1 方法概要
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 適用範囲
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計器設備
4.1.1 Analytical Instruments
表格
| いや | 名前 | 量 | 技術要件 | アクセサリー |
| 1 | 火焰 原子 吸収 分光 光計 | 1セット | — | リード中空陰極ランプ |
| 2 | 空気圧縮機 | 1ユニット | 評価された排気圧: 0.3 MPa | — |
| 3 | Acetylene Cylinder | 1つのシリンダー | 純度 ≥ 99.99% | — |
