Why Ban Naphthalene Mothballs

2023-04-27

Naphthalene is a toxic chemical, and the use of mothballs containing it has been banned or restricted in many countries. Here are some reasons why naphthalene mothballs are banned: Health hazard: Naphthalene mothballs may emit toxic odors and cause health hazards to humans, including headaches, dizziness, nausea, vomiting and coughing. Long-term exposure to the smell containing naphthalene mothballs can cause serious nervous system problems, liver damage and health problems such as cancer. Environmental pollution: Naphthalene in naphthalene mothballs can evaporate into the air along with the smell, contaminating indoor and outdoor environments. Naphthalene mothballs can also cause soil and water pollution. Animal hazard: Naphthalene mothballs are a toxic substance that can be harmful to pets and wildlife. Consuming naphthalene mothballs can lead to animal poisoning and other health problems. As a result, many countries have banned or restricted the use and sale of naphthyl-containing mothballs. When choosing a pest control agent, it is recommended to choose an alternative that does not contain naphthalene to protect your health and the environment. There are two kinds of mothballs on the market now, one is natural camphor powder, and the other is synthetic camphor. Natural camphor powder is a kind of natural substance extracted from camphor tree. Synthetic camphor is a chemical synthesis of compounds, similar to the chemical structure of natural camphor powder, but it contains higher volatility and toxicity. Currently marketed mothballs may use natural camphor powder or synthetic camphor as the main ingredient. However, with the increase of people's awareness of environmental protection and health, more and more manufacturers began to use natural camphor powder as raw material to produce camphor balls, in order to avoid the possible health and environmental risks of synthetic camphor. Therefore, if you want to purchase mothballs, please choose products labeled with the use of natural camphor powder as the main ingredient, and follow the correct usage methods when using to reduce the possible health and environmental risks of mothballs. a list of countries where the sale of mothballs is either prohibited or regulated: 1.European Union: The use of naphthalene-based mothballs is banned throughout the European Union. 2.Canada: The use and sale of naphthalene-based mothballs are prohibited in Canada. 3.United States: The Environmental Protection Agency (EPA) regulates the use and sale of mothballs in the United States. Mothballs containing naphthalene are classified as pesticides and are only available to licensed pesticide applicators. 4.Australia: The use of naphthalene-based mothballs is prohibited in Australia. Camphor-based mothballs are available for sale but are subject to labeling requirements. 5.Japan: The use and sale of naphthalene-based mothballs are prohibited in Japan. Please note that this information may be subject to change, and regulations may vary by region or state within a country. It's always a good idea to check with your local authorities for the latest regulations on mothballs.
The Use Of Camphor

2023-04-27

The use of camphor Camphor is a white crystalline substance with a strong aroma that comes from the wood of the camphor tree. It has a variety of uses, including: 1.Medical Uses: Camphor is used in some medical products as a pain reliever and as a remedy for coughs and colds. It can also be used topically to treat skin conditions such as eczema, itching, and fungal infections.In addition, camphor has certain functions such as enlightening the body and waking up the spirit, removing impurities and turbid, and warming powder to relieve pain; Side effects: excessive use of camphor can cause dizziness, headache, and even excessive excitement, delirium, and even epileptic convulsions, and then can cause respiratory failure leading to death, so special attention should be paid to the use of camphor under the strict guidance of the doctor, do not use without authorization. 2.Aromatherapy: Camphor oil is used in aromatherapy to help with respiratory issues, mental clarity, and relaxation. It is often added to diffusers or applied topically in small amounts. 3.Insect repellent: Camphor can be used as an insect repellent, particularly against moths and other insects that damage clothing or stored goods. It can also be used as a mosquito repellent. 4.Cleaning agent: Camphor can be used as a cleaning agent for household items such as silverware, copper, and brass. It is also an effective way to remove stains and marks from wood surfaces. 5.Food additive: In small amounts, camphor is used as a flavoring agent in some food products. However, it should be used sparingly as high doses can be toxic. 6.Industrial uses: Camphor is used in the production of plastics, explosives, and synthetic fibers. It's worth noting that camphor is toxic in high doses and can cause adverse reactions in some people. It should be used in moderation and under the guidance of a healthcare professional or trained aromatherapist.
Health Effects Of Camphor

