First, the visual inspection method: For powder pesticides, start by examining the appearance. If the product is visibly damp, clumped together, has a weak or strange odor, or can be easily pressed into lumps, it's likely to have degraded. For emulsion-based pesticides, check the bottle after standing for a while. If the liquid appears cloudy, separates into oil and water layers, forms sediment, or has floating particles, the pesticide is probably no longer effective.
Second, the heating test: This is ideal for dry powders. Take 5–10 grams of the pesticide and place it on a metal sheet. Heat it gently. If it produces a lot of white smoke and emits a strong, pungent smell, the pesticide is still good. If there's little smoke or an unusual odor, it may have expired.
Third, the floating test: Best suited for wettable powders. Take 200 grams of clean water and add 1 gram of pesticide. Gently spread it on the surface of the water and observe closely. If it dissolves or disperses within one minute, it’s still effective. If it doesn’t dissolve and floats or settles quickly, the product has likely failed.
Fourth, the suspension test: Also for wettable powders. Take 30–50 grams of the pesticide, mix it with a small amount of water to form a paste, then add 150–200 grams of water and shake well. Let it sit for 10 minutes. A good pesticide will remain well suspended, with fine particles that settle slowly. If the particles sink quickly and form a thick layer, the product is likely degraded.
Fifth, the shaking test: Ideal for emulsions. Shake the bottle vigorously and let it stand for an hour. If the liquid separates into layers, the pesticide has likely deteriorated and should not be used.
Sixth, the hot-melt test: Suitable for emulsion pesticides. Place the bottle in warm water (around 50–60°C) for an hour. If the precipitate dissolves, the pesticide is still usable. If it doesn't dissolve or remains as a solid mass, it has likely failed.
Seventh, the dilution test: Perfect for emulsions. Mix 50 grams of pesticide with 150 grams of water and shake for 30 minutes. If the mixture becomes uniformly milky and clear, with no oil layer or sediment, the pesticide is still effective. If oil floats on top or sediment forms, the product has likely lost its quality.
These methods are simple yet effective ways to assess the quality of pesticides at home or in the field. Always make sure to follow safety guidelines when handling chemicals, and if in doubt, consult a professional.
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It is used for general isolation in outpatient clinics, wards, and laboratories of medical institutions; it plays a protective role during inspection and treatment in medical institutions, and blocks body fluids, blood splashes or splashes of national essential medicines For general isolation in the room, etc.; medical institutions play a protective role during inspection and treatment, blocking bodily fluids, blood splashes or splashes. The main components are usually composed of protective cover, foam strips and fixtures made of polymer materials. Mechanism of action [Material] overall food-grade flexible PVC silicone material; rigid polycarbonate PC explosion-proof lens
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