With the development of science and technology, many agricultural products are planted with some high-tech, and many agricultural products will be sprayed with some pesticides, and some vegetable farmers will keep the cabbage fresh to prevent the cabbage from heating, red root and rotting two or three days after being piled together in long-distance transportation. Therefore, they will be sprayed with formaldehyde. So, how can we tell if the cabbage is sprayed with formaldehyde.
Formaldehyde may cause liver coma. Experts say that only long-distance transportation of spring cabbage can spray preservatives. Other fruits and vegetables on the market have not been found or heard of formaldehyde preservation.
How to distinguish whether the cabbage is sprayed with formaldehyde? Generally speaking, the fresh-keeping measures for the transportation of spring cabbage are mainly cold storage, that is, mechanical refrigeration in the refrigerator or putting ice into the box. However, for the sake of economy, some illegal traders use the bad method of spraying formaldehyde. Experts said that formaldehyde does have antiseptic effect. It can be used to soak seeds in agriculture and disinfect seeds. The concentration is only 0.1% - 0.5%. However, it has never been heard that formaldehyde can be used to spray mature cabbage.
Under normal conditions, formaldehyde is a gas, soluble in water, with a concentration of 35% - 40% formaldehyde aqueous solution, which is often referred to as formalin solution.
Formaldehyde, a colorless irritant gas with strong smell, can cause damage to human skin, respiratory tract and internal organs. It anesthetizes the central nervous system of human. After inhalation of high concentration formaldehyde, it will cause serious irritation to respiratory tract, cause edema, eye tingling, headache, etc., and also produce bronchial asthma, or cause pulmonary edema, liver coma, renal failure, etc. According to the World Health Organization, formaldehyde will cause deformity, tumor growth, and long-term exposure will also lead to gene mutation.
In order to remove formaldehyde, it is necessary to thoroughly test the pesticide residues in the large-scale agricultural trade market at present, but there is no hard index for formaldehyde detection. It is suggested that attention should be paid when purchasing and selecting Chinese cabbage: the Chinese cabbage sprayed with formaldehyde will have obvious pungent and hot eyes; the Chinese cabbage has been placed for a long time and cut vertically from the middle. If it is found that it is rotten inside and not rotten outside, it may have been sprayed with formaldehyde solution.
If you buy a cabbage sprayed with formaldehyde, you can throw away the outer layers of cabbage leaves, and then remove more parts of the cabbage top. The rest is soaked in water for a while, because formaldehyde itself dissolves in water, soaks in water, and then rinses with live water, it is possible to dilute the formaldehyde.