2023-04-27

White powdery crystal
Methods For Neutralizing Hydrofluoric Acid！

2023-04-20

Hydrofluoric acid is a toxic chlorinated hydrocarbon that contains fluorine atoms. Since the 1930s, hydrofluoric acid has been widely used as a halogen solution for degradable pesticides. Because hydrofluoric acid is volatile and easily absorbed, its presence in the air can harm human health.Hydrofluoric acid neutralization is an important means of hydrofluoric acid treatment. Hydrofluoric acid neutralization technology includes: activated carbon adsorption neutralization, solvent extraction neutralization, ion exchange neutralization, ion modification neutralization and non-ion modification neutralization.Activated carbon adsorption neutralization is the use of activated carbon adsorption, the hydrofluoric acid from the water neutralization. This method is economical and easy to use, but its selectivity is poor, can not effectively remove organic matter and other inorganic ions, and activated carbon has a high resistance to hydrofluoric acid, so that activated carbon is difficult to be neutralized.Solvent extraction neutralization is the continuous extraction of hydrofluoric acid between aqueous solution and solvent to achieve neutralization. The advantage of solvent extraction neutralization technology is that it has low resistance to agent and can well remove organic ions in ammonia, nitric acid and other solutions. However, its disadvantage is that solvent extraction generally requires certain temperature and pressure conditions, so the extraction efficiency is low.Deion exchange neutralization is the realization of hydrofluoric acid neutralization by using the ion exchange properties of ion exchange resin by exchanging ions from water. The advantage of ion exchange neutralization technology is that it is highly selective and can effectively remove ammonia, nitric acid, heavy metal ions, etc., but the disadvantage is that the neutralization efficiency is limited by the reaction ability of ion exchange resin, so the reaction time is long and the energy is consumed.The neutralization of ion modification technology is to utilize the principle of ion modification to adsorb ions to the modifier and make it become insoluble compounds to achieve the neutralization of hydrofluoric acid. The neutralization of ion modification technology has the advantages of good selectivity, effective removal of ammonia, nitric acid, etc., and the reaction speed is fast, but the disadvantage is that its reaction capacity is affected by the modifier, which consumes a large amount of energy.Nonionic modification technology neutralization is the use of polymer structure surface, hydrofluoric acid adsorption on the surface, to achieve neutralization. In addition, the non-ionic modification technology can also use the structure to fix hydrofluoric acid on the polymer surface to form hydrofluoric acid polymer complex, which can also realize the neutralization of hydrofluoric acid.For the neutralization technology of hydrofluoric acid pollution, the above several hydrofluoric acid neutralization technologies have their own advantages and disadvantages. Different technologies can be used separately or combined according to the specific situation. There has never been a universal solution for hydrofluoric acid neutralization technology, and a single technology may not be able to effectively deal with pollutants. It must be analyzed and selected on a case-by-case basis to achieve neutralization standards as required.The treatment of hydrofluoric acid pollution is very important, but its treatment is a whole process, including pollution detection and monitoring, source control, and neutralization. As an important link of pollution control, hydrofluoric acid neutralization can effectively reduce the pollution of hydrofluoric acid. Hopefully, through this neutralization technology, water quality can be restored and our environment can be protected.
How Toxic Hydrofluoric Acid Is?

