2-Pyrazinecarboxamide, 5-chloro-

It has a cold, salty and bitter taste. When it enters the medicinal tract, it has the ability to be soft, firm, moisturizing, and laxative. The quality of Yang Fu's foreign nitrate is crystal clear like snow, and it melts when heated. It dissolves in water and is silent.
The nature of foreign nitrate in fire is easy to melt when heated, so it is suitable to hide it in a cool and dry place. If it is exposed to the hot sun, or near the side of a fire candle, it is easy to dissipate and formless. It is in harmony with other things and can change the nature of things. In gold and stone, it also has the power of corrosion.
And foreign nitrate is in water, which is very easy to dissolve. Its liquid is clear and colorless, and it tastes salty. Placing it in water can make the water temperature drop, which is also different from ordinary things.
With its cold nature, it has a good effect on hot diseases in the human body, such as constipation with real heat, swelling and pain in the eyes, and swelling and pain in the throat. When using it, you must review its dosage. If you can't pass it, it will cause damage and cause other diseases.
As for the nature of foreign nitrate, it needs to be carefully considered when it is compatible with various medicines. When combined with medicine for bitterness and cold, its heat-relieving power is even greater; when used with medicine for nourishment, it needs to be weighed to prevent it from attacking too much. And foreign nitrate can not be used with sulfur, the two meet, or a violent change, this is a drug taboo, must be observed.

Mercury, also known as mercury, is a liquid metal and is highly toxic. Dimethylmercury is an organic mercury compound, which is particularly toxic. Ordinary people touch it, and few people can get out of it.
Mercury has a wide range of uses. In the field of traditional medicine, it was used as a medicine in ancient times to cure diseases. As stated in the Compendium of Materia Medica, mercury can cure scabies, sores and other diseases. However, at that time, the knowledge was limited, and the huge toxicity of mercury was not known. Misuse of it often caused harm.
In industry, mercury also plays an important role. In the past, in the chlor-alkali industry, mercury electrodes were mostly used to electrolyze salt water to produce caustic soda and chlorine gas. However, the escape of mercury caused environmental mercury pollution and harm to the ecology. In the electronics industry, mercury is used to make thermometers, sphygmomanometers, etc. Due to its precise characteristics of thermal expansion and contraction, it can measure subtle temperature and pressure changes. However, such equipment is damaged and mercury leaks, which becomes a source of pollution.
As for dimethylmercury, although it is not a common thing in daily life, it is occasionally used in the field of scientific research. It has been used in some special experiments as a catalyst or reaction reagent. However, due to its terrible toxicity, it is necessary to be extremely cautious in operation. If there is a slight mistake, the contact may be deeply damaged. There have been scientific researchers who were accidentally exposed to dimethylmercury. After a few months of toxicity, the treatment was ineffective and died. This is a painful lesson.
Today, in view of the harm of mercury and dimethylmercury, many countries and regions have severely restricted its use. We are committed to the development of alternative materials and processes to minimize mercury pollution and protect ecological and human health while meeting the needs of production and scientific research.

To prepare ferric pentacarbonate diacetonitrile (II), the method is as follows:
First take an appropriate amount of iron source, usually anhydrous ferrous chloride, and place it in a clean and dry reaction vessel. Add an appropriate amount of acetonitrile, which needs to be pretreated with water removal to ensure the purity of the reaction environment. The two are mixed and stirred slowly to make the initial contact fusion.
Then, the reaction system is placed in a device that can precisely control the temperature, and gradually reduce the temperature to a suitable range, about -20 ° C to 0 ° C. In this low temperature environment, carbon monoxide gas is slowly and evenly introduced. The carbon monoxide gas also needs to be purified in advance to remove impurities such as carbon dioxide and water vapor. When the gas is introduced, it is necessary to pay close attention to the changes in the reaction system, and the stirring should not stop, so that the carbon monoxide can be fully contacted with the substances in the system.
With the introduction of carbon monoxide, the reaction occurs gradually. There are color changes in the visible system, which is a characterization of the reaction process. Continue to introduce carbon monoxide gas until the reaction reaches the end point. The end point can be judged by various means, such as observing that the reaction system no longer absorbs carbon monoxide gas, or by means of instrument analysis, detecting that the amount of product generated does not increase.
After the reaction is completed, the product is carefully separated from the reaction system. The commonly used method is vacuum distillation, by reducing the pressure of the system, the substances with low boiling points are first volatilized and removed, and the product is retained. Then the product is recrystallized with a suitable organic solvent to further purify the product, and pure iron pentacarbonate diacetonitrile (ⅱ) can be obtained. In this process, the choice of organic solvent is very critical, and it is necessary to choose reasonably according to the solubility of the product. Common organic solvents include ether and n-hexane. After recrystallization, the product is properly stored in a dryer to prevent it from reacting with water vapor, oxygen and other substances in the air.

