Performance assessment of TK100 resin for rapid and selective radium retention from environmental waters

The performance of TK100 resin was evaluated for the rapid and selective preconcentration of 226 Ra for environmental water matrices. High radium uptake was observed in 0.01 M HNO 3 and 0.01 M HCl, with weight distribution ratio above 1000 mL·g −1 , and > 95% retention achieved within 15 min. Adsorption decreased significantly at ≥ 0.1 M HNO 3 and 0.1 M HCl, with D w values decreasing from the order of 10 3 to 10 mL·g −1 . A similar decline was observed at high salinity, defining the operational matrix limits. Column tests confirmed that > 90% of 226 Ra was eluted with 10–15 mL of 0.1 M acid (HNO 3 , HCl). These findings demonstrate the suitability of TK100 for routine preconcentration of 226 Ra in routine environmental monitoring.