Herbicides, also known as herbicides, are agents that allow weeds to die completely or selectively. The development of herbicides in the world has gradually stabilized, mainly developing high-efficiency, low-toxic, broad-spectrum, low-dose varieties, and disposable treatment agents with little environmental pollution have gradually become mainstream.
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Rotary evaporator 2liter-- RE201E
Rotary evaporator 3liter--RE301
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The purpose of the rotary evaporator rotovap is to remove low boiling organic chemicals, usually solvents, from a mixture of compounds .
The rotary evaporator always for distillation and extraction under vacuum pressure . The motor runs the rotation flask moving and heating water oil bath pass hot energy to the mixture of rotary flask . Then low boiling point of mixture will be heated and form a thin film and make evaporation . The lower boiling point mixture make morphological change from liquid to Vapor or hot air . Then hot vapor meet condenser cooling coil then become liquid again and fall down to collection flask .
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Herbicide classification:
First, herbicides can be classified according to the mode of action, the site of application, the source of the compound, and the like.
(1) Contact-type herbicide: When the agent is in contact with weeds, only the part in contact with the agent is killed, and the local killing effect is exerted, and the plant body cannot be transmitted. It can only kill the aerial parts of weeds, and it is less effective for the underground parts of weeds or perennial deep-rooted weeds with underground stems. Such as herbicide ether, paraquat and so on.
(2) Systemic herbicides: After being absorbed by roots or leaves, spores or stems, the agents are transported to the plants to cause the plants to die. Such as glyphosate, chlorpyrifos and so on.
(3) Systemic absorption and contact killing herbicides: It has the functions of systemic conduction and contact killing, such as herbicide.
2. Classification according to the method of use (1) Stem and leaf treatment agent: The herbicide solution is watered and sprayed evenly on the plant with fine mist droplets. The herbicide used in this spraying method is called stem and leaf treatment agent, such as grass cover. Can, glyphosate, etc.
(2) Soil treatment agent: the herbicide is evenly sprayed onto the soil to form a layer of a certain thickness. When the seedlings, seedlings and roots of the weed seeds are contacted and absorbed, the grass killing action is exerted. Herbicides, called soil treatment agents, such as simazine, chlorpyrifos, trifluralin, etc., can be applied by spraying, pouring, or toxic soil.
(3) Stem and leaf, soil treatment agent: can be used for stem and leaf treatment, but also for soil treatment, such as atrazine.
3. Classification according to chemical structure (1) Inorganic compound herbicide: A compound composed of natural mineral raw materials and containing no carbon, such as potassium chlorate or copper sulfate.
(2) Organic compound herbicide: mainly synthesized from organic compounds such as benzene, alcohol, fatty acid and organic amine. Such as ethers - Gore, s-trinitrobenzene - chlorpyrifos, substituted urea - herbicide No. 1, phenoxyacetic acid - 2 methyl 4-chloro, pyridine - grass, can Alkyl anilines - trifluralin, amides - cables, organophosphorus - glyphosate, phenols - sodium pentachlorophenol.
Rotary evaporator 1liter-- RE201D