). The procedure covers sample fusion, chemical separation, precipitation of aluminium as an aluminium–quinoline complex, and gravimetric weighing to obtain aluminium content expressed as percent Al.

Key topics and requirements

Scope and limits
- Applicable to natural and artificial cryolite provided Fe2O3 ≤ 0.15%.
- Also applicable to products with a molar ratio NaF : AlF3 ≈ 3 to 1.7.
Analytical principle
- Acid fusion of a weighed test portion with potassium pyrosulfate (K2S2O7).
- Recovery into hydrochloric acid, removal of interfering elements, and precipitation of aluminium with ammonium benzoate in an acetic reducing medium.
- Re‑dissolution and reprecipitation as aluminium tri(quinolin‑8‑oxide) (tri(quinolinolate‑8)), followed by filtration, washing, drying at 130 °C, and weighing.
Reagents & apparatus (examples from the method)
- Reagents: hydroxy‑8‑quinoline (20 g/L in acetic acid), ammonium benzoate solutions, acetic buffer, sodium sulfite, HCl, sulfuric acid, tartric acid, ammonia.
- Apparatus: platinum crucible, electric furnace (750 ± 25 °C), glass‑fritted crucible (porosity 3–15 μm), drying oven at 130 °C.
Calculation
- Aluminium content is calculated gravimetrically using the mass of the dried aluminium tri(quinolinolate‑8) precipitate and a conversion factor (method provides factor 0.0587).

Applications and users

Who uses this standard
- Chemical and materials testing laboratories performing cryolite analysis.
- Quality control teams at producers or processors of cryolite and related mineral products.
- Metallurgical/industrial laboratories requiring a validated gravimetric aluminium determination for specification compliance or material certification.
Practical uses
- Routine determination of aluminium content in cryolite batches.
- Verification of product conformity where low levels of iron and defined NaF:AlF3 ratios are present.
- Baseline method for comparison with other analytical techniques in mineral analysis.

Related standards

ISO/R 1619 (preparation and conservation of samples for testing) is referenced in the method for sample handling and preparation.

Keywords: ISO 2367, cryolite analysis, aluminium determination, 8‑hydroxyquinoline gravimetric method, gravimetric analysis, aluminium content, cryolite standard, mineral testing.

Related standards

Mentioned in the description and other ISO standards

Abstract

Overview

Key topics and requirements

Scope and limits
- Applicable to natural and artificial cryolite provided Fe2O3 ≤ 0.15%.
- Also applicable to products with a molar ratio NaF : AlF3 ≈ 3 to 1.7.
Analytical principle
- Acid fusion of a weighed test portion with potassium pyrosulfate (K2S2O7).
- Recovery into hydrochloric acid, removal of interfering elements, and precipitation of aluminium with ammonium benzoate in an acetic reducing medium.
- Re‑dissolution and reprecipitation as aluminium tri(quinolin‑8‑oxide) (tri(quinolinolate‑8)), followed by filtration, washing, drying at 130 °C, and weighing.
Reagents & apparatus (examples from the method)
- Reagents: hydroxy‑8‑quinoline (20 g/L in acetic acid), ammonium benzoate solutions, acetic buffer, sodium sulfite, HCl, sulfuric acid, tartric acid, ammonia.
- Apparatus: platinum crucible, electric furnace (750 ± 25 °C), glass‑fritted crucible (porosity 3–15 μm), drying oven at 130 °C.
Calculation
- Aluminium content is calculated gravimetrically using the mass of the dried aluminium tri(quinolinolate‑8) precipitate and a conversion factor (method provides factor 0.0587).

Applications and users

Who uses this standard
- Chemical and materials testing laboratories performing cryolite analysis.
- Quality control teams at producers or processors of cryolite and related mineral products.
- Metallurgical/industrial laboratories requiring a validated gravimetric aluminium determination for specification compliance or material certification.
Practical uses
- Routine determination of aluminium content in cryolite batches.
- Verification of product conformity where low levels of iron and defined NaF:AlF3 ratios are present.
- Baseline method for comparison with other analytical techniques in mineral analysis.

Related standards

ISO/R 1619 (preparation and conservation of samples for testing) is referenced in the method for sample handling and preparation.

Keywords: ISO 2367, cryolite analysis, aluminium determination, 8‑hydroxyquinoline gravimetric method, gravimetric analysis, aluminium content, cryolite standard, mineral testing.

ISO 2367:1972 PDF

Technical details

Abstract

Overview

Key topics and requirements

Applications and users

Related standards

Related standards

Abstract

Overview

Key topics and requirements

Applications and users

Related standards

Related standards

Cosmetics - Sun protection test methods - In vitro determination of sun protection factor (SPF) (ISO 23675:20…

Systems and software engineering — Software life cycle processes

Asset management — Vocabulary, overview and principles

Asset management — Asset management system — Requirements

Information technology — Radio frequency identification device conformance test methods — Part 2: Test method…

Information technology — Multimedia framework (MPEG-21) — Part 22: User Description

Milk — Determination of the lactoperoxidase activity — Photometric method (Reference method)

Carbonaceous materials for the production of aluminium — Cold and tepid ramming pastes — Expansion/shrinkage…