In the process of custody and use of pesticides, if the method is not proper, new chemical reactions will occur in the quality of the pesticides, causing changes in the original properties and even deterioration. Temperature, humidity, light, air, and pH all cause deterioration of pesticides.
The higher the temperature, the greater the impact on the quality of pesticides. For example, trichlorfon crystals begin to soften at about 30°C, and completely melt into liquid at 70°C-80°C. The volatile nature of dichlorvos is also related to temperature. The higher the temperature, the greater the volatility. Experiments have shown that at 35°C, the volatile content of dichlorvos is 1.4 times greater than at 20°C. Therefore, general pesticides are easily decomposed after they experience temperatures above 35°C. Emulsifiable pesticides can easily burn and explode when exposed to high temperatures. In addition, too low a temperature has a great influence on the quality of pesticides. If the liquid pesticide encounters a low temperature below 0°C, it will crystallize into icing, which will reduce the emulsifying power and cause the efficacy to decline. Therefore, in addition to the prevention of high temperatures, the storage and use of pesticides should also prevent freezing at low temperatures.
Humidity Humidity in the air will cause pesticides to lose their toxicity. For example, organophosphorus pesticides can easily react with water and decompose and fail. In case of high temperature and high humidity, this hydrolysis rate will further accelerate. Powder pesticides absorb the moisture in the air, and the particles will clump and thicken, which will reduce the efficacy of the powder and even cause it to fail. Therefore, during the storage and storage of pesticides, it is necessary to pay attention to the prevention of moisture, especially powder pesticides should be hung or placed in a dry, ventilated place.
Illumination In the external conditions that cause deterioration of pesticides, light is also a factor that cannot be ignored because sunlight can cause poisons in pesticides to produce optical reactions that fail. Therefore, bottles containing pesticides are generally made of colored glass or non-ferrous plastics, so as to protect them from sunlight and protect the quality. According to this chemical property of pesticides, it should be kept in a cool and dry place in storage and storage.
In terms of air, pesticides should be packed and kept tight in storage and storage. This aspect can prevent moisture and volatilization. On the other hand, it can also avoid contact with air, because some pesticides cause changes in quality after they are exposed to air and undergo oxidation.
Acid-base pesticides are generally stable in neutral or acidic solutions, but can easily decompose and fail in the presence of alkaline substances. Therefore, most pesticides cannot be contacted with alkaline substances such as lime, ash, washing powder, soap, caustic soda, etc., either in storage or in use.
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