1 Yöntem Genel Bakış
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. Uygulama Kapsamı
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 Aletler ve Ekipmanlar
4.1.1 Analytical Instruments
表格
| - Hayır. - Hayır. | İsim | Miktar | Teknik Gereksinimler | Aksesuarlar |
| 1 | Alev Atom Emme Spektrofotometri | 1 set | — | Kurşun Boş Katod Lambası |
| 2 | Hava Kompresörü | 1 birim | Nominal egzoz basıncı: 0.3 MPa | — |
| 3 | Acetylene Cylinder | 1 silindir | Saflık ≥% 99,99 | — |
