1 ppm = 1 part of gas per million parts of air by volume. H2S levels of 100 ppm and higher are considered immediately dangerous to life and health (IDLH).

Exposure monitoring conducted in the early 1980s showed exposures to 0-20 ppm H2S, 0-15 ppm methyl mercaptan, 0-12 ppm dimethyl sulfide and 0-1.5 ppm dimethyl disulfide.(57) This study is limited by factors such as the lack of control over other potential causes of cardiovascular disease. Eyes/Vision:

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ExxonMobil. Svavelväte. 8 h.

Areas between 500 - 20,000 ppm that have been determined to be high H2S areas using the criteria set forth concentration. Printed On: 04/08/2021 12:09 PM 

HCO3. 0.l°/oo.

99.95 %. Resistenstider: A1, Cyclohexan C6H12, 500 ppm B2, Svavelväte H2S, 1 000 ppm. > 60 min. ≥ 40 min E2, Svaveldioxid SO2, 1 000 ppm. > 30 min.

STEL. 200 ppm.

3658 mg/m3. 1 ppm. 1 ppm.
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In a Finnish study (6), a health   Chart corrected 1/12/2002, due to e-mail from a victim of H2S poisoning. 0.03 ppm. Can smell.

__Yes __ No. < 10 ppm. Carbon Monoxide CO) ppm. (10 ppm) [7]. Page 4 of 12.
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Parts per million can mean "per mass", "per volume", etc., etc. I'll assume you mean ppm(m) - per mass. In order to find the mole % of the H2S content you have to know the total number of moles in the crude oil.

I'll assume you mean ppm(m) - per mass.