What are the hazards of carbon dioxide?

The density of carbon dioxide is higher than that of air. It is harmless to the human body when it is small, but it will affect people's breathing when it exceeds a certain amount, because the concentration of carbonic acid in the blood increases and the acidity increases, resulting in acidosis.

When the volume fraction of carbon dioxide in the air is 1%, I feel sultry, dizzy and palpitation; 4%-5% will feel dizzy. More than 6% will make people lose consciousness and gradually stop breathing and die.

Because carbon dioxide is heavier than air, its concentration is higher in low-lying areas. When digging a well or digging a pile by hand, people at the bottom of the well will suffocate if the ventilation is not good.

CO？ The normal content is 0.04%, when co? When the concentration reaches 1%, people will feel stuffy, dizzy and palpitation. When the concentration reaches 4%~5%, people will feel asthma, headache and dizziness. When the concentration reaches 10%, people will be seriously delirious, causing people to lose consciousness, lose consciousness and stop breathing and die. Substances to be avoided:

1, various metal dusts (such as magnesium, zirconium, titanium, aluminum and manganese): When suspended in carbon dioxide, it is easy to ignite and explode.

2. Water: Carbonic acid will be formed.

Coma and brain hypoxia caused by inhaling high concentration of carbon dioxide, generally, when the carbon dioxide content in the atmosphere exceeds 65438 0%, people will have mild dizziness; When it exceeds 3%, dyspnea begins to appear; When it exceeds 6%, it will cause severe hypoxia, suffocation and even death.

Extended data:

First, symptoms of excessive inhalation:

The main symptoms are headache, dizziness, tinnitus, shortness of breath, chest tightness, fatigue, rapid heartbeat, cyanosis of cheeks, irritability, delirium and dyspnea. If this situation continues, there will be drowsiness, apathy, coma, loss of reflex, dilated pupils, incontinence, blood pressure drop and even death.

When the concentration of carbon dioxide reaches above 1%, it will make people dizzy. When it reaches 4~5%, people will feel sick and vomiting, and they will not breathe well. If it exceeds 10%, people will die.

Carbon dioxide is outdoor global warming; One of the chief culprits of global warming, the indoor influence on human health and the worry about driving safety are one of the main reasons that cannot be ignored.

In life, carbon dioxide is a gas that human beings make all the time, but it is often ignored. 2 1 In the new century, with the change of people's lifestyle, especially the modern people's fear of noise and poor outdoor air quality, people seek to isolate noise in living space or office space and enjoy the comfort and convenience brought by air conditioning system.

Indoor windows are sealed for a long time, which makes the indoor carbon dioxide concentration much higher than the outdoor average. There are even medical reports that sleeping in an air-conditioned room for eight hours in a row is conducive to the breeding of dust mites because of sufficient air convection, and there will be symptoms of "sick building syndrome" such as stuffy nose and itchy skin in the morning.

The concentration of carbon dioxide will affect people's life and rest. The relationship between the concentration of carbon dioxide and people's physiological reaction is as follows:

1, 350 ~ 450 ppm: same as general outdoor environment.

2, 350 ~ 1000 ppm: fresh air and smooth breathing.

3、gt； 10000 ppm: I felt the air was turbid and began to feel sleepy.

4、gt； 20,00ppm: Feeling headache, drowsiness, lethargy, inattention, rapid heartbeat and mild nausea.

5、gt； 50,50,00 ppm: It may cause severe hypoxia, resulting in permanent brain damage, coma and even death.

Second, the first aid measures:

1, open doors and windows, ventilation holes, and rescuers can enter. After the rescue, the patients were given artificial respiration, heart massage, fresh air oxygen inhalation (avoiding high pressure, large flow and high concentration of oxygen, so as to avoid greater inhibition of the respiratory center), starting with 1 ~ 2L/ min, and gradually increasing the oxygen supply (4-5L/ min) with the improvement of patients' breathing, and even adopting hyperbaric oxygen treatment. (Preferably pure oxygen)

2. Inhalation of stimulants: A variety of stimulants are used alternately, such as Lobelin and Lobelin.

3. Prevent brain edema and pulmonary edema: Use dehydrating agents and hormones to limit the amount and speed of liquid, and the amount of sodium inhaled should also be limited.

4, symptomatic treatment: give a variety of vitamins, cytochrome C, energy mixture, hypertonic sugar to prevent infection.

5, rescue at the same time should pay attention to the presence of other toxic gases, such as carbon monoxide.

References:

Baidu encyclopedia-carbon dioxide