1 Resumo do Método
After the sample is digested, lanthanum solution is added as a releasing agent. The sample is atomized in an atomic‑absorption flame, and the absorbance is measured at 422.7 nm. Within a certain concentration range, the absorbance is proportional to the calcium content, and quantification is performed by comparison with the standard series.
2. Âmbito de aplicação
This method is applicable to the determination of calcium in milk powder.
3 Reference Basis
GB 5009.92‑2016, National Food Safety Standard — Determination of Calcium in Foods
4 Instrumentos e Reagentes
4.1 Instrumentos e equipamento
4.1.1 Testing Instruments
| Não. | Nome | Quantidade | Requisitos técnicos | Acessórios |
|---|---|---|---|---|
| 1 | Espetrofotometro de Absorção Atômica de Flame | 1 conjunto | — | Calcium Hollow‑Cathode Lamp |
| 2 | Compressor de ar | 1 conjunto | Rated exhaust pressure: 0.3 MPa | — |
| 3 | Acetileno | 1 cilindro | Purity ≥99.99% | — |
