At what concentration does hydrogen sulfide become explosive in ppm?

The explosive range of hydrogen sulfide in air is 4.5 to 45.5 percent. This range is much higher than the PEL.

What will happen when hydrogen sulfide oxidizes?

Hydrogen sulfide may oxidize to the sulfate of thiosulfate in certain tissues. Thiosulfate can bind methemoglobin and form sulfmethemoglobin, which autooxidizes. Hydrogen sulfide may also be metabolized by methyolation and/or reactions with metal-containing proteins (metalloproteins).

What will hydrogen sulfide cause at low concentrations?

At low levels, hydrogen sulfide causes irritation of the eyes, nose, and throat. Moderate levels can cause headache, dizziness, nausea, and vomiting, as well as coughing and difficulty in breathing. Higher levels can cause shock, convulsions, coma, and death.

What PPM does h2s stop smelling?

The odor threshold is between 0.008 and 0.13 ppm, and olfactory fatigue, resulting in a lack of detection of odor, may occur at 100 ppm.

What does hydrogen sulfide smell like at low concentrations?

Hydrogen sulfide is a colorless, flammable gas that smells like rotten eggs at low concentration levels in the air. It is commonly known as sewer gas, stink damp, and manure gas.

How hydrogen sulfide is formed?

It is produced when bacteria break down plant and animal material, often in stagnant waters with low oxygen content such as bogs and swamps. Volcanoes, hot springs and underwater thermal vents also release hydrogen sulfide.

What reactions produce hydrogen sulfide?

Many metal and nonmetal sulfides, e.g. aluminium sulfide, phosphorus pentasulfide, silicon disulfide liberate hydrogen sulfide upon exposure to water: 6 H2O + Al2S3 → 3 H2S + 2 Al(OH) This gas is also produced by heating sulfur with solid organic compounds and by reducing sulfurated organic compounds with hydrogen.

At what PPM does eye irritation begin?

10 ppm Beginning eye irritation 50-100 ppm Slight conjunctivitis and respiratory tract irritation after 1 hour exposure. 100 ppm Coughing, eye irritation, loss of sense of smell after 2-15 minutes. Altered respiration, pain in the eyes, and drowsiness after 15-30 minutes followed by throat irritation after 1 hour.

At what ppm is co flammable?

Any circumstances that disrupt optimum air/fuel mixture can result in the production of CO. CO is a colorless, odorless, tasteless and combustible gas with a lower explosive limit (LEL) of 12.5\% or 125,000 parts per million (propane has an LEL of 2.2\% or 22,000 ppm).