Abstract:

After digestion of food samples with a double-control heating and digestion instrument, an atomic absorption
spectrometer was used to measure the concentrations of various metal elements in the solution, including Cu, Mn, Zn, Fe,
Pb, Cd, and Cr. To verify the scientificalness and reliability of the digestion procedure, analyses were performed on blank
samples. Digestion temperature and time were optimized. Nitric acid recovery and the reliability of the proposed method
were investigated. The results showed that this digestion method had the advantages of low baseline value, high accuracy
and short time of digestion and deacidification, greatly improving the accuracy of analytical results and analysis efficiency.
At the same time, more than 70% of nitric acid could be recovered during the analytical process, reducing air pollution.

Key words: double-control heating and digestion, atomic absorption spectrometer, food, element