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Pesticides are special commodities that involve human health, agricultural products and environmental safety. Their product standards are national mandatory standards. The quality of pesticide products is generally measured by various technical indicators in their product standards. Different pesticide formulations have different technical requirements. The main technical indicators are as follows: wettable powder should have appearance, active ingredient content, suspension rate, wettability, pH value, moisture, sieve analysis, etc.; suspending agent should have appearance, Active ingredient content, suspension rate, pH value, sieve analysis, pouring property, etc.; emulsifiable concentrate should have appearance, active ingredient content, emulsion stability, pH value, moisture, etc.; smoke agent should have appearance, active ingredient content, smoke generation rate, pH, moisture, burning time, etc. Appearance This is an important indicator of pesticide products, which directly reflects the external state of the product. Different pesticide formulations have different appearance requirements. Such as emulsifiable concentrate: stable homogeneous liquid, no visible suspended matter and sedimentation; wettable powder: free-flowing loose powder, should not have agglomerate; suspending agent: a uniform suspension of flow, long-term storage may have a small amount of precipitation or centrifugation Layer, but should be able to return to its original state by shaking at room temperature, and there should be no agglomeration. Active ingredient content A specific component of a pesticide product that is biologically active, that is, a component that is effective when a pesticide is applied. The content of active ingredients is the most important technical indicator in the pesticide product standard. The content of active ingredients does not meet the standard requirements, which will result in poor effect after application. Suspension rate refers to the ability of the active ingredient to remain suspended in the suspension for a certain period of time and to be uniformly dispersed. When the product with good suspension is used in watering, all the active ingredients can be uniformly suspended in the water, and the active ingredients can be uniformly sprayed on the crop to be controlled when applied. Emulsion stability It is used to measure the uniformity and stability of the dispersion of pesticide beads in water in the emulsion formed by dilution of the cream product with water. When emulsion pesticides are used, they are usually diluted with water and sprayed. It is required that the beads can be evenly distributed in the water for a long time, and the oil and water are not separated, so that the effective components and concentrations in the emulsion are kept uniform, and the effects are fully exerted to avoid phytotoxicity. occur.
Wettability The time it takes for a pesticide sample to sprinkle on the surface until it is completely wetted. The purpose of limiting the wetting time is to make the pesticide quickly wet when diluted with water before application, and to disperse into a uniform suspension liquid, so that the effect is uniform.
The pH value is mainly to ensure the stability of the active ingredients in the product, to reduce decomposition; to prevent changes in the physical and chemical properties of the product or to cause phytotoxicity during use; to avoid corrosion of packaging materials. Each finite component has its own stable pH range.
Screening The purpose of this indicator is to limit the insoluble particle content to avoid clogging the nozzle and filter during application. The second is to control the fineness range of the product to increase the suspension rate.
Moisture is an important technical indicator of pesticide products. The purpose of limiting the moisture content is to reduce the decomposition of the active ingredients in the product, and to keep the solid pesticide preparations in a good dispersion state.
Dumping is a technical indicator of pesticide suspension products. The purpose of this indicator is to ensure that the product can be poured out of the container evenly and smoothly.
Tobacco rate This is one of the technical indicators of smoke products. The purpose of this indicator is to ensure that after the smoked product is ignited into smoke, there are enough active ingredients to volatilize, evaporate or sublimate without decomposing in large quantities.
Wettability The time it takes for a pesticide sample to sprinkle on the surface until it is completely wetted. The purpose of limiting the wetting time is to make the pesticide quickly wet when diluted with water before application, and to disperse into a uniform suspension liquid, so that the effect is uniform.
The pH value is mainly to ensure the stability of the active ingredients in the product, to reduce decomposition; to prevent changes in the physical and chemical properties of the product or to cause phytotoxicity during use; to avoid corrosion of packaging materials. Each finite component has its own stable pH range.
Screening The purpose of this indicator is to limit the insoluble particle content to avoid clogging the nozzle and filter during application. The second is to control the fineness range of the product to increase the suspension rate.
Moisture is an important technical indicator of pesticide products. The purpose of limiting the moisture content is to reduce the decomposition of the active ingredients in the product, and to keep the solid pesticide preparations in a good dispersion state.
Dumping is a technical indicator of pesticide suspension products. The purpose of this indicator is to ensure that the product can be poured out of the container evenly and smoothly.
Tobacco rate This is one of the technical indicators of smoke products. The purpose of this indicator is to ensure that after the smoked product is ignited into smoke, there are enough active ingredients to volatilize, evaporate or sublimate without decomposing in large quantities.
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