Sister Li, a native of Hefei, bought a handful of green onions at a supermarket in front of her home two days ago. But when she went home and took a closer look, she found that there was something wrong with this onion.
Supermarkets buy "dyed onions"?
Resident Li Dajie told reporters, "That day the child was a little cold, I thought about going downstairs to the supermarket to buy some onions." "The name of this supermarket is Le Du Hui, and Sister Li said that she often goes to buy vegetables." I often go to their house to buy vegetables, usually fish, meat, vegetables and fruits are bought a lot, and the quality of their dishes is OK.
Sister Li said that she bought a handful of green onions that day, and when she returned home, she found a problem when she opened the package to prepare for cleaning.
Sister Li: "I bought more than one piece of money, but I didn't buy much." Then when I got home, I was ready to wash it, and I took the label apart and opened it, and there were obvious blue marks on it. ”
Seeing that the color of the onion was abnormal, Sister Li said that she suddenly remembered one thing, was this the "dyed onion" spread on the Internet? ”
Sister Li: "I was very worried at the time, afraid that it would be the same as buying online." ”
According to relevant media reports, in all parts of the country, some citizens have bought dyed onions.
So what are dyed shallots? Dyed shallots refer to the use of blue alum or Bordeaux liquid in the cultivation and sale of shallots. Blue alum, also known as cholestium, also known as copper sulfate crystal, is an inorganic compound, the main component is copper sulfate pentahydrate, the liquid is blue.
In agriculture, copper-containing substances, including blue alum and Bordeaux liquid, can not only be used as insecticides, but also as fungicides in organic agriculture. The active ingredient of Bordeaux liquid is basic copper sulfate, which can prevent the infection of pathogens, and has the characteristics of wide bactericidal spectrum, long validity period, no antibody production of pathogens, and low toxicity to humans and animals.
Chives contain chlorophyll, and the core of chlorophyll is "porphyrin ring containing magnesium ions"; while magnesium ions are more active, easy to lose, chlorophyll is easy to degrade, and green onion leaves show "withered yellow"; and when copper ions replace magnesium ions into the porphyrin ring, this structure will be very stable, then the chlorophyll dominated by copper ions will show green.
Therefore, Bordeaux liquid not only sterilizes, but also often helps plants protect colors as "color protectors", so that the green onion leaves maintain green for a longer time and improve the appearance of products.
So is dyed onion harmful to the human body? According to the website of the Jiangsu Provincial Center for Disease Control and Prevention, copper is actually an "essential mineral element of the human body", and once the body lacks copper, it is easy to affect health.
But many home-cooked foods contain a certain amount of copper, and enough copper can be obtained in a daily diet, so there is almost no problem of "copper deficiency". The bactericidal factor of Bordeaux liquid is "copper ions", and its potential toxicity is actually copper ions.
Literature reports that the human body's daily intake of copper exceeds 64mg, which is easy to induce copper poisoning, and symptoms such as nausea, nausea, diarrhea, and hematuria appear.
In addition, a research group of China Agricultural University has conducted a "sub-slow toxicity study" on Bordeaux liquid and obtained non-toxic dose data for rats. This data is "multiplied by a 100 times safety factor" to convert to the human body. The conclusion was that an adult weighing 60 kg and a daily intake of no more than 8 mg of copper were safe.
In addition, Bordeaux liquid is suitable for 9 kinds of crops (tomato, citrus tree, cucumber, pepper, potato, apple tree, grape, rice, tobacco), which does not contain onions. That is to say, although there is no health and safety risk, the application of Bordeaux liquid on onions is not allowed.
The reporter secretly visited and found that the chives had blue marks
So, is the situation reflected by Sister Li true? According to the guidance of Sister Li, the reporter found this supermarket called Le Du Hui in the Hefei Municipal Affairs District. The size of this supermarket is not very big, but it is fully stocked.
At the scene, the reporter saw that these chives were turquoise in color and had a good appearance. In the supermarket, the reporter observed it and found no obvious staining marks.
Because the surface of the onion is wrapped in a layer of labels, at the scene, the reporter observes through the naked eye, and there is nothing unusual. Therefore, the reporter decided to buy a handful of green onions in this Le Du Hui supermarket, unpack it and look at it again.
After opening, the label is also normal.
Sister Li: "You have to look at the middle part, that is, the place where the leaves meet the green onion." ”
Reporter: "It is true that in this place where the leaves meet the green onion, we have found some blue traces, not too obvious, do not look carefully can not be seen."
Sister Li said that this is likely to be the traces left after the onion dyeing. "This supermarket is not very obvious now, go to the Jade Garden Vegetable Market to see, there is more obvious."
Subsequently, the reporter came to the Cuiting Garden Vegetable Market in Shushan District, Hefei City.
Reporter: "Where did this onion come from?" ”
Vendor: Where did you get in? It's all local onions
Reporter: "Did you pile it up from Zhou Gu?" ”
Vendor: "It wasn't piled up in Zhougu, it was taken by the farmers themselves." ”
Reporter: "Did the farmers grow it themselves?" ”
Vendor: "Yes." ”
According to the merchant, the onions he sells here are planted by the farmers themselves, and in order to compare the difference between the two kinds of onions, the reporter decided to buy another one.
After the comparison after buying, the reporter found that there are also some blue traces in the place where the leaves and the onion white meet. Compared with the onions in the previous supermarket, this trace is much more obvious.
At the same time, at another stall in the Cuiting Garden Vegetable Market, the reporter found that there were also blue marks in the green onion.
Reporter: "Which onion is this?" ”
Vendor: "Local, shallots are local." ”
Reporter: "Wait, what's the blue on this?" ”
Vendor: "I don't know. ”
Reporter: "Was that what you looked like when you came in?" ”
Vendor: "Right. ”
So are these shallots dyed onions? Subsequently, the reporter took these green onions to the Pen Rack Mountain Office of the Market Supervision and Administration Bureau of Shushan District of Hefei City. In the institute's rapid inspection room, inspectors took some samples for rapid testing.
Inspector: "Because we are inspecting pesticide residues on our side, we can't detect the dyeing, and the pesticide residues are normal at present." ”
Subsequently, the Shushan District Market Supervision and Administration Bureau Bijiashan arranged staff to the scene to conduct a secret visit to sample. After the samples were taken, the staff inspected the other booths.
Inspector Liu Fengxia told reporters that after sampling, the sample onion will be sent to the company for testing.
At present, relevant testing is underway. So, why do the surfaces of these onions have blue marks? The helper girl will continue to pay attention.
Anhui Jingshi reporter reported
Source: Anhui Radio and Television Station