barium sulfate
C2 (Technical/Specialist)Technical/Scientific/Medical
Definition
Meaning
A white crystalline compound, BaSO₄, insoluble in water, used as a radiocontrast agent in medical imaging and as a white pigment.
In industry, used as a weighting agent in drilling fluids, filler in plastics, and in the manufacture of paints and paper.
Linguistics
Semantic Notes
The term is primarily used in chemistry, radiology, and industrial contexts. In medicine, it is often shortened colloquially to 'barium' when referring to the contrast drink or enema.
Dialectal Variation
British vs American Usage
Differences
Spelling: 'sulphate' (UK) vs. 'sulfate' (US). Pronunciation follows the spelling difference.
Connotations
Identical technical connotations. In everyday UK contexts, the older spelling 'barium sulphate' may still be encountered.
Frequency
Equal frequency in relevant technical fields.
Vocabulary
Collocations
Grammar
Valency Patterns
[Patient] was given barium sulfate[Technician] prepared a barium sulfate suspension[The compound] consists of barium sulfateVocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “None”
Usage
Context Usage
Business
Rare, except in specific industrial supply contexts.
Academic
Common in chemistry, geology, materials science, and medical journals.
Everyday
Virtually never used. A patient might say 'I had to drink that chalky stuff for my scan'.
Technical
The primary register. Precise and necessary in radiology reports, chemical formulations, and industrial specifications.
Examples
By Part of Speech
verb
British English
- The patient will be barium-mealed.
- The gut was imaged after being coated with barium sulphate.
American English
- The radiologist bariumed the patient's colon.
- The technician is preparing to barium-swallow the subject.
adverb
British English
- Not typically used adverbially.
American English
- Not typically used adverbially.
adjective
British English
- The barium sulphate mixture is ready.
- A barium sulphate study was requested.
American English
- The barium sulfate suspension was flavored.
- We reviewed the barium sulfate images.
Examples
By CEFR Level
- The doctor used a special drink for the X-ray.
- Before the stomach X-ray, I had to drink a thick, chalky liquid.
- Barium sulfate is a harmless compound that makes your digestive tract visible on X-rays.
- The insolubility of barium sulfate is crucial to its safety as a radiocontrast agent, preventing absorption into the bloodstream.
Learning
Memory Aids
Mnemonic
Think of a BAR being X-rayed. BARIum is the heavy element that shows up white on the X-ray, and SULFATE is the partner that makes it safe to ingest.
Conceptual Metaphor
A 'revealing cloak' or 'illuminating dust' – it coats internal surfaces, making the invisible visible to X-rays.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid translating 'sulfate' as 'сульфид' (sulfide, S²⁻). The correct term is 'сульфат' (sulfate, SO₄²⁻).
- In medical contexts, the procedure is often called 'рентген с барием' (X-ray with barium), not a direct translation of 'sulfate'.
Common Mistakes
- Misspelling as 'barium sulphide' (BaS, which is toxic and soluble).
- Pronouncing 'barium' as /ˈbær.i.əm/ (like 'bar') instead of /ˈbeə.ri.əm/ (UK) or /ˈber.i.əm/ (US).
- Using 'barium' alone in a formal chemical context where the full compound name is required.
Practice
Quiz
What is the primary reason barium sulfate is used in medical imaging?
FAQ
Frequently Asked Questions
As a pure, insoluble compound, it is non-toxic and safe for medical use. However, soluble barium salts are highly poisonous.
Because it is an insoluble, fine powder suspended in liquid, creating a gritty, chalk-like texture and taste. It is often flavored to improve palatability.
Barium sulfate is the chemical compound. A 'barium meal' or 'barium enema' is the medical procedure using a preparation containing barium sulfate as the active agent.
No. It is only useful for X-ray based techniques (radiography, fluoroscopy, CT). It has no effect on magnetic fields (MRI) or sound waves (ultrasound).