1 Method Overview
The sample is digested with hydrochloric acid, hydrogen peroxide and nitric acid solution. In dilute hydrochloric acid medium, the absorbance of iron is measured by air‑acetylene flame at the wavelength of 248.3 nm using an atomic absorption spectrometer.
2 Scope of Application
This method is applicable for the determination of iron in zinc alloys.
3 Reference Standard
GB/T 12689.5‑2004 Chemical analysis methods for zinc and zinc alloys — Determination of iron content — Sulfosalicylic acid spectrophotometry and flame atomic absorption spectrometry, Method 2: Flame atomic absorption spectrometry
4 Apparatus and Reagents
4.1 Apparatus and Equipment
4.1.1 Testing Instruments
| No. | Name | Quantity | Technical Requirements | Accessories |
|---|---|---|---|---|
| 1 | Flame atomic absorption spectrophotometer | 1 set | — | Iron hollow‑cathode lamp |
| 2 | Air compressor | 1 set | Rated discharge pressure: 0.3 MPa | — |
| 3 | Acetylene | 1 cylinder | Purity ≥99.99% | — |
