According to national standards for natural mineral water, the selenium content in selenium-enriched water should range from 0.01 to 0.05 mg/kg. GB 8537-2008 stipulates that the limit for selenium content in natural mineral water is ≥0.01 mg/L for selenium-enriched water. The maximum selenium content is ≤0.05 mg/L; otherwise, it cannot be considered natural mineral water for drinking.
In summary, the selenium content in natural mineral water should not exceed 0.05 mg/L, and the selenium content in selenium-enriched mineral water should be between 0.01 and 0.05 mg/L.
