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Heating method can also be used for the identification of powder pesticides. Take 5-10 grams of pesticides and heat them on a piece of metal. If a large amount of white smoke is produced, and there is a strong pungent smell, it means that the medicine is good. Otherwise, it means that it has failed.
The floating method and the suspension method are used to identify the wettable powder pesticide. The floating method and the suspension method can be used. First, take a cup of 200g of water, then weigh 1g of pesticide, gently and evenly spread on the water surface, carefully observe: wet in 1 minute It can be dissolved in water, indicating that it is a pesticide that has not expired, otherwise it is a failed pesticide. It is also possible to take 30-50 grams of pesticides, put them in a glass container, first add a small amount of water to make a paste, then add 150-200 grams of water to mix well, and let stand for 10 minutes to observe, wherein the pesticides that have not failed are well soluble, the liquid The suspended particles in the medium are fine, the sedimentation rate is slow and the amount of sedimentation is small, and the pesticide is reversed.
Dilution method The dilution method can also be used to identify emulsion pesticides. Take 50 grams of pesticide, put it in a glass bottle, add 150 grams of water, shake it vigorously and let it stand for 30 minutes. If the liquid is uniform milky white, and there is no oil on the oil, there is no precipitation, indicating that the agent is good, otherwise it is a pesticide. And the more the upper layer of oil, the worse the drug.
Judging the failure of pesticides
The observation method is applicable to powder pesticides. First, look at the appearance of the medicine. If it has been obviously agglomerated by moisture, the taste of the medicine is not strong or has other odors, and it can be formed into a group by hand, indicating that it has basically failed; for the emulsion pesticide, the medicine bottle is first set to stand. If the liquid is turbid or stratified (ie, oil-water separation), there is sediment formation or flocculation, indicating that the agent may have failed.
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