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Gas risks

How the human body reacts to an oxygen deficiency

Comment le corps humain réagit à une carence en oxygene

Effects of carbon monoxide (CO) on the human body

Concentration (ppm) Effects and Toxicity
100 No noticeable effect even after breathing for a few hours
200 A slight headache in about 1.5 hours.
400-500 Headache, nausea and ringing in the ear in about 1 hour.
600-1000 Loss of consciousness in about 1 to 1.5 hours.
1500-2000 Headache, dizziness and disabling nausea in about 0.5 to 1 hour and loss of consciousness.
3000-6000 Headache, dizziness, disabling nausea … etc. in a few minutes. Exposure of 10 to 30 minutes can result in death.
10000 Causes immediate loss of consciousness and death.

Properties and dangers of combustible gases (iso-butane: i-C4H10)

Main properties Transparent compressed liquid with a distinctive smell

Solubility in water Insoluble
Specific gravity 0.6
Melting point -160oC
Boiling point -12oC
Inflammation point 460oC
Dangers and Toxicity
Ignitibility and explosiveness Generates an explosive gas in the air. Explosive range – 1.8% – 8.4%
Physical effects A suffocating gas with a hypnotic property.
Breathing air containing the gas for 30 minutes leads to a state of discouragement and depression.

Effects of hydrogen sulphide (H2S) on the human body

Concentration (ppm) Effects and Toxicity
0.025 Vague smell (this varies depending on the individual.)
0.3 Clear smell
3/5 Feel a moderate degree of unpleasant smell.
10 First level of irritation of the mucous membranes of the eyes.
20-40 A strong smell. First level of irritation of the mucous membranes of the lungs.
100 The sense of smell is altered in 2 to 15 minutes. The eyes and airways are irritated in 1 hour. Continuous exposure of 8 to 48 hours can result in death.
170-300 A one-hour exposure is the limit so as not to cause serious health problems.
400-700 Potentially lethal exposure in 0.5 to 1 hour.
800-900 Causes a loss of consciousness, a stop of breathing and death.
1000 Causes immediate loss of consciousness and death.

Properties and dangers of combustible gases (methane: CH4)

Main properties Transparent, no gas odor.

Water soluble Slightly water-soluble. Ethanol and other soluble
Gravity
Specific
0.6
Melting point -182.5oC
Boiling point -161.5oC
Inflammation point 537oC
Dangers and Toxicity
Ignitibility and explosiveness Generates an explosive gas in the air. Explosive range – 5.0% – 15.0%
Physical effects A suffocating gas with a hypnotic property.

Breathing air containing the gas for 30 minutes leads to a state of discouragement and depression.

 

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