Is there such a thing as anoxia poisoning?

This post was last edited by eleg on 2009-8-27 at 10:40. Yes, the oxygen concentration must not exceed a certain level; high concentrations can cause poisoning. Ordinary people will suffer from poisoning if they are exposed to oxygen levels above 40% for an extended period of time. The symptoms include an accelerated heart rate, rapid breathing, and discomfort in the area behind the breastbone. In severe cases, it can lead to heart failure and death.

That’s right; high oxygen concentrations can also cause poisoning.

The last edit to this post was made by lldbca6305 on 2009-8-26 at 21:13. Regarding oxygen poisoning, the only things that come to mind are medical hyperbaric chambers; there’s also what might be called the “plainland reaction.” It’s the opposite of altitude sickness. I’ve never heard of it in engineering contexts, as the critical value is too high – generally, it seems impossible to reach such a level

For infants and young children, excessive oxygen supply can cause blindness.

Oxygen – Composition information; Hazardous components and their concentrations; CAS No.: Oxygen ≥99.99%; 7782-44-7. Hazard overview: Hazard category: Class 2.2, non-flammable gas. Routes of exposure: Inhalation. Health hazards: At normal pressure, oxygen poisoning can occur when its concentration exceeds 40%. When inhaling 40%–60% oxygen, discomfort behind the sternum and mild coughing occur, followed by chest tightness, a burning sensation behind the sternum, and difficulty breathing, with the cough worsening ； In severe cases, pulmonary edema can occur, and even respiratory distress syndrome may develop. When the inhaled oxygen concentration exceeds 80%, facial muscle twitching, pale complexion, dizziness, tachycardia, and collapse occur, followed by generalized tonic convulsions, coma, respiratory failure, and death. Prolonged exposure to an oxygen partial pressure of 60–100 kPa (corresponding to an inspired oxygen concentration of about 40%) can cause eye damage, and in severe cases, blindness may occur. Environmental hazards: Flammability and explosion risk: This product acts as an accelerant for combustion. First aid measures: Skin contact: Eye contact: Inhalation: Immediately move to a place with fresh air. Keep the airway clear. If breathing stops, perform artificial respiration immediately. Seek medical attention. Ingestion: Preventive measures. Hazardous properties: It is a flammable substance; one of the basic elements for combustion and explosion, and it can oxidize most reactive substances. It forms explosive mixtures with flammable substances such as acetylene and methane. Harmful combustion products: Extinguishing method: Use water to keep the container cool in order to prevent it from exploding due to heat, which could intensify the fire. Quickly cut off the gas supply, use water to protect the personnel performing the cutoff, and then select an appropriate extinguishing agent to put out the fire based on its cause.

Citing online sources: As early as the mid-19th century, British scientist Paul Bert was the first to discover that exposing animals to pure oxygen could cause poisoning, and the same is true for humans. When a person is in an environment with pure oxygen at a pressure greater than 0.05 MPa (half an atmosphere), it is toxic to all cells; prolonged exposure can lead to \"oxygen poisoning\". The pulmonary capillary barrier is damaged, leading to pulmonary edema, pulmonary congestion, and bleeding, which severely impairs respiratory function and subsequently causes hypoxia and damage to various tissues. In a pure oxygen environment at 0.1 MPa (1 atmosphere), a human can survive for only 24 hours before developing pneumonia, which ultimately leads to respiratory failure and death by asphyxiation. A person can remain in an environment of high-pressure pure oxygen at 0.2 MPa (2 atmospheres) for up to 1.5 to 2 hours; exceeding this time limit can cause brain poisoning, disruption of the body’s vital functions, mental confusion, and loss of memory. If oxygen at a pressure of 0.3 MPa (3 atmospheres) or even higher is introduced, human brain cells will undergo degeneration and necrosis within minutes, leading to convulsions, coma, and death. Furthermore, excessive oxygen intake can also accelerate the aging of living organisms. Oxygen that enters the body reacts with oxidases in cells to produce hydrogen peroxide, which then turns into lipofuscin. This lipofuscin is a harmful substance that accelerates cellular aging; it accumulates in the heart muscle, causing the heart muscle cells to age and leading to a decline in cardiac function ； It accumulates on the blood vessel walls, causing the vessels to age and harden ； It accumulates in the liver, weakening its function ； It accumulates in the brain, causing a decline in intelligence, memory loss, and leading to dementia ； It accumulates on the skin, forming age spots.

The theory of oxygen toxicity does exist. But as the original poster said, it’s not necessary to consider oxygen poisoning in design projects, in my opinion

There is such a thing as aerobic toxicity, such as the emission of oxygen-enriched air from air separation units. But generally, there’s no need to consider it, right?

:) I think this \"oxygen toxicity\" is caused by the adverse effects of an oxygen-rich environment on the body’s physiological functions, even if it results from an accelerated metabolism. Too much is as bad as too little; that’s the truth behind it

There is a saying that newborns placed in incubators are most at risk of oxygen toxicity, which can lead to severe blindness.