Two-dilution method is good for formulating pesticide liquids
2020-10-24 13:18:17
The secondary dilution method for preparing a pesticide solution is to use a small amount of water to make the solution into a thick mother liquor and then dilute it to the desired concentration, which has many advantages over the one-time dispensing.
First, to ensure uniform dispersion of the agent in water. For example, wettable powders and powders tend to agglomerate into coarse granules. If the granules are dispensed directly into the tank, the coarse granules are not fully dispersed and they sink into the water. It is very difficult. Therefore, firstly use a small amount of water to form a relatively thick mother liquor and stir it enough to disperse the powder and pour it into the pot to make the final dilution. Suspension of glue is prone to sedimentation during storage, that is, the upper layer gradually becomes thinner and the lower layer becomes thicker. A two-step method must be used to prepare the drug solution.
Second, to facilitate accurate drug use With the development of high-efficiency agriculture in recent years, the dosage per acre only takes a dozen grams (or milliliters) or even a few grams of pesticide, and the amount allocated to each sprayer is less. The use of two-step preparation at this time is conducive to accurate drug taking. Such as wheat field herbicide "Kow grass", 8 grams of wettable powder, if sprayed on 45 kilograms of water (15 kilograms), only 2 grams of drug use, once the preparation is not easy to accurately measure, but difficult to dilute Uniform. Therefore, 8 grams of the original drug can be added with 600 grams of water into the mother liquor, then each barrel with 200 grams of mother liquor added 15 kg of water to dilute Serve.
Third, can reduce the risk of pesticide poisoning For highly toxic pesticides, adopt two-step preparation can reduce the chance of exposure to the original drug. For example, the use of highly toxic pesticides 40% monocrotophos EC 50 grams water 50 kg, one-step method has 4 times the opportunity to contact with the original drug, and the only two-step method, the possibility of poisoning is greatly reduced.
First, to ensure uniform dispersion of the agent in water. For example, wettable powders and powders tend to agglomerate into coarse granules. If the granules are dispensed directly into the tank, the coarse granules are not fully dispersed and they sink into the water. It is very difficult. Therefore, firstly use a small amount of water to form a relatively thick mother liquor and stir it enough to disperse the powder and pour it into the pot to make the final dilution. Suspension of glue is prone to sedimentation during storage, that is, the upper layer gradually becomes thinner and the lower layer becomes thicker. A two-step method must be used to prepare the drug solution.
Second, to facilitate accurate drug use With the development of high-efficiency agriculture in recent years, the dosage per acre only takes a dozen grams (or milliliters) or even a few grams of pesticide, and the amount allocated to each sprayer is less. The use of two-step preparation at this time is conducive to accurate drug taking. Such as wheat field herbicide "Kow grass", 8 grams of wettable powder, if sprayed on 45 kilograms of water (15 kilograms), only 2 grams of drug use, once the preparation is not easy to accurately measure, but difficult to dilute Uniform. Therefore, 8 grams of the original drug can be added with 600 grams of water into the mother liquor, then each barrel with 200 grams of mother liquor added 15 kg of water to dilute Serve.
Third, can reduce the risk of pesticide poisoning For highly toxic pesticides, adopt two-step preparation can reduce the chance of exposure to the original drug. For example, the use of highly toxic pesticides 40% monocrotophos EC 50 grams water 50 kg, one-step method has 4 times the opportunity to contact with the original drug, and the only two-step method, the possibility of poisoning is greatly reduced.
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