1 Tổng quan phương pháp
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. Phạm vi áp dụng
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. Dụng cụ và hóa chất
4.1 Dụng cụ và thiết bị
4.1.1 Testing Instruments
| Không. | Tên | Số lượng | Yêu cầu kỹ thuật | Phụ kiện |
|---|---|---|---|---|
| 1 | Máy quang phổ hấp thụ nguyên tử ngọn lửa | 1 bộ | — | Calcium Hollow‑Cathode Lamp |
| 2 | Máy nén khí | 1 bộ | Rated exhaust pressure: 0.3 MPa | — |
| 3 | Acetylen | 1 xi lanh | Purity ≥99.99% | — |
