Abstract
At present, farmers have to use chemicals to spray crops, vegetables and fruits to eliminate pests can cause toxic residues in vegetables and fruits, especially fruits and vegetables that are sold on the market. Thus the importance of small consumers and conducted experiments to detect toxic substances and heavy metals in vegetables and fruits. Testing can be done with vegetables and fruits bought from the bazaar district Prang not have to wash fruits and vegetables, then cut them into small pieces and thoroughly blended. Juice, water and filtered water volume minus 5 cm into the water, vegetables and fruits. Then take the egg whites to remove the 5 cm into the water, vegetables and fruits. Mix well Observe the precipitation of water, vegetables and fruits are taken to try and change the ratio of juice to the egg white is 5: 3 If a white precipitate formed that contain substances such as heavy metals are
in this experiment were from. Experiment with five kinds of vegetables in order of descending precipitated from the vegetables, beans, kale, Chinese cabbage, Chinese cabbage and other fruits, apples, grapes and guava four species of monkey. Show that a toxin or chemical components.
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