Formalin is a 35% to 40% aqueous formaldehyde solution, which has the functions of antisepsis, disinfection and bleaching. Different fields have different functions. Among them, formaldehyde can combine with amino groups in protein to solidify protein. Therefore, it can be used as tissue fixative and preservative in medicine, and is often used by unscrupulous merchants for aquatic product processing.

Toxicity of formalin:

Formaldehyde can combine with NH2 group in protein to form formyl protein, and its reaction speed is significantly affected by pH value and temperature. Gaseous formaldehyde has a strong stimulating effect on mucosa. Formaldehyde aqueous solution can denature protein and is widely used as a bactericide. In animal experiments, the oral LD50 of rats is 800 mg/kg, and that of guinea pigs is 240 mg/kg.

Formalin initially stimulates the eye mucosa at a low concentration, and slightly stimulates the upper respiratory tract at a high concentration, causing cough and chest tightness. At the same time, there is a special feeling of oppression on the forehead, which causes mucosal ulceration and then lung inflammation. Inhalation of formaldehyde can cause anorexia, anorexia, emaciation, weakness and insomnia; Frequent contact may cause allergies. And can cause skin tissue ulcer. Formaldehyde has an anesthetic effect on the central nervous system.

The above contents refer to Baidu Encyclopedia-Formaldehyde? Baidu encyclopedia-formalin