How to identify whether the stored and purchased pesticides are invalid, the pesticide network Xiaobian provides the following methods, very simple and practical.
Observing method for identification of dairy pesticides, it was found that there were sedimentation and stratified flocculation in the pesticide. The bottle could be placed in hot water and allowed to stand for 1 hour. If the sediment decomposed, the floc disappeared, indicating that the pesticide was effective; otherwise Can not be used by craftsmen. Shaking method, stratification phenomenon occurs in the pesticide bottle, the lower layer of the upper layer of oil slicks, the medicine bottle can be shaken to make the pesticide uniform, and then allowed to stand for 1 hour. If it is still layered, it proves that the pesticide has deteriorated. If the layering disappears, it means that it has not expired and can be used.
Powder pesticide identification method:
Suspension method: take 50 grams of powder pesticide, put it in a glass bottle, add a little water to make a paste, add appropriate amount of water and mix well, place for 10-20 minutes, good pesticide powder is fine, less and the precipitation is slow; Pesticide powders precipitate quickly and often.
Cauterization method: Take 10-20 grams of powder pesticide, put it on a metal sheet and put it on fire. If it is white smoke, it proves that the pesticide has not failed, otherwise it means it has failed. Observation method: If the powder pesticide has been agglomerated, it is not easy to be broken, and it proves to be invalid and can no longer be used.
Wettable powder pesticide identification method Take a cup of water and gently sprinkle a little pesticide on the water. After 1 minute, if the pesticide can not be dissolved in the water, it has deteriorated. In addition, the China Pesticide Network prompts that 1 gram of pesticide is sprinkled into a glass of water and stirred thoroughly. If precipitation occurs quickly, the liquid surface appears translucent, indicating that the pesticide has failed.
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