Abstract
Sodium nitrite has been widely used as food additives in food processing for a long time. With the improvement of people's living standards and the frequent occurrence of sodium nitrite food safety accidents, the safety of sodium nitrite residues in food has attracted much attention. Therefore, the design of a simple, accurate and reliable sodium nitrite detector can greatly avoid the occurrence of food poisoning events. In order to solve the problems caused by sodium nitrite, we design and realize a nitrite concentration detection system based on spectrophotometry. By detecting the concentration of sodium nitrite, we can better judge the harm degree of sodium nitrite in food. Firstly, the principle of Spectrophotometric Determination of sodium nitrite is introduced. Then, according to the advantages of embedded technology in instrument control, we use embedded controller STM32 to design the hardware circuit and software program of the system. Finally, the curve equation is obtained by the standard solution experimental data, which can be used to measure the concentration of sodium nitrite in samples. The experimental results show that the system does not exceed 5% error in measuring the concentration of nitrite in sample solution, which meets the requirements of the national food arrangement detector. The design has the advantages of simple operation, low power consumption, high accuracy, and reliability, and it has good application value.
