An Analytical Balance (often called a "lab balance") is a class of balance designed to measure small mass in the sub-milligram range. The measuring pan of an analytical balance (0.1 mg or better) is inside a transparent enclosure with doors so that dust does not collect and so any air currents in the room do not affect the balance's operation. This enclosure is often called a draft shield. The use of a mechanically vented balance safety enclosure, which has uniquely designed acrylic airfoils, allows a smooth turbulence-free airflow that prevents balance fluctuation and the measure of mass down to 1 μg without fluctuations or loss of product.[citation needed] Also, the sample must be at room temperature to prevent natural convection from forming air currents inside the enclosure from causing an error in reading. Single pan mechanical substitution balance maintains consistent response throughout the useful capacity is achieved by maintaining a constant load on the balance beam, thus the fulcrum, by subtracting mass on the same side of the beam to which the sample is added.[citation needed]
Electronic analytical scales measure the force needed to counter the mass being measured rather than using actual masses. As such they must have calibration adjustments made to compensate for gravitational differences. They use an electromagnet to generate a force to counter the sample being measured and outputs the result by measuring the force needed to achieve balance. Such measurement device is called electromagnetic force restoration sensor.
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(I) Properties and Functions The original drug is a colorless crystal and can be miscible with lower alcohols, aromatic hydrocarbons and most organic solvents. Slow hydrolysis in acid and alkaline media. Chloramphirine is a low-toxicity herbicide and plant growth regulator. The acute oral drug of LD504200 mg/kg is used in rats, and the rabbit acute dermal LD50 is less than 2000 mg/kg. No sub-chronic oral dose of 420 mg/kg/day was given to rats, and rabbits had no effect of 500 mg/kg/day. No irritation to the skin, slight eye irritation, dog chronic no effect dose 5.5 mg/kg/day. Goldfish and salmon LC50 (48 hours) are 10-40 mg/L. The allowable concentration in air is 1.47 mg/l. Formulations are low in toxicity. Chlorobenzene is a carbamate-selective preemergence, preemergence and early postemergence herbicide. It is absorbed and transmitted by root buds and sprouts during excavation, inhibits cell mitosis, and inhibits the growth of weed grass sprouts. Volatile, its vapor can be absorbed by the seeds and seedlings of dodder and kill the dodder. By steam fumigation, chlorpheniramine sublimates into a gaseous state and acts as a bud inhibiting effect. The stored tips of the potato buds are significantly damaged. The end buds and lateral buds can germinate at the same time, but it is difficult to germinate and does not affect the value of food without using drugs. Stored under the same conditions, the apical bud of potato has obvious advantages, and the growth rate is fast after germination. The bud length exceeds 10 cm in 60-70 days storage and loses the food value.
(b) Preparation 0.7% powder, 50% aerosol.
(3) Method of application Potato sprouting: After at least 2 weeks after the potato is harvested, the potato will naturally heal when it is harvested. After sprouting, it shall be applied to ripe, healthy, dry-dried potato chips at any time before sprouting, or it may be stored in winter through winter dormancy. During the period of the potato block, 1000 kg of potato is used with 0.7% powder 1.4 kg. The cleaned potato blocks with lime soil removed are placed in baskets, boxes, and bags. The powder is evenly distributed on the potato block and then covered with large plastic cloth. . More than 50 kilograms of potatoes stacked on the floor of the pit chamber are divided into several layers and evenly spread on the cleaned potato block by the amount of medicine or gently blow the weighed medicament into the potato stack with a duster. Make it evenly distributed. Or 50% of the aerosol is introduced into the potato layer at 40 grams (1 kg 0.04 grams) of 1000 kg potato. Storehouses and chambers are kept at 6-15°C room temperature, protected from light for 60 days, and the number of germinations is only 0-5% of the ratio of buds to eyes. The number of buds that do not apply is more than 90%, and the bud length exceeds 10 cm, losing the value of food.
(4) Precautions
1. The powder can be automatically sublimated into gas to achieve the effect of inhibiting germination, so the application of pesticide should be uniform. If the storage period is long, it can be re-applied after 2 months of medication, keep at room temperature, and store in dark place.
2. The potato bud suppression agent Dai Ke cannot be used on field or seed potatoes.
3. According to China's habit of being stored at 2-4°C, the amount of reducing sugar contained in potatoes increases. The taste and color of French fries thus made cannot meet the requirements. However, when stored at above 6-8°C, germination becomes serious. The problem is that treatment with potato sprouts is an essential means.
Plant growth regulator Chlorophenylamine Introduction
Other names Daiko, Decco273, CIPC, Short-stop