Commonly used pesticides identification method: Visual method of visual inspection of powder pesticides, first look at the appearance of the drug, if it has been significantly damp agglomerate, smell is not strong or other odors, and can be hand-clumped, indicating that the basic failure; emulsion pesticides First, the bottle is allowed to stand still. If the liquid is turbid or delaminated (ie, separation of oil and water), precipitates are born or the floc is suspended, indicating that the drug may have failed. Heating method for powder pesticides. Take 5-10 grams of pesticide and put it on a piece of metal to heat it. If there is a lot of white smoke and there is a strong pungent smell, it means that the medicine is good. Otherwise, it means that it has expired. The flotation method is applied to wettable powder pesticides. Take a cup of 200 g of clean water, and then weigh 1 g of pesticide. Gently and evenly spread it over the surface of the water. Observe it carefully. If it is wet and can sink in water within 1 minute, it is an un-failed pesticide. Otherwise it is a failure pesticide. Suspension suspension method is applied to wettable powder pesticides. Take 30-50 grams of pesticide, place it in a glass container, add a small amount of water to make a paste, then add 150-200 grams, purify the water, and stand for 10 minutes to observe. Among them, the un-failed pesticide has good solubility. The particles suspended in the liquid are fine, the sedimentation speed is slow and the amount of sedimentation is small, and the failure of pesticides is the opposite. Oscillation method for emulsion pesticides. For pesticides with oil and moisture layers, shake the vials vigorously and observe them after standing for 1 hour. If delamination still occurs, it indicates that the chemicals have deteriorated. Hot melt hot melt method for emulsion pesticides. Put pesticides with precipitates into the warm water with a bottle of water (the water temperature should not be too high, suitable for 50 °C -60 °C), after 1 hour observation, if the precipitate slowly dissolves, indicating that the pharmaceutical has not failed, until the precipitate dissolves Afterwards, it can be inherited and reused; if the precipitate is insoluble or insoluble, it means that it has failed and can no longer be used. Dilution dilution method for emulsion pesticides. Take 50 grams of pesticide, place it in a glass bottle, add 150 grams of water, and shake it for 30 minutes. If the liquid is milky white, it will be a failure pesticide, and the more oil in the upper slick will become worse.
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