This is the land of water, the land bordering the sea, where the dinoflagellates work, and where the city is, and where the world is cut.
The origin of dinoflagellates is also the soil near the sea. The water is clear and the light is sufficient, which is a good foundation for the reproduction of dinoflagellates. In the beginning, the people are scarce and the skills are not refined, so the dinoflagellates are not available for the nearby people, and they are used for the food of the dinoflagellates, or the materials of the materials.

The quality of the dinoflagellates, or seek the effect of its life, or use it for the research of the world. As a result, the city of dinoflagellates is prosperous every day. The business of the four sides, and those who seek help will not be able to do so. The price is also rising, and things that used to be like grass and mustard in the past have multiplied in the body today.
However, the prosperity of the market is not enough, and there is also a problem. The city's pursuit of profit is not good, or it is not its own, and the fishing is not good, causing the growth of dinoflagellates to be unbalanced. Or there are those who are shoddy, who deceive customers and merchants, and the order of the city. And the sea's borders are also affected by the situation. If there is a storm or epidemic, the amount of dinoflagellates will inevitably be lost.
So, the current dinoflagellate market is not prosperous on the surface, but it is not as rich as it is. The craftsman wants to thrive for a long time, and he will use the letter to collect the original, improve his life, and improve his skills. Only by using the situation of the craftsman can he ensure the safety of the craftsman and the health of the city.

Although there is no direct record of the relevant content of "5% neon-2-crooked ethanhydrazine" in "Tiangong Kaiwu", from the perspective of chemical material safety, it can be compared to the precautions for material characteristics and operation specifications in traditional processes.
First, the cognition of material characteristics. In the ancient process, the properties of the things used must be carefully inspected. This "5% neon-2-crooked ethanhydrazine", when its physical properties, such as color, state, taste, and melting boiling point, if it is volatile, it should be well ventilated in the operation place to prevent its accumulation and risk. Just like the ancient alchemy, ink making and other processes, for volatile materials, an open and ventilated place is often selected. In addition to its chemical properties, if it is flammable, oxidizing, corrosive, etc., more caution is required. Those who are flammable should stay away from fire and heat sources to prevent ignition and explosion, such as saltpeter and sulfur used in gunpowder in ancient times, and attach great importance to its fire prevention; those who are corrosive should not come into contact with corrosive objects, and there should be protection during operation, similar to ancient metallurgy, dealing with corrosive fluxes, and special leather goods and other protection.
Second, in terms of operation specifications. When taking it, when it is accurately measured, it cannot be increased or decreased at will. Ancient pharmaceuticals and brewing have strict requirements on the ratio of materials, mostly "two degrees in baht". The same should be true for this chemical substance. The accurate amount is related to subsequent reactions and safety. During the reaction process, strict temperature control and pressure control. Ancient porcelain firing and ironmaking have exquisite control over heat and furnace pressure. If this substance reacts under specific conditions, improper temperature and pressure will easily cause the reaction to go out of control and cause danger.
Third, storage management. Appropriate places should be selected. If it is afraid of light, it should be stored in a dark place, just like some ancient medicinal materials hidden in a dark room. If it is afraid of moisture, it needs a dry environment, similar to ancient salt, alkali and other moisture-proof storage. And the storage place should be clearly marked to prevent misuse, just like the ancient warehouse marked different materials.
Fourth, personnel protection. Those involved in the operation, in front of protective equipment, such as gloves, masks, etc., to protect against possible hazards, just like the ancient miners and kiln workers, often use simple protection to deal with harsh environments. And operators should be familiar with relevant safety knowledge and emergency methods. In case of emergencies, they can respond quickly to ensure their own and surrounding safety.