Each pesticide has its own characteristics, and it can be identified whether the pesticide has failed based on changes in its inherent characteristics. According to different pesticide varieties and dosage forms, one or two of the following simple and effective methods can be used to identify the failure.
(1) Intuitive method: Firstly, whether the product has passed the expiration date, the effective period of the pesticide is generally calculated from the date of production of the product, and the time is two years. If the expiration date expires, the pesticide will deteriorate. In the period of validity of the product, it depends on the change of appearance characteristics: if the powder pesticide has been obviously agglomerated by moisture, the smell is not strong or there are other odors, it means that it has failed; the emulsion pesticide should be left to observe the bottle first, if the liquid is turbid. Clear or stratified or precipitated or flocculent suspensions indicate a high probability of failure of the agent. (2) Oscillation method: For emulsion pesticides with upper and lower stratification, the mixture can be stirred up and down for one hour by shaking up and down. If stratification occurs, the product has failed. (3) Cauterization method: Take 5g ~ 10g of powder pesticide on a piece of metal and heat it with fire. If a large amount of white smoke is produced, and there is a strong pungent smell, it means that the medicine is good. (4) Hot solution method: suitable for emulsion pesticides. The precipitated pesticide is placed in hot water at 50 ° C to 60 ° C, and after one hour of observation, if the precipitate is difficult to dissolve or dissolve, the drug has failed. (5) Floating method: suitable for wettable powder pesticides. First take 200 ml of clean water into a transparent glass, then take 1 gram of the medicine and gently spread it on the water surface. Then carefully observe the change of the powder: the non-failed pesticide is wet and soluble in water in one minute.
(1) Intuitive method: Firstly, whether the product has passed the expiration date, the effective period of the pesticide is generally calculated from the date of production of the product, and the time is two years. If the expiration date expires, the pesticide will deteriorate. In the period of validity of the product, it depends on the change of appearance characteristics: if the powder pesticide has been obviously agglomerated by moisture, the smell is not strong or there are other odors, it means that it has failed; the emulsion pesticide should be left to observe the bottle first, if the liquid is turbid. Clear or stratified or precipitated or flocculent suspensions indicate a high probability of failure of the agent. (2) Oscillation method: For emulsion pesticides with upper and lower stratification, the mixture can be stirred up and down for one hour by shaking up and down. If stratification occurs, the product has failed. (3) Cauterization method: Take 5g ~ 10g of powder pesticide on a piece of metal and heat it with fire. If a large amount of white smoke is produced, and there is a strong pungent smell, it means that the medicine is good. (4) Hot solution method: suitable for emulsion pesticides. The precipitated pesticide is placed in hot water at 50 ° C to 60 ° C, and after one hour of observation, if the precipitate is difficult to dissolve or dissolve, the drug has failed. (5) Floating method: suitable for wettable powder pesticides. First take 200 ml of clean water into a transparent glass, then take 1 gram of the medicine and gently spread it on the water surface. Then carefully observe the change of the powder: the non-failed pesticide is wet and soluble in water in one minute.
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