Nowadays, it's rare to find vegetables that aren't treated with pesticides. Most are sprayed with pesticides during the growing process to prevent pests and diseases. Therefore, it is crucial to wash vegetables before eating them to avoid the harm from pesticide residues.
How to Remove Pesticide Residues from Vegetables
1. Peeling
The surface of vegetables often has a waxy coating that easily absorbs pesticides. Therefore, for vegetables that can be peeled, they should be peeled before consumption.
2. Rinsing with Water
Generally, vegetables should be rinsed with clean water at least 3-6 times, then soaked in light saltwater and rinsed once more.
For vegetables like cabbage, you can first cut them into pieces, soak them in clean water for 1-2 hours, and then rinse with clean water to remove any adhering pesticides.
3. Washing with Alkaline Water
First, add a small spoonful of alkaline powder (anhydrous sodium carbonate) or washing soda (crystalline sodium carbonate) to water, stir well, and then add the vegetables. Soak for 5-6 minutes, discard the alkaline water, and then rinse thoroughly with clean water.
If you don't have alkaline powder or washing soda, you can use baking soda as a substitute, but you should extend the soaking time to about 15 minutes.
4. Washing with Dishwashing Detergent
First, wash the vegetables with a solution of dishwashing detergent diluted 300 times, then rinse 1-2 times with clean water. This can remove bacteria, insect eggs, and residual pesticides from the vegetables.
5. Scalding with Boiling Water
For some vegetables, the best way to remove residual pesticides is to scald them. For example, bell peppers, cauliflower, beans, and celery should be blanched in boiling water before stir-frying or cooking. According to tests, this method can remove over 90% of the residual pesticides.
6. Sun-drying
Utilizing the multi-spectral effect of sunlight can help break down and destroy some pesticide residues in vegetables. After being sun-dried, the vegetables will have fewer pesticide residues.
According to measurements, after fresh vegetables and fruits are exposed to sunlight for 5 minutes, the residue levels of organochlorine and organomercury pesticides can be reduced by 60%.