Pesticide residues washed up? Don't be too superstitious about these so-called high-tech dishwashers.

Pesticide residues washed up? Don't be too superstitious about these so-called high-tech dishwashing machines
fashion rumors
In recent years, fruit and vegetable pesticide residues exceed the standard of the news is common in the press, let people worry about food safety, but also gave birth to fruit and vegetable removal of agricultural residues demand. In this context, under the banner of ozone, ultrasonic, plasma and other high-tech washing machines came into being, and by consumers.
, however, while these high-tech products are selling well, there are also voices of doubt. Can these dishwashers really remove pesticide residues? How do they remove pesticide residues? Will it destroy fruit and vegetable nutrition in the process of removing agricultural residues? To this end, the reporter interviewed experts in related fields.
to the agricultural residue do not superstitious dishwashing machine
reporter inquiry found that the market is now divided into three main types of washing machine: plasma disinfection machine, ozone cleaner and ultrasonic washing machine. It is said that these dishes, which cost nearly a thousand yuan, can not only remove agricultural residues, sterilization, anti-hormones, nutrition preservation, but also remove the long-term hormones in meat, Clener and hookworm virus and seafood products in the antibiotic drug residues.
, however, for the average consumer, it is difficult to tell whether the washing machine is really safe and effective.
"I'm skeptical of the de-agricultural disability of this type of equipment, and from the current scientific evidence, I don't think fruit and vegetable cleaners, fruit and vegetable disinfecters, are an effective device, and while they may play a role in certain situations, they are of little value in general,"
said. Dr. Yun Heartless, a member of the Scientific Squirrel Society, told Science and Technology Daily that neither the washing machine nor the disinfection machine really answered the key question of removing and degrading agricultural residues.
, an associate professor at the School of Food Science and Nutritional Engineering at The Agricultural University of China, holds a similar view. In reality, she says, there are a wide variety of pesticides used, and different pesticides have different principles for fighting pests and diseases. Therefore, only with a function of disinfection machine can not be "one husband when Guan Wanfu Mo open", it is not possible to all fruits and vegetables have an efficient effect to go to the agricultural residues.
and in advertisements for various dishwashers, manufacturers always produce a bunch of "authoritative test reports" and a variety of dazzling experiments. However, this is a gimmick that exploits the lack of expertise of consumers. For example, some manufacturers claim that pesticide degradation rate can reach a very high level, in fact, a specific pesticide added to the water, after treatment to determine the amount of that pesticide, resulting in a high "degradation rate." In fact, this pesticide does not represent the pesticides that may actually exist on fruits and vegetables, and the state of pesticides in water is completely different from that in fruits and vegetables.
at the same time, the current washing machine market is also very chaotic, the size of enterprises vary, product quality is uneven, merchants arbitrarily exaggerate the product function of the phenomenon abounds. Some experts say that the diversity and irregularity of technical schools is a common problem in China's vegetable washing machine industry.
disinfection may be a stinking
ozone cleaner is currently the most common type of dishwashing machine on the market. In fact, ozone is a powerful oxidant that destroys the structure of certain pesticides and degrades them. This kind of cleaning machine in the removal of easily oxidized agricultural residues is relatively effective, but the experiment found that the use of ozone cleaners to remove agricultural residues, not only takes a long time, but also requires a higher ozone concentration. Usually the ozone concentration and action time of household ozone cleaners do not meet the experimental standards. What's more, the hazards of producing small molecules after the degradation of residual pesticides have not been assessed, and the risk of these substances is likely to be higher than that of agricultural residues.
, because of the wide variety of pesticides themselves, ozone is not necessarily effective in removing all agricultural residues, and businesses' advocacy is only specific.
Shiwen, director of the Ozone Professional Committee of the China Federation of Industrial Economics, has also said that the anti-virus principle of ozone cleaners is the use of ozone to break down pesticide components, the effect of ozone production is closely related to the concentration and quality. Experiments have shown that ozone at a concentration of 4 mg/L can remove 60-70% of organophosphorus pesticides in 30 minutes, which requires large ozone instruments rather than household dishwashers. From the current market situation, the ozone cleaner gas production is limited, ozone dissolved in water conversion rate is also very low, the general concentration is only 0.1 mg / liter - 0.2 mg / L, its effect of decomposition of pesticides can be imagined - generally can remove 10%-20% of the surface of fruits and vegetables even good agricultural residues.
addition, ozone treatment may have an impact on the nutritional content of some leafy vegetables. A study by Sun Yat-sen University showed that after treating cabbage with ozone water, total vitamin C loss was nearly 30%.
Plasma is very difficult to get the farm residues away
the use of plasma technology for fruits and vegetables to farm residues, but also a major selling point of business publicity, then, this has the plasma disinfection function of the washing machine how to work?
cloud careless introduction, plasma disinfection is a low-temperature disinfection technology. It uses a plasma-occurring device to separate electrons from the nucleus to present an "ion state". In general, positive and negative charges are equal, so they are called "plasmas". This is another form of matter other than common solids, liquids and gases. Plasma is widely used in modern industry. It has the ability of "low temperature sterilization", in many inconvenient to use high temperature sterilization has been widely used, such as air disinfection, medical equipment sterilization and so on.
theory, it could also be used for fruit and vegetable disinfection. However, the role of this disinfection is to sterilize. "When we clean vegetables and fruits, very few people think about sterilization, the biggest purpose of cleaning is to remove agricultural residues and surface dirt. Plasma disinfection machines do not have an advantage in terms of de-farming and dirt. "Cloud has no mind saying that there are indeed studies on the use of plasma to degrade agricultural residues, but such studies are rare and there is no evidence that plasma is effective in degrading agricultural residues.
for fruits and vegetables, after routine cleaning and proper cooking, bacteria do not pose a health threat, so using plasma equipment to disinfect them is completely unnecessary. What's more, plasma disinfection usually takes tens of minutes, which is completely different from what is commonly referred to as washing dishes and fruit.
is also a problem with ultrasonic cleaning
there is also a type of cleaning high-tech is ultrasonic. In fact, ultrasonic is a kind of mechanical energy, ultrasonic cleaning machine is the use of ultrasonic waves in the water to produce local high pressure to achieve cleaning purposes. "There are some scientific studies that look at ultrasonic degradation, and in some cases ultrasonic cleaners are effective, but there are some problems." Cloud has no heart to say.
Zhu Yi said that the use of ultrasonic cleaning machine to clean fruits and vegetables, if the ultrasonic cleaning machine power is not high, it is not possible to remove pesticide residues on the surface of fruits and vegetables, if the ultrasonic washing machine power is too large, cleaning will destroy fruit and vegetable skin cells, which may lead to agricultural residues into the fruit and vegetable interior, causing greater harm.
In the cloud heartless view, all the dishwashing machine propaganda, is from the rendering of the huge harm of agricultural residues, the first to let consumers set up a "fruit and vegetable farmers are very dangerous" psychological cues. In practice, however, the problem of agricultural disability is overblown. Pesticides are becoming less toxic and residual standards are becoming more stringent. The standard of agricultural residues is already a conservative standard with a large "safety factor".
, pointed out that consumers do not need to be superstitious about all kinds of washing machines on the market. "For the agricultural residues attached to the surface of fruits and vegetables, tap water cleaning, peeling, water, cooking, etc., there is a better removal effect."