I got an email from friend. It said that we can use baking soda, i.e. sodium bicarbonate, to remove pesticide residue from fruit and vegetable and chlorine residue from tape water.
This method is suggested by Dr. Chen Yaokuan from Chaoyang University of Technology, Taiwan.
Add 1 tablespoon baking soda + suitable amount of water
-> soak fruits and vegetables in it 2-3 minutes
Why baking soda can dechlorinate and remove pesticide? The chemical formula of sodium bicarbonate is NaHCO3. Na+ are positively charged. It will react with negatively charged chlorine into sodium chloride. This is how it can remove chlorine from tap water.
NaHCO3 is weak base and most of the pesticides are acidic, then adding NaHCO3 in water can accelerate the removal of pesticides attached on fruits and vegetables.
They also suggest adding baking soda before boiling vegetables can prevent the loss of chlorophyll and maintain greener color.
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