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Left: Speciation analysis of drinking water spiked with 10 ppb of Pb2+. Data points for % of free Pb2+ as a function of the sample pH. Dashed line: Calculated free Pb2+ activity for a total carbonate concentration of 4.14 mM [51]. Right: Comparison of the values obtained by potentiometry at pH 4.0 with ICP-MS measurements [51].
