Name: ISO 7520:1985 — Ferronickel — Determination of cobalt content — Flame atomic absorption spectrometric method
SKU: ISO 7520:1985
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ISO 7520:1985 PDF — Ferronickel — Determination of cobalt content — Flame atomic absorpti… — GOST Standards

Scope and Applicability The method targets cobalt content determination specifically in ferro-nickel alloys with cobalt levels between 0.025% and 2.5%. It caters to both commercial and research laboratory environments requiring precise cobalt analysis.
Principle of the Method The analysis involves dissolving ferro-nickel samples in a mixture of nitric and hydrochloric acids, followed by silicate removal through perchloric acid treatment. Lanthanum solution is added to eliminate spectral interferences. Cobalt concentration is then quantified by measuring absorption at 240.7 nm wavelength using flame atomic absorption spectrometry with an air-acetylene flame.
Reagents and Materials Key reagents include:
- Hydrochloric acid (HCl)
- Nitric acid (HNO₃)
- Perchloric acid (HClO₄)
- Hydrofluoric acid (HF) – with safety precautions due to its corrosive nature
- Lanthanum solution to remove interference
- High-purity nickel and iron powders for calibration
Sampling and Sample Preparation The standard emphasizes proper sampling techniques to avoid contamination and recommends preparing samples as chips, granules, or filings. Samples suspected of oil contamination should be cleaned with acetone. Preparation uses validated acid digestion procedures to ensure complete dissolution and elimination of silica content.
Instrumentation A flame atomic absorption spectrometer equipped with a hollow cathode lamp for cobalt is essential. The instrument settings include a wavelength of 240.7 nm and operation with an air-acetylene flame optimized for a slightly oxidizing, clear flame.
Calibration and Measurement Calibration is performed using cobalt standard solutions prepared with high-purity reagents. The standard describes preparing multiple calibration curves for different cobalt concentration ranges, ensuring accurate quantification across the stated cobalt content spectrum.
Results Expression and Reporting Cobalt content is expressed as mass percentage based on the sample's dry mass. The standard outlines the formula for calculating cobalt concentration in the sample solution and stresses the importance of detailed test reports including method reference, number of measurements, and any anomalies encountered during analysis.

ISO 7520:1985 PDF

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