Intuitive method for powder pesticide, pharmaceutical exterior look, if you have that wet agglomeration, Smell no smell and thick, or other groups can be twisted by hand, indicating that it has basically failed; of pesticide emulsions, first bottle standing, If the liquid turbid or stratification that oil-water separator, a generation or floc sediment suspension, indicating that agents may have failed.
Heating method for powder pesticide. Take 5 to 10 grams of pesticides, on the sheet metal on the heat, if they have a lot of white smoke, and have strong pungent odor, indicating a good agent. Otherwise, the note had expired.
WP floating method for pesticides. 200 grams of water glass first, then weigh 1 gram of pesticides, gently and evenly spread on the water look closely, within 1 minute and can sink into the wet water is not expired pesticides, or is the failure of pesticides.
Hot-melt emulsion method for pesticides. To have even the bottle of pesticide sediment into the warm water in the wet with not too high, to 50 ℃ ~ 60 ℃ is appropriate, for 1 hour after the observation, if the precipitate slowly dissolved, indicating agents has not yet expired, until the precipitate dissolvedcan continue after the re-use; if precipitate insoluble or insoluble, indicating that has failed and can no longer work.
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