Abstract 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.
Gongora et al. (2026) studied this question.