Yam spray formaldehyde preservative merchants can guarantee that not bad for four months.
Qilu network in May 7th, according to Shandong radio and television television life channel "Life Gang" report, recently some netizens bought yam home, found that yam was sprinkled like water, reporters after investigation, wholesale merchants of yam merchants Said, because the weather is too high temperature, afraid of yam rotting, so they used this method of soil, their own preparation of Formaldehyde Solution to keep fresh, then how do they come to spray it? Then look at the reporter's latest investigation today.
yam spray formaldehyde to fresh-keeping the merchants to keep the reporters say
in order to further investigate the inside of the yam spray, the reporter came to the large wholesale vegetable market in Ji'nan again. Similarly, the citizens who bought the yam here are not the few, most of them are the hotel purchase. Clerk. It happened that when she arrived at the merchant who sold the yam to the reporter, she was spraying the yam with a watering pot.
the merchants who are spraying Formaldehyde Solution on the yam say that the surface of the yam has begun to dry slowly, and some places have been rotting, so it is necessary to spray the preservative in time. As to how much time it is sprayed once, the merchants say they have to be sprayed as long as they are not sold out.
it is understood that the harvest festival of yam is after autumn, the temperature is low, many yam will be sold in winter, so it is difficult to save the yam. Subsequently, the reporter bought dozens of Jin Chinese yam, because the fear will soon rot, the reporter asked businessmen to spray some Formaldehyde Solution.
but the merchant said, this thing is not random spray, if found, it will be troublesome. Although the merchant said that the yam sold to reporters could be guaranteed for four months, she was still a little worried and offered to give the reporter a new Formaldehyde Solution once again. In the
survey, merchants say that they are often sprinkled from time to time because they are wholesale yams, but if they sell well and sell them out a day, they don't have to spray again. In order to grasp the evidence, the reporter asked the merchant for her prepared Formaldehyde Solution. Businessmen reminded several times that Formaldehyde Solution, who poured it to reporters, must pay attention to it.
a few days still have formalin seriously causing toxic shock
, this treated yam, after a few days after placement, attached to the surface of the yam on the spray of Formaldehyde Solution, can formaldehyde be volatile? Can this yam also have formaldehyde?
three days after the purchase of the sample, the reporter took the yam that was bought from the wholesale market, and came to Shandong Light Industries College to find Professor Du of the school of chemical and pharmaceutical engineering. It was ready to test it through the experiment to see whether the purchased yam contained formaldehyde.
first, Professor Du first peeled the medicine bought by reporters and put it in distilled water for soaking. After about 20 minutes, Professor Du took the soaking solution and then added acetacetone and 20% ammonium acetate to mix. And put it on the stove for heating, just after a while, the original milky white soak turned yellow. Professor Du told reporters that the more yellow the color, the more formaldehyde content.
Professor Du said,.Quot; compared with the previous one, it was milky white, and the formaldehyde reagent turned yellow, indicating that the surface of the yam was also formaldehyde. .quot;
by contrast, the color of the soak has changed obviously, Professor Du said that formaldehyde itself is volatile, after several days of placement of the yam, the formaldehyde attached to the surface has evaporated part of. Therefore, the content of formaldehyde on the surface of yam is not very large.
Professor Du said,.Quot; the longer the time the longer the content is, the more we wash it, it will dissolve in the water, so after buying it, we can try to wash it as much as possible to reduce the harm. .quot,
later, Professor Du also tested formaldehyde in the potion of wholesale yam for preservation. In the same way, after taking the medicine, mix it with acetyl acetone and 20% ammonium acetate solution, then put it on the stove to heat.
experimental results showed that the original colorless soaking solution has now become bright yellow, and it contains a lot of formaldehyde.
Professor Du said,.Quot; formaldehyde intake of the human body, can cause the symptoms of formaldehyde poisoning, light dizziness and weakness, visual loss and so on, severe shock, after the occurrence of this formaldehyde poisoning, can immediately drink water or milk, and then to the nearby hospital for treatment. .quot;
through the investigation and several experiments proved that in order to inhibit the decay and germination of vegetables, Chinese cabbage and yam have used Formaldehyde Solution to keep fresh. Obviously, the fresh-keeping link has become a heavy disaster area for the abuse of formaldehyde. In the vegetable wholesale market, there is a vegetable dealer that the use of preservative is almost a latent rule in the industry. Some preservatives are scientifically developed, biologically refined, and the preservatives are chemical. According to his understanding, the use of soil methods to make up Formaldehyde Solution for spraying fresh-keeping is the vast majority.
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