Aging pesticides, how to identify whether it is available

A wettable powder. Take 1 part of the wettable powder, add 200 parts of water, and put it in a glass. Shake well and wait for a certain period of time to observe the suspension. If the drug precipitates slowly, it indicates good suspension. In case of poor quality, silicone additives or 0.10% neutral laundry detergent should be added before use to increase moisturizing performance. If the wettable powder binds to a hard block, it should not be used as a spray.

Two powders. Powder in the storage process if the absorption of moisture agglomeration, you need to be placed in a cool well-ventilated place to dry not sun, crushed before use, if the agglomeration is more serious, can only be used for toxic soil.

Three EC. In the course of custody of emulsion pesticides, if the storage is poor, the following three conditions may occur.

1, agglomeration phenomenon. If the emulsifiable concentrate has been a non-flowable viscous liquid or has formed a soapy solid, it is proved that the solvent has mostly volatilized and the quality has changed and cannot be used.

2, precipitation crystallization phenomenon. For long-term storage of the emulsion, white crystals or turbid substances may appear on the bottom of the bottle. If its cream bottle is immersed in warm water of 30-40°C, the crystals can be dissolved in about 30 minutes to return to a transparent liquid, indicating that the quality is good and can be used. If it does not dissolve, it indicates that the quality of the emulsifiable concentrate has changed and cannot be used.

3, emulsion emulsifying properties change. Take 1 part of EC, add 200 parts of water and place it in a glass. Shake well and wait for about half an hour. Observe the emulsification. If there is no slick in the upper layer, there will be no sediment in the lower layer and no oil bead in the middle, indicating good emulsification performance; There is emulsifiable concentrate, there is sedimentation, there is stratification after 10 minutes, indicating that the emulsion is destroyed can not be used.

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