1. Method Overview
After sample digestion treatment, the sample is atomized in a graphite furnace, and the absorbance is measured at 357.9 nm. Within a certain concentration range, the absorbance of chromium is proportional to its content, and quantification is performed by comparison with the standard series.
2. Scope of Application
This method applies to sulfur used for various phosphors in the manufacture of television picture tubes and other cathode‑ray tubes in the electronics industry.
3. Reference Basis
ZB G13 002‑1990, Refined Sulfur Powder
4. Instruments and Reagents
4.1.1 Testing Instruments
| No. | Name | Quantity | Technical Requirement | Accessories |
|---|---|---|---|---|
| 1 | Graphite Furnace Atomic Absorption Spectrophotometer | 1 set | — | Chromium Hollow‑Cathode Lamp |
| 2 | Circulating Water Cooling System | 1 set | — | — |
| 3 | Argon | 1 cylinder | Purity ≥99.99% | — |
