Observation method: For powder pesticides, first look at the appearance of the drug, if it is already damply agglomerated, the smell is not strong or there are other odors, and can be handcuffed into groups, indicating that the basic failure; for emulsion pesticides, the bottle is left to stand If the liquid is turbid or delaminated (ie oil-water separation), precipitates are formed or the floc is suspended, indicating that the chemical may have failed.
Heating method: Take 5 to 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 odor, it means that the medicine is good. Otherwise, it means that it has failed.
Floating method: Identification of wettable powder pesticides. Take a cup of 200 grams of clear water and spread 1 gram of pesticide gently and evenly on the surface of the water. Observe carefully: it is wet within 1 minute and can dissolve in water, indicating that it is an un-failed pesticide, otherwise it is a failure pesticide. It is also desirable to take 30-50 grams of pesticide in a glass container, add a small amount of water to make a paste, then add 150-200 grams of fresh water to mix well, and let stand for 10 minutes to observe. The undissolved pesticide has good solubility. The suspended particles are fine, the settling velocity is slow and the amount of sedimentation is small, and the failure pesticide is the opposite.
Dilution method: Identification of 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 homogeneously milky white, and there is no oil on the float, there will be no precipitate. This indicates that the medicine is good, otherwise it is a failure pesticide. , And the more oil on the top, the worse the medicine.
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