The separation of strontium from other alkaline earth elements and alkali metal elements is necessary for precise strontium
isotope measurement in natural samples. The adsorption behavior of alkaline earth elements on tertiary pyridine resin was
investigated using the methanol/nitric acid mixed solution, and the feasibility of strontium separation was studied. We found
that strontium can be completely separated from other alkaline earth elements and alkali metal elements using the tertiary
pyridine resin. The extraction of strontium from coral sample was demonstrated.