2023-04-20

Hydrofluoric acid (HF) is highly toxic and corrosive, and exposure to it can be very dangerous. The toxicity of hydrogen fluoride is due to its ability to penetrate the skin and underlying tissues and react with calcium in the body, resulting in the formation of insoluble calcium fluoride, which damages internal organs and causes systemic toxicity.Inhalation of HF vapor can cause severe respiratory injury, and skin exposure can result in severe burns that may require amputation. Even small amounts of exposure to hydrogen fluoride can be life-threatening, and if someone comes into contact with this acid, immediate medical attention is required.HF is also highly reactive and can cause explosions or fires when it comes into contact with certain substances, such as water, metals, and organic compounds.Hydrofluoric acid is a highly toxic chemical, common liquid hydrofluoric acid and hydrofluoric acid vapor, contact with both will cause certain harm to the human body, but there are some differences, need to be specific analysis of specific problems.If it is contact with liquid hydrofluoric acid, the harm to the human body is mainly manifested in the skin, for example, at the beginning of contact with the skin, there will be skin flushing, dry, pale wound, necrosis, and then appear purple black or gray black, often accompanied by severe pain. Fluoride ions in the late stage of contact with hydrofluoric acid can penetrate the skin and reach deep tissues, which can lead to muscle necrosis in severe cases.If it is contact with hydrofluoric acid vapor, or inhale hydrofluoric acid vapor, the harm to the human body is reflected in the eyes and respiratory tract, such as nose, throat, sternum behind the burning sensation, loss of smell, cough, hoarseness, etc. In severe cases, there are intractable ulcers of nasal mucosa, ocular conjunctiva, oral mucosa, nasal septum perforation, corneal perforation, bronchitis, pneumonia, pulmonary edema, and even reflex asphyxia, respiratory and circulatory failure.In addition, fluoride ions in hydrofluoric acid will combine with calcium ions after invasion into the human body, resulting in decreased blood calcium, hand and foot convulsions, arrhythmia, and even cardiac arrest. Long-term low concentration exposure to hydrofluoric acid will also lead to dental acidosis.In general, HF requires special handling and safety precautions due to its high toxicity and should only be used by trained professionals with appropriate personal protective equipment and emergency response plans. And actively participate in the practitioners of emergency drills, improve the ability to deal with emergencies
Which Acid Is Hydrofluoric Acid?

2023-04-20

Hydrofluoric Acid is an aqueous solution of hydrogen fluoride gas. It is a clear, colorless, smoky, corrosive liquid with a sharp, irritating odor. Hydrofluoric acid (HF) is a strong acid, but it is not the strongest acid. The strength of an acid is typically measured by its ability to donate protons (H+) in water. Hydrofluoric acid is a weak acid compared to other common acids like sulfuric acid (H2SO4), hydrochloric acid (HCl), and nitric acid (HNO3), which are all stronger acids than HF.However, hydrofluoric acid is unique in that it can dissolve certain materials that other acids cannot, such as glass and some metals. This is due to its ability to form strong bonds with silicon and other elements in these materials, which makes it a valuable tool in certain industrial applications.It's important to note that while HF may not be the strongest acid, it is still highly toxic and can be extremely dangerous if not handled properly. It can cause severe burns and tissue damage, and exposure to even small amounts can be fatal. Therefore, it should only be used with extreme caution and under the guidance of trained professionals.When the concentration is low, it is weakly acidic due to the formation of hydrogen bonds, but when it is concentrated (more than 5mol/L), self-ionization will occur. At this time, hydrofluoric acid is a very acidic acid.Liquid hydrogen fluoride is a very acidic acid, similar in acidity to anhydrous sulfuric acid, but weaker than fluorosulfonic acid. [3] Strong corrosion, serious damage to teeth and bones. Highly corrosive to silicon compounds. Store in an airtight plastic bottle.It is obtained by HF (hydrogen fluoride) dissolved in water. It is used for engraving glass, cleaning sand residue on castings, controlling fermentation, electropolishing and cleaning corroded semiconductor silicon wafers (mixed acid with HNO3). Hydrofluoric acid cannot fully ionize in water because hydrogen atoms and fluorine atoms are relatively strong in bonding.Hydrofluoric acid can dissolve many other acids cannot dissolve glass (main component: silica). The reaction equation to produce gaseous silicon tetrafluoride is as follows:SiO2 (s) + 4 hf (aq) = SiF4 (g) write + 2 h2o (l)The resulting SiF4 can continue to interact with excess HF to produce fluosilicic acid:SiF4(g)+2HF(aq)=H2[SiF6](aq), fluosilicic acid is a strong binary acid. Can cause burns that are difficult to cure if inhaled by steam or contact with skin. It is usually made in laboratories with fluorite (the main ingredient is calcium fluoride) and concentrated sulfuric acid. It needs to be sealed in a plastic bottle and kept in a cool place.
A Week To Learn Knowledge Of 100 Q | Hazardous Chemical Materials Safety Management(7)

