Formaldehyde is a toxic substance and is prohibited from being used as a food additive. Then we can measure the formaldehyde content in food by this method. This article teaches you to measure the formaldehyde content in water-based foods by acidity meter . Formaldehyde is a toxic substance. China's Food Sanitation Law clearly stipulates that formaldehyde and formaldehyde-containing compounds are prohibited from being used as food additives. However, some illegal traders add formaldehyde to aquatic foods to achieve anti-corrosion and increase the fragility of food, which seriously endangers the health of consumers. Therefore, the method of simple, rapid and accurate determination of formaldehyde content in water-based foods has important food hygiene significance. pHs-3c type PH meter, PH composite electrode; UV-visible spectrophotometer; tissue pulverizer; distillation apparatus. Formaldehyde standard solution: Accurately transfer 2.70mL of 36%-38% formaldehyde solution, and dilute to a formaldehyde concentration of about 1 mg/mL. Then, the exact concentration was calibrated according to 2.1, and the calibration concentration was 962.4 gg/mL. Accurately dilute to the concentration of the formaldehyde solution before use. 1 mol/L Na2SO3 solution: Weigh 31.51g of water Na2SO3, dissolve it with water boiled for 10min and cooled to room temperature, dilute to 250 ml; 0.04129 mol/L standard HCl solution; 0.01% and 0.001% ammonia solution; The above reagents are of analytical grade, and the experimental water is deionized distilled water. JIANGMEN EASY TECHNOLOGY CO.,LTD , https://www.easylife-tech.com