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 varieties and dosage forms of pesticides, one or two of the following simple and effective methods can be used to identify whether they are invalid. China Pesticide Network Xiaobian introduces you: Temperature Sensor,Thermocouple Thermometer,Temperature Monitor,Temperature Instruments Wuxi Winsun Automation Instrument Co., Ltd , https://www.jswxwinsun.com
Intuitive method: First check 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. The time is two years. If the expiration date expires, the pesticide will deteriorate. In the period of validity of the product, there must be changes in the appearance characteristics: if the powder pesticide has been obviously agglomerated by moisture, the odor 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.
Oscillation method: For emulsion pesticides with upper and lower layers, it can be mixed up and down by shaking up and down for one hour, if no layering occurs. Indicates that the product has not expired. If stratification still occurs, the pesticide has expired.
Burning method. Take the powder pesticide 5 - 10 grams 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. Otherwise, it indicates that the agent has failed.
Hot solution method: suitable for emulsion pesticides. Put the pesticide that has precipitated into the hot water at 50-60 °C, and observe it after one hour. If the precipitate is difficult to dissolve or dissolve, it indicates that the drug has failed. Rinsing method: Suitable for wettable powder pesticides. First take 200 ml of clean water into a transparent glass, then take a gram of powder and gently spread it on the surface of the water. Then carefully observe the changes in the pesticide. It is a non-failed pesticide that is wet and soluble in water in one minute. otherwise. Indicates that the drug has expired.