CCTV exposure: chemical waste barrels 'turned into' iron pots, heavy metals exceed the standard, how to identify poisonous iron pots?
Chemical waste barrels "turned into" iron pots, heavy metals exceeding the standard, causing serious harm.
This is a real incident that has been exposed by CCTV. The reporter found a lot of iron pots without quality inspection marks in a hardware wholesale market, and the price is only 10 yuan.
After learning about it, the reporter drove to Fenglingtou Town, the hometown of "small hardware". On the way, he saw piles of waste chemical barrels , and the air was filled with a pungent smell. The iron drums were printed with chemical names such as trimethylchlorosilane, isopropanol, and dichloromethane, and some were even marked with skulls (including highly toxic).
The reporter randomly selected a scrap iron processing plant , and workers were cutting the scrap iron barrels into round iron sheets.
After talking with the workers, I found that the production process of the wok is complicated and requires multiple processing procedures.
Among them, burning is a very important step, which can help to remove the odor irritated by iron sheets ; after that, it has to be soaked in a sulfuric acid pool for 2 hours to remove rust and other dirt.
Finally, soaked in hydrochloric acid, plus polishing, oiling and other processes, a brand new iron pot is formed.
The reporter then sent these iron pots to the testing center, and finally found that the heavy metal lead was high. If lead intake exceeds the standard, it can cause damage to many systems such as human breathing, digestion, nerves, endocrine, etc., and has a huge impact on human health.
Pictures People's Daily
As a daily necessities, pots will inevitably come into contact with each other. How to choose a safe pot at this time?
01. Iron pan, stainless steel pan, non-stick pan, aluminum pan, which pan is safer?
Due to different materials, the types of pots are also different, such as iron pots, stainless steel pots, non-stick pots, aluminum pots, etc. What are the advantages and disadvantages of each?
·Wok
At present, the iron pots on the market are mainly divided into two types: cast iron pots and wrought iron pots. The former has a thick bottom and a thin wall, is heated more evenly, and has a fast heating speed, which is suitable for cooking.
But it is thick and easy to rust . And if the human body absorbs too much iron oxide, that is, rust, it may threaten the health of the liver;
The latter has better thermal conductivity, it is not easy to stick to the pan, and the whole is relatively light and thin, but because the heat transfer is too fast, the heat is not easy to control.
There are rumors that this kind of pot can "dissolve" iron when cooking, and if you eat too much, you can supplement iron. But in fact, the iron content "dissolved" from the iron pot is not only very small, but also difficult to be absorbed by the human body, so it is not feasible to use the iron pot to supplement iron.
·Aluminum pot
The production process of this kind of pot is relatively simple, the weight is light, and the price is relatively cheap . However, if the intake of aluminum exceeds the standard, it may affect the health of human nerves and bones, especially when cooking acidic food with it, the content of aluminum melted will be higher, so pay attention to avoid cooking acidic food with aluminum pot.
As for the rumor that it may cause Alzheimer's disease, don't take it too seriously. The Joint Expert Committee on Food Additives of the World Health Organization has made it clear that according to the current research, it is impossible to prove that aluminum can cause Alzheimer's disease.
·stainless steel pot
A kind of pot that many people prefer. Its material has the characteristics of high strength, durability and corrosion resistance . It is beautiful, durable and easy to clean, but the price is higher than other pots .
However, there are also negative rumors about the rich second generation of stainless steel pots in the "pot world". There are rumors that it can precipitate heavy metals such as manganese, chromium, nickel, and titanium during the cooking process, which may cause Parkinson's disease.
In fact, as long as it is a qualified product purchased in a regular shopping mall, the content of its heavy metal precipitation is generally controlled within the safe range of national health standards, so don't worry too much.
·Non-stick pan
This kind of pot is also a popular one, featuring "non-stick cooking", mainly because a coating called Teflon is added to the surface , which has the characteristics of high temperature resistance, low temperature resistance, self-lubrication, chemical stability, etc. , so it is not easy to stick to the pan and easy to clean.
However, when this kind of pot is used, it is easy to be "scratched" by sharp objects such as steel spatula and steel ball, which causes the coating to be damaged or peeled off, which affects the feeling of use.
As for nonstick pans, rumor has it that when heated, it releases toxic substances that are bad for your health. In fact, Teflon coating is very resistant to high temperature. As long as the heating temperature does not exceed 500 °C, its coating structure is relatively stable.
So, don't worry too much. However, when cleaning, it is best to use a soft sponge to prevent the coating from being damaged or peeled off.
It can be seen from the above that each pot has its advantages and disadvantages, but as long as it is a product of qualified quality, it is safe. As for which one to choose, you can choose according to your own preferences and needs.
02. How to identify poisonous iron pots?
Let's return to the topic of iron pots. Many people have iron pots at home, so how should we avoid poisonous iron pots?
Choose regular channels , buy regular products , don't buy iron pots with too low prices and no quality inspection marks, and don't buy from stalls and hawkers without business qualifications.
Since the iron pot is easy to rust, in order to avoid rust, the merchant will carry out a certain anti-rust treatment , that is, spray anti-rust treatment agent, so it often has a special smell, so the new pot needs to be deodorized.
The method is very simple. Add some water, cooking oil, and tea leaves to the pot. After it is boiled, take a spoon and drizzle it all over the pot wall, then brush it with a brush, and finally rinse it with hot water. After the completion, you can use a piece of fat to brush back and forth in the pot to remove the flavor and prevent the iron pot from rusting.
3. One look and two listen
Look, mainly to see whether the surface of the pot is smooth and whether the thickness is uniform. If there are obvious small pits, the quality is not good. Listen, it mainly means that when buying a pot, you can turn the pot over and hit it with something. If the sound is loud and the hand vibrates, it means that the quality of the pot is good.
Summary: In short, when buying pots, try to choose products with excellent brands and excellent craftsmanship. As for some rumors about the pot on the Internet, many of them are not true, so please don't spread these rumors. Generally speaking, as long as the products are of qualified quality, they are safe and can be used with confidence.
References:
[1] "CCTV Exposure! Don't use this to cook anymore, look at what you have at home and throw it away". News Square. 2019-06-03
[2] "Iron pan, frying pan, non-stick pan, which pan is the best for cooking? 》. Tencent Medical Code. 2021-07-01
[3] "Select the best iron pot for iron supplement". Health Times reporter. 2006-07-27
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