1 Method Overview
The test portion is heated and dissolved in a quartz beaker with mixed sulfuric‑phosphoric acid. After dilution with water, the absorbance of potassium is measured at a wavelength of 766.5 nm on an atomic absorption spectrophotometer using an air‑acetylene flame. Within a certain concentration range, the absorbance of potassium is proportional to its content, and quantification is performed by comparison with the standard series.
2 Scope of Application
This method is applicable to the determination of potassium oxide content in alumina powder.
3 Reference Basis
GB/T 6609.6‑2018, Methods for chemical analysis and physical property testing of alumina — Part 6: Determination of potassium oxide content
4 Instruments and Reagents
4.1 Instruments and Equipment
4.1.1 Testing Instruments
| No. | Name | Quantity | Technical Requirement | Accessories |
|---|---|---|---|---|
| 1 | Atomic Absorption Spectrophotometer (TAS‑990) | 1 set | — | Potassium Hollow‑Cathode Lamp |
| 2 | Air Compressor | 1 set | Rated exhaust pressure: 0.3 MPa | — |
| 3 | Acetylene | 1 cylinder | Purity ≥99.99% | — |
