Pesticide soaking attention
Pay attention to the selection of pharmaceutical formulations for the soaking of pharmaceutical formulations is the use of diluents, the use of drugs must be dissolved in water. Can not be soaked with powder, because the powder is insoluble in water, powder floating on the surface of the water or sinking, uneven drug seed, can not achieve the effect of soaking sterilization.
The concentration of the agent used to accurately prepare the solution for soaking is not calculated based on the weight of the seed, and is generally calculated based on the content of the effective component of the agent. The soaking agent concentration is generally related to the soaking time. When the concentration is low, the soaking time may be slightly longer. When the concentration is high, the soaking time should be shortened. If the concentration is not accurately grasped, the phytotoxicity is likely to occur or the soaking effect is reduced.
Mastering the soaking time for the soaking of pesticides has certain time requirements. If the time is too long, it will produce phytotoxicity. If it is too short, it will not achieve the purpose of disinfection. Specific soaking time according to the instructions for use of drugs to operate.
Immersed seeds should be rinsed and air-dried Seeds with poor tolerance to pesticides should be rinsed with water after they have been soaked to avoid phytotoxicity. If you do not specify how to wash after dipping, you do not need to wash. Regardless of the need or need of washing, general soaking should be followed by drying, but some can also be sowed directly after soaking, depending on the type of pesticide and soil moisture conditions.
The liquid level of the liquid should be higher than that of the seeds. When soaking the liquid, the liquid should be higher than the seed by more than 16 cm to prevent the seeds from swelling after being exposed to water and reduce the soaking effect.
Stir the seeds thoroughly and put them into the liquid to be fully stirred to eliminate the bubbles in the liquid, so that the seeds and the liquid are in full contact and the soaking effect is improved.
A magnetic stirrer or magnetic mixer is a laboratory device that employs a rotating magnetic field to cause a stir bar (or flea) immersed in a liquid to spin very quickly, thus stirring it. The rotating field may be created either by a rotating magnet or a set of stationary electromagnets, placed beneath the vessel with the liquid.
Magnetic stirrers are often used in chemistry and biology, where they can be used inside hermetically closed vessels or systems, without the need for complicated rotary seals. They are preferred over gear-driven motorized stirrers because they are quieter, more efficient, and have no moving external parts to break or wear out (other than the simple bar magnet itself). Magnetic stir bars work well in glass vessels commonly used for chemical reactions, as glass does not appreciably affect a magnetic field. The limited size of the bar means that magnetic stirrers can only be used for relatively small experiments, of 4 liters or less. Stir bars also have difficulty in dealing with viscous liquids or thick suspensions. For larger volumes or more viscous liquids, some sort of mechanical stirring is typically needed.
Because of its small size, a stirring bar is more easily cleaned and sterilized than other stirring devices. They do not require lubricants which could contaminate the reaction vessel and the product. Magnetic stirrers may also include a hot plate or some other means for heating the liquid.
Lab Stirrer,Lcd Digital Overhead Stirrer,Lab Overhead Stirrer,Digital Magnetic Hotplate Stirrer
Unimedsume Trading Co., Ltd , https://www.ums-labmed.com