Worried about pesticide residues in vegetables and fruits?

Blue Card "Pesticide Residue Rapid Test Card" and "Pesticide Residue Rapid Test Reagent"
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(Pictures are all taken by reporter Li Mengying) Recently, the "2015 Guangdong Agricultural Technology Promotion Award" was announced.
The Dongguan Agricultural Science Research Center's "Key Techniques for Vegetable Quality and Safety Control and the Application of Traceability" won the second prize
.
At present, its project achievement patented product, the blue card "Pesticide Residue Quick Test Card" launched by Dongguan Hengdu Testing Technology Co.
, Ltd.
, is mainly used in the circulation field and basic level testing institutions, the main farmer’s market, agricultural and sideline product wholesale market in Dongguan, It can be seen in large supermarkets
.
The Blue Card "Pesticide Residue Rapid Test Card" is aimed at organophosphorus and carbamate pesticides remaining on the surface of leafy vegetables, melons, fruits and vegetables.
It can effectively detect the residual toxicity of sprays, granules and powders, 15 to Results can be obtained within 30 minutes, combined with auxiliary equipment, ten samples can be sampled at a time
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The staff of Dongguan Hengdu Testing Technology Co.
, Ltd.
told reporters that in summer, the temperature is higher, or the human body temperature close to 38°C can also achieve a good chemical reaction.
Using the coarse screening method, ordinary people can check for pesticide residues at home
.
According to the "coarse screening method", the reporter simulated the home environment and tried the quick test card to test pollution-free vegetables purchased from supermarkets and ordinary vegetables purchased from ordinary farmers' markets.
In order to enhance the experimental effect, the dosage of 2PPM and 5PPM was added to organophosphorus pesticides.
Group, and the pure water group
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Reporter experiment ●Experimental materials: Blue Card "Pesticide Residue Quick Test Card", pollution-free vegetables, ordinary vegetables, 2PPM organic phosphorus, 5PPM organic phosphorus
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●Experimental method: 1.
Take vegetable leaves, drop 2-3 drops of eluent on the surface of the vegetable, and rub another piece of vegetable on the dripping place gently; 2.
Take a quick test card and drop the drop on the vegetable onto the surface of the vegetable.
On the white tablet, let it stand for 10 minutes; 3.
Fold the rapid test card in half and pinch it for 3 minutes to make the red tablet and the white drug overlap to react; 4.
Open the rapid test card, the white tablet turns blue into a normal response.
Turning blue or light blue indicates excessive pesticide residues
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●Experimental results: The white tablets of pollution-free vegetables, common vegetables and purified water groups all appear blue.
In the vegetable group, the color of the pollution-free vegetables group is darker and brighter overall
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The white tablets containing 2PPM organophosphorus are very light in color, while the white tablets containing 5PPM organophosphorus are basically colorless
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Experiments have proved that the quick test card is effective, and there are few pesticide residues in pollution-free vegetables and ordinary vegetables, which meet the national safety standards and can be eaten with confidence
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This cleaning method of linking vegetables and fruits can effectively remove pesticide residues.
Method one is to rinse with running water, rinse several times, rinse off the surface dirt, remove the visible stains, and then cover the fruits and vegetables with clean water about 5 cm, running water Soak for no less than 30 minutes
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Different water is suitable for washing different vegetables and for different residual pesticides
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1.
Light brine
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Using light salt water to wash vegetables can dissolve formaldehyde and pesticide residues.
Compared with clear water, light salt water itself has a sterilizing effect
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The concentration of dilute salt water should be similar to the concentration of dilute salt water used for gargle
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Regarding the length of time for washing vegetables, you can soak them in light salt water for 3-5 minutes, and then rinse them with clean water
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2.
Wash rice water
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Rice washing water is alkaline, which can reduce harmful substances in vegetables, but the water that has just washed rice is not very alkaline, and the effect of washing vegetables after fermentation will be better
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In addition, the rice water itself has a certain viscosity, which can absorb some pesticides and chemical substances attached to the surface of the food
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3.
Flour water
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Compared with rice water, flour water has slightly lower alkalinity and lower ability to decompose pesticide residues, especially for the decomposition of phosphorus-containing pesticides, while rice water can usually hydrolyze some phosphorus-containing pesticides to reduce their toxicity
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4.
Fruit and vegetable cleaning agent
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If the quality of the cleaning agent can be guaranteed, the cleaning effect will generally be better than that of rice water
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However, it should be noted that some fruit and vegetable cleaning agents contain chemical components, and sometimes their safety is relatively poor
.
5.
Alkaline water
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Most organophosphorus pesticides can quickly decompose in an alkaline environment, so the method of soaking in alkaline water is one of the effective methods to remove pesticide residues from vegetables and fruits.

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