1 Resumo do Método
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. Âmbito de aplicação
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 Instrumentos e equipamento
4.1.1 Analytical Instruments
表格
| Não. | Nome | Quantidade | Requisitos Técnicos | Acessórios |
| 1 | Espetrofotometro de Absorção Atômica de Flame | 1 conjunto | — | Lead Hollow Cathode Lamp |
| 2 | Compressor de ar | 1 unidade | Pressão de escape estimada: 0,3 MPa | — |
| 3 | Acetylene Cylinder | 1 cilindro | Pureza ≥ 99,99% | — |
