Observation method is suitable for powder pesticides, first look at the appearance of the drug, if it is already damply agglomerated, the smell is not strong or has other odors, and can be handcuffed into a group, indicating that the basic failure; for emulsion pesticides, the first bottle 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 can also be used for the identification of powder pesticides, take pesticides 5 ~ 10 grams, on a piece of metal heating, if there is a lot of white smoke, and there is a strong pungent odor, indicating that the pharmaceutical is good, otherwise, that has expired.

Floating method and suspension method to identify wettable powder pesticides, floating and suspension method can be used, first take a cup of 200 grams of water, then weigh 1 gram of pesticide, gently and evenly sprinkled on the water, observe carefully: wet within 1 minute And can be dissolved in water, indicating that it is not dead pesticides, otherwise it is a failure of pesticides. 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 methods can also use dilution methods to identify 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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