The diluted samples and calibration standards were sequentially sampled using an ESI-SC FAST autosampler (Elemental Scientific, US) and introduced to the HR-ICP-MS with a PTFE Nebulizer (Elemental Scientific, US) and cyclonic spray chamber (Thermo Scientific). Ti and Ga 71 were measured in medium resolution mode. The counts per second (cps) data for Ti 47 cps were normalized to Ga 71 cps and calibration curves plotted in Microsoft Excel.