First, the intuitive method: for powder pesticides, first look at the appearance of the drug, if it is obviously damp and agglomerate, the taste of the drug is not strong or have other odors, and can be smashed into a group by hand, these drugs are basically invalid; for the emulsion pesticide, first the bottle After standing, if the liquid is turbid or stratified (ie, oil-water separation), precipitates are formed or flocs are suspended, and the agent has failed.
Second, heating method: suitable for 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, the description has expired.
Third, the floating method: suitable for wettable powder pesticides. First take 200 grams of water, then weigh 1 gram of pesticide, gently and evenly spread on the water, carefully observed. A pesticide that is wet and soluble in water within 1 minute is a non-failed pesticide, otherwise it is a failed pesticide.
Fourth, suspension method: suitable for wettable powder pesticides. Take 30-50 grams of pesticide, put it in a glass container, first add a small amount of water to make a paste, then add 150-200 grams of water and mix well, let stand for 10 minutes to observe, the pesticide is not dissolved, the liquid is suspended. The powder is fine, the sedimentation rate is slow and the amount of sedimentation is small, and the pesticide is reversed.
V. Oscillation method: suitable for emulsion pesticides. For pesticides with oily water layer, first shake the vial with force and let it stand for 1 hour. If stratification still occurs, the agent has deteriorated.
Sixth, hot solution method: suitable for emulsion pesticides. Put the pesticide with precipitate into the bottle and put it into warm water (the water temperature should not be too high, preferably 50-60 °C). After 1 hour, if the precipitate dissolves, it means that the agent has not expired. After the sediment is dissolved, it can continue. Reuse; if the precipitate is difficult to dissolve or dissolve, it has failed.
7. Dilution method: suitable for 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 drug solution is uniform milky white and there is no oil slick on it, there is no precipitation under it, indicating that the drug is good. Otherwise, it is a failed pesticide. The more the upper layer of oil slick, the worse the medicinal properties.
Second, heating method: suitable for 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, the description has expired.
Third, the floating method: suitable for wettable powder pesticides. First take 200 grams of water, then weigh 1 gram of pesticide, gently and evenly spread on the water, carefully observed. A pesticide that is wet and soluble in water within 1 minute is a non-failed pesticide, otherwise it is a failed pesticide.
Fourth, suspension method: suitable for wettable powder pesticides. Take 30-50 grams of pesticide, put it in a glass container, first add a small amount of water to make a paste, then add 150-200 grams of water and mix well, let stand for 10 minutes to observe, the pesticide is not dissolved, the liquid is suspended. The powder is fine, the sedimentation rate is slow and the amount of sedimentation is small, and the pesticide is reversed.
V. Oscillation method: suitable for emulsion pesticides. For pesticides with oily water layer, first shake the vial with force and let it stand for 1 hour. If stratification still occurs, the agent has deteriorated.
Sixth, hot solution method: suitable for emulsion pesticides. Put the pesticide with precipitate into the bottle and put it into warm water (the water temperature should not be too high, preferably 50-60 °C). After 1 hour, if the precipitate dissolves, it means that the agent has not expired. After the sediment is dissolved, it can continue. Reuse; if the precipitate is difficult to dissolve or dissolve, it has failed.
7. Dilution method: suitable for 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 drug solution is uniform milky white and there is no oil slick on it, there is no precipitation under it, indicating that the drug is good. Otherwise, it is a failed pesticide. The more the upper layer of oil slick, the worse the medicinal properties.
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