Hydrogen arsenide (AsH₃)

Hydrogen arsenide (AsH₃)

Highly toxic, colorless gas with a garlic-like odor; is produced, among other things, when alloys containing arsenic come into contact with acids.

Can be measured with:

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Hydrogen arsenide (AsH₃)

Origin/occurrence:

In semiconductor processes, electrolysis, pickling of metals with arsenic impurities or in phosphoric acid production.

Limit values:

Very low occupational exposure limits (ppb-low ppm depending on country); short-term exposure limits are strict.

Consequences of high concentrations:

Hemolytic poison; headache, nausea, hemolysis, kidney failure, potentially fatal.

Special features:

Sense of smell unreliable; continuous gas warning and emergency plan (evacuation, respiratory protection) essential.

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