SIST ISO 8343:1997 PDF

Overview

ISO 8343:1985 specifies a gravimetric method for the determination of silicon content in ferronickel, applicable to concentrations from 0.2 % to 4.0 % (m/m). The method details principle, reagents, apparatus, sampling and sample preparation, step‑by‑step procedure, calculation and test reporting. It is intended for routine laboratory analysis where a reliable gravimetric measurement of silicon is required.

Key topics and technical requirements

• Principle: Dissolve the test portion in nitric and perchloric acids, dehydrate silicon to insoluble silica, filter and calcine the precipitate, volatilize silica with hydrofluoric + sulfuric acids to remove silica interferences, and determine silicon by mass difference using a conversion factor (SiO2 → Si = 0.467).
• Applicable range: 0.2–4.0 % silicon (m/m).
• Sample sizes (typical):

  • 1 % Si: 2.00 g test portion

  • 0.25–1 % Si: 4.00 g test portion