ISO 3980:1977 pdf download.Aluminium and aluminium alloys — Determination of copper — Atomic absorption spectrophotometric method.
The method is applicable to copper contents between 0,005 and 5 % (m/m). Specifies principle, reagents, apparatus, sampling, procedure, expression of results and test report.
ISO 3980:1977 specifies a method for the determination of copper in aluminium and its alloys by atomic absorption spectrophotometry.
3 PRINCIPLE
Dissolution of a test portion with hydrochloric acid and hydrogen peroxide. Atomization of this solution into an air-acetylene (or nitrous oxide-acetylene) flame of the atomic absorption apparatus. Comparison of the absorption of the resonance energy of copper (wavelength normally 324,7 nm) with that of calibration solutions.
7 PROCEDURE
7.1 Test portion
Weigh, to the nearest 0,001 g, 1 g of the test sample (6.2).
7.2 Establishment of the calibration curves
7.2.1 Preparation of the reference solutions
7.2.1.1 COPPER CONTENTS BETWEEN 0,005 AND 0,05 %
To a series of seven 100 ml volumetric flasks transfer the volumes of the standard copper solutions (4.7 and 4.8) shown In table 1, using the burette (5.1). Add to each flask 50 ml of the aluminium solution (4.6); make up to volume and mix.ISO 3980:1977 pdf download.