1 Descripción general del 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 Ámbito de aplicación
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 y reactivos
4.1 Instrumentos y equipos
4.1.1 Testing Instruments
| ¡No! No! | Nombre | Cantidad | Requisito técnico | Accesorios |
|---|---|---|---|---|
| 1 | Espectrofotómetro de absorción atómica de llama | 1 conjunto | — | Calcium Hollow‑Cathode Lamp |
| 2 | Compresor de aire | 1 conjunto | Rated exhaust pressure: 0.3 MPa | — |
| 3 | Acetileno | 1 cilindro | Purity ≥99.99% | — |