2023-04-12

Question:What are the principles of emergency rescue for hazardous chemical Accidents?Answer: Immediately organize the rescue and treatment of the victims, evacuate, evacuate or take other measures to protect other persons in the affected area; Quickly control the source of hazards, determine the nature of hazardous chemicals, the hazardous area of the accident and the degree of hazards; In view of the actual harm and possible harm caused by the accident to human body, animals and plants, soil, water source and atmosphere, measures such as closure, isolation and decontamination shall be promptly taken; To monitor and assess the environmental pollution and ecological damage caused by hazardous chemical accidents, and take appropriate measures for environmental pollution control and ecological restoration.
Into Learning The Breathtaking Chemistry The Most Of The World （six）

2023-04-12

14, the most absorbent substanceThe US Agricultural Research and Service announced on 18 August 1974 that a superabsorbent treated with iron could absorb up to 130 times its own weight in water. The substance consists of 50% starch extract, 25% alkene ammonia and 25% acrylic acid. The substance's ability to maintain an equilibrium temperature for long periods of time makes it ideal for repeated use of ice packs, as was demonstrated at a game in Detroit, Michigan, in the United States, where the substance continuously lowered the body temperature of a 14-year-old baseball player.15, the hottest flameBasic carbon nitride produces the hottest flame, with temperatures up to 4988°C at 1 atmosphere of pressure.16, the lowest temperatureAbsolute zero -- the zero opening on the absolute temperature scale -- corresponds to -273.15°C, at which point the molecular heat of all atoms stops. The lowest temperature ever reached is 280 pico, which was generated and announced in February 1993 using a nuclear demagnetization device in the Cryogenic Laboratory at the University of Helsinki, Finland.
The King Of New Materials Is Born! Borene, Which Is Even More Outrageous Than Graphene, Brings These Imaginative Applications

2023-04-12

Because of its excellent electrical, mechanical and thermal properties, Borophene is highly expected by the scientific community, and may become another kind of "magic nanomaterials" after graphene.For much of the past few years, Graphene seemed to be sweeping the science and engineering worlds, hailed as the most disruptive 'king of new materials' and even dubbed the' black gold 'of the materials world. The amazing features and applications that come out of it are eye-opening.Now scientists have applied the same trick to boron, resulting in Borophene, a boron oxide that looks even more exciting than graphene. The "next generation of super nanomaterials" may be on the horizon, but Borophene is considered to have a broader application potential, revolutionizing energy, sensors, catalysts and many other fields.The new material, which also works as a two-dimensional material, is stronger, more flexible, lighter and more chemically reactive than graphene.Borene didn't start in the lab, but in computers: computer simulations suggest that boron oxides may have been created as far back as 1990 to show how boron atoms form monolayers. Starting more than 20 years ago, scientists around the world, using computer simulations, have demonstrated the existence of borene and made predictions about its properties.But it wasn't until 2015 that anyone was able to synthesize it using chemical vapor deposition and use it in a variety of products. In December 2015, scientists from Argonne National Laboratory, Nankai University in China, Stony Brook University in New York, and Northwestern University created the first two-dimensional material made of boron in an ultra-high vacuum. Since then, more and more laboratories have made great progress in synthesizing borene with a thickness of one atom.Since the synthesis of boron oxidation, chemists have been eager to describe its properties. The potential for specific arrangements to produce different properties is one reason chemists are so excited.New research shows that layers of single atoms called boron are more powerful and flexible than graphene and could revolutionize fields such as sensors, batteries and catalytic chemistry.Electrochemists think borosilane could be the anode material for a new generation of more powerful lithium-ion batteries. Physicists are testing its ability as a sensor to detect many types of atoms and molecules.
A Week To Learn Knowledge Of 100 Q | Hazardous Chemical Materials Safety Management(6)

2023-04-06

Question:What is full tank proof?Answer: A storage tank consisting of an inner tank and an outer tank. The inner tank and the outer tank can adapt to the storage of low-temperature frozen liquid, the distance between the inner and outer tanks is 1 ~ 2m, the top of the tank is supported by the outer tank, under normal operating conditions, the inner tank storage of low-temperature frozen liquid, the outer tank can not only store frozen liquid, but also limit the gas emissions produced by the leakage of liquid in the inner tank.

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