Mr. Liu of Cangzhou, Hebei Province, found that on the oil and wheat vegetables bought from the market, there were many sticky blue particles, which were mixed in the middle of the vegetable leaves and were not easy to find. Although Mr. Liu has washed away the blue particles, he found that this substance cannot be dissolved in water, what is the mysterious blue particles?
In fact, in addition to oil wheat vegetables, many lettuce, spinach, cabbage also have blue particles residues, some people think that this is a new type of pesticide, not easy to clean and will cause harm to the body. It is also believed that this is a residue of the preservative Bordeaux liquid, the main component of which is copper sulfate. What are the facts? Today we will talk about:
Are the blue granules pesticides or preservatives?
In fact, neither is true, some experts said that the blue particles are not ordinary pesticides, the main component is not copper sulfate, but tetraacetaldehyde. It is a highly effective snail killer for snails, slugs and snails, mainly for mollusks.
This substance releases a special aroma that attracts mollusks such as snails and then destroys them. In most people's cognition, only bugs will harm vegetables, in fact, snails, snails are also like to eat vegetable species, their presence will seriously affect the farmers' vegetable yield, so have to use snail killers.
Are snail killers harmful to the human body?
Theoretically, tetraacetaldehyde is a medium-toxic substance that can cause harm to the body if consumed directly by humans, and there is a risk of carcinogenesis from frequent exposure. Generally, eating more than 20g will threaten human life. Eating about 2.5g, there will be different degrees of toxic reactions, such as nausea and vomiting, rapid heartbeat, abdominal pain, etc.
However, we do not have to worry too much, this snailicide generally does not enter the human table, because the country has strict regulations, tetraacetaldehyde can not directly act on crops, can only be used on the ground. In addition, the state has certain safety standards for the residual amount of tetraacetaldehyde, taking oil wheat vegetables as an example, only 0.01 mg can be left in each kilogram of oil wheat vegetables.
That is to say, even if you eat one kilogram of vegetables a day, the amount of tetraacetaldehyde is far lower than the dose of poisoning. So don't be afraid, when you encounter vegetables with blue particles on the roots, you should directly throw away or clean them, this substance is special in color, very easy to distinguish, and try to buy vegetables through regular channels.