1 방법 개요
After sample pretreatment, lead ions form a complex with sodium diethyldithiocarbamate (DDTC) under a specific pH condition. The complex is extracted and separated using 4-methyl-2-pentanone (MIBK), then introduced into an atomic absorption spectrometer for flame atomization. Absorbance is measured at a wavelength of 283.3 nm. Within a certain concentration range, the absorbance of lead is proportional to its mass content, and quantification is performed by comparison with a standard series.
2. 적용 범위
This method applies to the determination of lead in sodium pyrophosphate food additive.
3 Reference Standards
GB 25557-2010 National Food Safety Standard – Food Additive Sodium Pyrophosphate, Section A.10 Determination of Lead
4 Instruments, Equipment and Reagents
4.1 기기 및 장비
4.1.1 Analytical Instruments
表格
| 아니야 | 이름 | 수량 | 기술적 요구 사항 | 부속품 |
| 1 | 불꽃 원자 흡수 분광광계는 | 1 세트 | — | 납 빈 阴극 램프 |
| 2 | 공기 압축기 | 1 단위 | 정격 배기 압력: 0.3 MPa | — |
| 3 | Acetylene Cylinder | 1 실린더 | 순수성 ≥ 99.99% | — |
