1 Method Summary
After sample digestion, the test solution is atomized in air flame, and absorbance is measured at the wavelength of 766.5 nm. Within a certain concentration range, absorbance is proportional to potassium content, and quantification is completed by comparison with standard calibration series.
2 Scope of Application
This method is applicable to the determination of potassium in sweet potato products.
3 Reference Standard
GB 5009.91-2017 National Food Safety Standard – Determination of Potassium in Foods
4 Testing Instruments
· Flame Atomic Absorption Spectrophotometer 1 unit – Potassium hollow cathode lamp
· Air Compressor 1 unit Rated exhaust pressure: 0.3 MPa
