Testing methods for pesticide quality: The dilution method is a simple way to assess the quality of an emulsifiable concentrate. Take 100 grams of the pesticide and mix it with 300 grams of water in a glass bottle. Shake the mixture vigorously and let it sit for about 30 minutes. If the solution appears uneven, with visible oil droplets or a milky layer on top, and sediment at the bottom, it indicates that the product has degraded and is no longer effective. The more emulsification observed, the lower the quality of the pesticide. The floating test is used for wettable powders. Take 1 gram of the pesticide and spread it evenly over 200 ml of clear water. If the powder is fully wetted within one minute and sinks into the water, it is considered to be of good quality. If it floats on the surface or does not dissolve quickly, it may have lost its effectiveness. The shaking test helps determine if an emulsion pesticide is still stable. If the oil and water components have separated, shake the bottle forcefully. After letting it stand for one hour, if the separation is still visible, the pesticide is likely to be ineffective. The hot dissolution test involves placing the pesticide with sediment into warm water at 50°C for one hour. If the sediment dissolves slowly, the product is still usable. However, if the sediment remains undissolved or forms clumps, the pesticide has deteriorated and should not be used. The suspension test checks the dispersibility of wettable powders. Take 50 grams of the pesticide and add it to a glass container filled with water. Stir thoroughly and let it sit for 10 minutes. If the powder does not dissolve well and the suspended particles are coarse, it suggests that the product is of poor quality. This article was originally published by the China Pesticide Network. Please cite the source if you use this information.
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Sealand Mass flow meter measures the mass based on Coriolis effort. The operating principle
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