First, the observation method: powder pesticide obvious agglomeration or hand-clumped into agglomerates, not easily broken, indicating that the drug has failed and can not be used. Powder pesticides generally have a water content below 55%, and agglomeration is caused by storage for too long, excessive water absorption, and decomposition of active ingredients. Emulsion Pesticides have been found to have precipitation and layered flocculation in the pesticide. This vial can be placed in hot water and allowed to stand for 1 hour. If the precipitate is decomposed, the flocculent disappears, indicating that the pesticide is effective; otherwise, it cannot be used.
Second, the burning method This method is used to identify powder pesticides. Take 10-20 grams of powder pesticide, put it on a piece of metal and put it on fire to burn it. If white smoke is found, it means that the pesticide has not failed. Otherwise, it means that it has failed, and it is usually used to identify 5% of doline powder.
Third, the shock method This method is used to identify emulsion pesticides. According to the characteristics of easy separation of emulsion pesticides, first look at whether it is stratified, if it is not stratified, the pesticide is effective; if it is stratified, it can oscillate several times up and down, make it uniform, and let it stand for 40-60 minutes, then carefully Observe that if you stratify again, it means that the pesticide has failed and you cannot use it.
IV. Dissolution method This method is used to identify precipitated emulsion pesticides. Place the vial in water at 40°C-60°C for about 60 minutes. If the bottom of the bottle dissolves, it means that the pesticide has not failed. If the precipitate does not dissolve, the precipitate can be filtered out, take a small amount and add appropriate amount of warm water, if the precipitate dissolves, indicating that the pesticide can still be used.
Fifth, the water method This method is used to identify powder, wettable powder and emulsion pesticides. If it is a powder, you can take 50 grams of the drug into the glass and add the appropriate amount of water, stirring to dissolve it, let stand for half an hour, if the particles are suspended evenly and there is no sediment at the bottom of the bottle, indicating that the pesticide has not failed. The wettable powders are easy to agglomerate when stored, and the agglomerates can be powdered first and a small amount of fresh water can be added. If dissolved quickly, it means that the pesticide is effective, otherwise it cannot be used. In addition, the pesticide sample can be lightly sprinkled on the water surface, and the effective pesticide can be completely submerged in water for about 1 minute; if the floating surface is not wet for a long time, it is a pesticide that is invalid or less effective. If it is an emulsion, take a small amount into a glass, add an appropriate amount of water to stir, and let stand for 30 minutes. If there is no oil on the surface of the water, there is no sediment at the bottom of the cup, indicating that the pesticide is effective.
Second, the burning method This method is used to identify powder pesticides. Take 10-20 grams of powder pesticide, put it on a piece of metal and put it on fire to burn it. If white smoke is found, it means that the pesticide has not failed. Otherwise, it means that it has failed, and it is usually used to identify 5% of doline powder.
Third, the shock method This method is used to identify emulsion pesticides. According to the characteristics of easy separation of emulsion pesticides, first look at whether it is stratified, if it is not stratified, the pesticide is effective; if it is stratified, it can oscillate several times up and down, make it uniform, and let it stand for 40-60 minutes, then carefully Observe that if you stratify again, it means that the pesticide has failed and you cannot use it.
IV. Dissolution method This method is used to identify precipitated emulsion pesticides. Place the vial in water at 40°C-60°C for about 60 minutes. If the bottom of the bottle dissolves, it means that the pesticide has not failed. If the precipitate does not dissolve, the precipitate can be filtered out, take a small amount and add appropriate amount of warm water, if the precipitate dissolves, indicating that the pesticide can still be used.
Fifth, the water method This method is used to identify powder, wettable powder and emulsion pesticides. If it is a powder, you can take 50 grams of the drug into the glass and add the appropriate amount of water, stirring to dissolve it, let stand for half an hour, if the particles are suspended evenly and there is no sediment at the bottom of the bottle, indicating that the pesticide has not failed. The wettable powders are easy to agglomerate when stored, and the agglomerates can be powdered first and a small amount of fresh water can be added. If dissolved quickly, it means that the pesticide is effective, otherwise it cannot be used. In addition, the pesticide sample can be lightly sprinkled on the water surface, and the effective pesticide can be completely submerged in water for about 1 minute; if the floating surface is not wet for a long time, it is a pesticide that is invalid or less effective. If it is an emulsion, take a small amount into a glass, add an appropriate amount of water to stir, and let stand for 30 minutes. If there is no oil on the surface of the water, there is no sediment at the bottom of the cup, indicating that the pesticide is effective.
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