recently
Someone rubbed a blue object on the purchased green onion
Can you still eat with confidence?
After testing, Bordeaux liquid was used
Local market supervision departments have also urgently sealed and removed related products
For the most critical issues
How harmful is it to use Bordeaux liquid
That's what the report says
"Excessive intake of copper" can also be harmful to health
How many residues are left after the onions are washed?
How much is the "excessive intake of copper"?
How harmful is "excessive copper intake"?
To answer the above questions
Taizhou Municipal Bureau of Market Supervision arrangement
Staff of Taizhou Food Safety Inspection and Testing Center
Through professional testing equipment
Restore the truth of the event
Click to view the video ↓
1shi real yan test she set ji ji ji 01 experimental preparation
Buy regular chives from the market and configure Bordeaux liquid.
Experiments prepare 02 for the comparative experiment
The chives were divided into 5 groups and performed the following operations: (1) without using Bordeaux liquid (blank control) ;(2) spraying Bordeaux liquid without washing; (3) spraying Bordeaux liquid and rinsing with clean water; (4) soaking Bordeaux liquid without washing; (5) soaking Bordeaux liquid and rinsing with clean water.
03 Detect copper content
The copper content of chives in 5 experimental groups was professionally detected.
2shi real yan test jie fruit
After testing, the copper content of each experimental group is as follows:
3jie fruit lun on shushu
Conclusion 1: Copper sulfate is removed as soon as it is washed
Because copper sulfate is easily soluble in water, from the comparison of groups 2 and 3, 4 and 5 groups, after cleaning, the non-bulk copper content decreased by 95.6% and 97.6%. In other words, even if the public buys "blue onions", after cleaning, most of the copper sulfate will be washed off.
Conclusion two: Eating green onions as rice cannot exceed the limit
Copper is an essential trace element of the human body, and unlike other heavy metals, there is no situation where the copper content in a food is exceeded. At the same time, copper sulfate is also a food processing aid allowed by the state and can be used for the processing of wine and peeled eggs. Referring to the "ws/t 578.3-2017 Chinese residents' dietary nutrient reference intake part 3: trace elements" suggests that the maximum tolerance of copper intake is 8.0mg/day. Assuming that onions are the only source of copper, it can be obtained by substituting the test results into this test: even after soaking the limit residue, after cleaning, a person eating 1.92 kg of "blue onions" a day will exceed the maximum daily resistance limit of copper.
Conclusion three: "Harmful to health" is even more impossible to talk about
As for the media report that "excessive intake will be harmful to health", according to literature, the human body's daily intake of copper exceeding 64mg will cause copper poisoning. We substituted the data in the fifth set of data to obtain, even if the limit residue, a person eating 15.38 kilograms of "blue onion" a day will cause copper poisoning.
Conclusion 4: "Spraying or soaking after picking for good looks" has a low probability
In this group of experiments, we simulated the spraying and soaking of Bordeaux liquid after chives were picked, and the experimental data obtained were 49.57 mg/kg and 135.57 mg/kg. According to the sampling data of 20 batches released by Guizhou Market Supervision in January this year, the copper content of "blue onions" on sale on the market is generally between 1.5-2mg/kg. The copper content left after soaking or spraying chives after cleaning is still higher than that of the "blue onions" sold on the market (still with soil and not cleaned at the time of sale), so the use of Bordeaux liquid in the market is less likely to occur in the transportation and sales links.
(Reference link: "blue chives" is the use of Bordeaux liquid, the risk of harm is very low, the public does not need to talk about "onion" discoloration)
4can refer to kao kao yue reading du reading
Bordeaux liquid, made from a mixture of hydrated lime and copper sulfate solution, is widely used in modern agricultural production as a fungicide for apple trees, grapes and other crops. Because of its low toxicity and low harm to humans and animals, it has been used for more than 130 years. According to media reports, in recent years, Bordeaux liquid has been used on chives because it not only kills bacteria, but also often helps plants protect colors as "color protectors", so that the green onions remain green for a longer time and improve the appearance of products.
However, from the legal and regulatory level, Bordeaux liquid is not a pesticide in the strict sense. The relevant departments did not include it in the supervision of pesticides, did not make clear provisions on the scope of its use and the limit of indicators, and did not take the residue of Bordeaux liquid as a mandatory inspection item for vegetables, melons and fruits. Whether Bordeaux liquid can be used in the chives planting process is uncertain.
Source: Taizhou Traffic Radio