Radon (Rn) in Water Treatment
Quick Answer
Radon (Rn) is a noble gas with atomic number 86. PubChem lists its standard state as gas and its relative atomic mass as 222.01758.
Radon is a radioactive dissolved gas that can occur in groundwater. Aeration or granular activated carbon may reduce it, but off-gas and spent-media radiation risks require specialist design.
Interesting Facts
- Radon is a noble gas, yet every isotope of it is radioactive; radon-222 is produced in the uranium-238 decay chain.
- Its gas form makes treatment unusual: aeration can move radon from water into air, so safe off-gas discharge is part of the process—not an afterthought.
- Radon decays rather than remaining indefinitely, but its short-lived decay products can attach to airborne particles.
Water-treatment Design Implications
An element name alone is not enough to select treatment equipment. Confirm chemical form or speciation, total and dissolved concentration, pH, alkalinity, competing ions and the product-water target. Send the water-analysis results to Watermart to identify additional testing and shortlist processes before equipment is specified.
Summary Data Sources
Practical Reference for a Water Analysis
Sample without losing the gas. Use a laboratory method and sealed sampling procedure suited to dissolved gases. Headspace, agitation, temperature, and holding time can change the result before the sample is analysed.
Validate treatment on the actual matrix. A process name is not a performance guarantee. Competing ions, organic ligands, redox conditions, pH, suspended solids, and required recovery can change removal sharply. Use bench or pilot testing for unusual industrial streams, and make a mass balance for concentrate, sludge, regenerant, or spent media.
Treat residuals as part of the design. A separator concentrates rather than destroys a radionuclide. Determine monitoring, worker-protection, transport, storage, and disposal requirements with the relevant Indonesian authorities and a qualified radiological specialist.