Radium (Ra) in Water Treatment

Quick Answer

Radium (Ra) is an alkaline earth metal with atomic number 88. PubChem lists its standard state as solid and its relative atomic mass as 226.02541.

Radium is a naturally occurring radionuclide found in some groundwater. Ion exchange, lime softening, adsorption and reverse osmosis can reduce it, but residuals may become regulated radioactive waste.

Interesting Facts

• Radium was isolated through painstaking work on uranium ore; its name comes from the Latin radius, meaning “ray.”
• Dissolved Ra²⁺ chemically resembles calcium and barium. That resemblance helps explain both its uptake by bone and why softening or cation exchange can capture it.
• Treatment does not destroy radioactivity: it transfers radium into brine, sludge, or spent media that may require radiological controls.

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

• PubChem — Radium
• IUPAC Periodic Table of Elements
• US EPA — Radionuclides Rule

Practical Reference for a Water Analysis

Identify the isotope and reporting basis. Elemental concentration, gross radioactivity, and isotope-specific activity are not interchangeable. Confirm whether the target is stable or radioactive and whether the result is reported as mass per volume or activity per volume.

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.