1 Method Overview
The sample is heated and dissolved in a quartz beaker with mixed sulfuric phosphoric acid. Using an air acetylene flame, the absorbance of sodium oxide is measured at 589.0 nm on an atomic absorption spectrophotometer. Within a certain concentration range, the absorbance of sodium is proportional to its content, and quantification is carried out by comparison with the standard series.
2 Scope of Application
This method is applicable to the determination of sodium oxide content in alumina powder.
3 Reference Basis
GB/T 6609.5-2004, Methods for chemical analysis and physical property testing of alumina — Determination of sodium oxide content, Method 2
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 | — | Sodium Hollow-Cathode Lamp |
| 2 | Air Compressor | 1 set | Rated exhaust pressure: 0.3 MPa | — |
| 3 | Acetylene | 1 cylinder | Purity ≥99.99% | — |
