Zhixiang laboratory, ozone washing machine to remove pesticides: is it really effective, or is it rumored?

As the temperature rises day by day, fresh fruits and vegetables are gradually on the market. But what is worrying is that although fruits and vegetables are delicious, pesticides are difficult to wash.

Ozone washing machine

Ozone is produced by ionization, and the strong oxidation ability of ozone is used to make ozone react with pesticides, fertilizers and additives, making it detached from the surface of fruits and vegetables, so as to achieve the purpose of cleaning fruits and vegetables.

In most cases, this product is sold by salespeople in the community to aunts and aunts who like to keep in good health. It is said that some uncles and aunts even regard the ozone vegetable washer as a treasure and use it every time they wash vegetables. After a long time, they don't eat out and feel that the dishes outside are not clean.

Is the ozone vegetable washer really that magical? What is its effect on the removal of pesticides? Today, Zhi Hengjun will tell you with an experiment.

1. Experimental materials

The ozone machine used in the experiment is a product promoted by the co-workers in the community. You know the purchasing power of the aunts. The salesman kindly called auntie, coupled with high-tech terms such as ozone sterilization, and the aunts could no longer contain their enthusiasm for consumption. After that, there was such an ozone washing machine in the kitchen of the colleague.

Ozone washing machine

Zhi Hengjun searched the Internet and found that the most pesticide residues were cucumbers, strawberries and green leafy vegetables, so Zhi Hengjun took her sister to the market to buy some cucumbers, strawberries and rape.

Considering the common way of washing vegetables, Zhi Hengjun also bought detergent to compare the pesticide residue results of unwashed, water soaked, ozone washer and detergent.

For pesticide testing, Zhi Hengjun bought the best-selling pesticide rapid test card on a treasure, which is easy to operate and can detect whether the pesticide exceeds the standard in 3 minutes.

Pesticide rapid test card

Application method of Pesticide Quick Test Card

two。 Experimental process

In the course of the experiment, we first tested the pesticide residues of fruits and vegetables in the uncleaned state, and then tested the pesticide residues after soaking in clean water, after washing with ozone washing machine and after washing.

Soak in water for 15 minutes:

Wash in the ozone washing machine for 15 minutes:

Cucumber is washed in ozone washing machine.

Strawberries are washed in an ozone washer

Rape is washed in ozone washing machine.

Warm reminder: the smell of ozone is so pungent that it almost smokes Zhi Hengjun and Zhi Heng sister out of work injury.

Soak in detergent solution for 15 minutes:

3. Experimental results

This experiment belongs to the reference comparison experiment, so it is necessary to use pure water to make a blank control card, and the white tablets become sky blue to indicate that there are no pesticide residues. In the test, the color of the white tablet is closer to the sky blue, indicating that the less pesticide residue, on the contrary, the lighter the color of the white tablet, the more pesticide residue.

Blank control card

Generally speaking, among the three kinds of fruits and vegetables, cucumber has the most pesticide residues, followed by strawberry, and rape has the least pesticide residues.

In the cleaning comparison of cucumbers, the removal effect of pesticides by ozone washing machine is the most obvious, followed by soaking in clean water. This shows that the ozone washing machine can remove part of the pesticide residues.

In the comparison of strawberry cleaning, the effect of detergent on pesticide removal is the best, followed by water immersion, while the performance of ozone vegetable washer is not obvious, the removal of pesticides is very little.

In the comparison of rape cleaning, because there are not many pesticide residues in rape itself, the removal effects of the three cleaning methods are not obvious, which is incomparable.

Why is the ozone washing machine the best for removing pesticide residues on cucumbers?

After consulting the data, Zhi Hengjun finally found the answer. The pesticide rapid test card we bought can only detect several common pesticides, including methamidophos and dimethoate, which are often sprayed on cucumbers. But for strawberries, the pesticides that are often sprayed are not these, but some fungicides, so the effect of this experiment on the removal of pesticide residues on strawberries is not obvious.

According to the cucumber experiment, the ozone washing machine can remove the pesticide residues on the surface of fruits and vegetables to a certain extent, but the removal rate needs to be quantitatively analyzed in the chemical laboratory.

In fact, from the experimental results, the effect of removing pesticides by soaking in clear water is not bad, this is because 2/3 of the pesticides are soluble in water, and some pesticides can also be removed by water cleaning. Therefore, we should not blindly rely on the ozone vegetable washer. In addition, Zhi Hengjun would like to remind you that the ozone vegetable washer is powerless for the deep harmful substances, and the ozone detoxification machines on the market that claim to remove hormones from meat are basically false propaganda.

Finally, Zhi Hengjun would also like to remind everyone that when using the ozone washing machine, you must maintain the ventilation of the surrounding environment, because the ozone washing machine will release ozone when it works, and it will be filled with pungent ozone. If people inhale too much ozone for a long time, there is a risk of lung disease.