Fig. 2From: Low-level 226Ra determination in groundwater by SF-ICP-MS: optimization of separation and pre-concentration methodsAG-50W-X8 elution profiles for Ca, Mg, Ba, Sr, and Ra. The corresponding solutions were collected every 2 mL. Bar amplitudes were expressed in arbitrary units obtained as signal ratio between the volume fraction collected and the original sample, weighted for the relevant volumesBack to article page