hydrogen sulfide
LowTechnical/Scientific
Definition
Meaning
A colourless, toxic, flammable gas with the characteristic foul odour of rotten eggs, with the chemical formula H₂S.
A compound formed from hydrogen and sulfur, often occurring naturally in volcanic gases, petroleum, and natural gas, and produced by bacterial decomposition of organic matter. It is significant in industrial processes and environmental science.
Linguistics
Semantic Notes
Primarily a technical/scientific term. In everyday contexts, the smell is often referred to as "like rotten eggs" or "sulphurous" rather than by the compound's name.
Dialectal Variation
British vs American Usage
Differences
Spelling: 'sulfide' is standard in American English; 'sulphide' is the standard British English spelling. The word 'hydrogen' is always spelt the same.
Connotations
Identical technical and hazard-related connotations in both varieties.
Frequency
Equally low-frequency in both varieties, used almost exclusively in technical/scientific/industrial/health & safety contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
[Subject: bacteria/process] + produce(s) + hydrogen sulfide[Subject: area/well] + contain(s) + hydrogen sulfide[Subject: sensor] + detect(s) + hydrogen sulfideVocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “No common idioms feature this technical term.”
Usage
Context Usage
Business
Discussed in risk assessments, safety reports, and environmental compliance documents for industries like oil & gas, wastewater treatment, and mining.
Academic
A key topic in chemistry, environmental science, geology, and chemical engineering papers and textbooks.
Everyday
Rarely used. A person might say, "It smells like hydrogen sulfide in here" if they are scientifically inclined, but more likely "It smells like rotten eggs."
Technical
The primary register. Used precisely to describe a specific chemical compound, its properties, hazards, measurement, and removal in technical manuals, safety data sheets, and scientific discussions.
Examples
By Part of Speech
verb
British English
- The groundwater can hydrogen sulphide the surrounding rock over time. (rare/technical verbal use)
American English
- The process is designed to hydrogen sulfide the catalyst. (rare/technical verbal use)
adjective
British English
- The hydrogen sulphide concentration was alarmingly high.
- A hydrogen-sulphide-rich atmosphere.
American English
- The hydrogen sulfide monitor started beeping.
- Hydrogen-sulfide-related fatalities.
Examples
By CEFR Level
- This bad smell is like hydrogen sulfide.
- Hydrogen sulfide is a dangerous gas that smells like rotten eggs.
- Safety protocols require monitoring for hydrogen sulfide in confined spaces like sewers.
- The anaerobic digestion of organic matter in the sediment produced significant quantities of hydrogen sulfide, leading to hypoxic conditions.
Learning
Memory Aids
Mnemonic
Think of a HYDRogen bomb that makes you SULK and want to HIDE because of the terrible rotten egg smell – Hydrogen SULfide.
Conceptual Metaphor
POISON/AIR ("the invisible poison", "deadly air"), ROT/DECAY (the smell metaphorically represents decay and danger).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not translate as "водородная сера" (hydrogen sulfur). The correct Russian term is "сероводород" (síerovodorod).
- The spelling difference sulfide/sulphide mirrors the Russian cognate choice between "сульфид" and "сульфид" (both used, but the 'f' spelling is more modern/international).
Common Mistakes
- Misspelling as 'hydrogen sulphate' (which is a different compound, H₂SO₄).
- Incorrect pronunciation: /haɪˈdrɒdʒən/ instead of /ˈhaɪdrədʒən/.
- Using it as a countable noun (e.g., 'a hydrogen sulfide') – it is a mass noun.
Practice
Quiz
What is the most characteristic property of hydrogen sulfide that aids in its initial detection?
FAQ
Frequently Asked Questions
No, they are different compounds. Hydrogen sulfide is H₂S and smells like rotten eggs. Sulphur dioxide is SO₂, has a sharp, pungent smell, and is a primary product of burning sulphur or fossil fuels.
It is highly toxic, affecting the respiratory system and cellular respiration. At high concentrations, it can cause rapid loss of consciousness and death. It is also flammable.
It is found in volcanic gases, natural gas, crude petroleum, hot springs, and is produced by the bacterial breakdown of organic matter in oxygen-poor environments like swamps, sewers, and manure pits.
Through industrial processes like 'sweetening', which often involves amine gas treating or other scavenging systems that chemically remove the H₂S to prevent corrosion and meet safety standards.