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Selectivity of the H-AuNS probe in the presence of HCl/Au(III)/H2O2 solution toward Hg(II) ions. The Hg(II) concentration was 1.0 μM, and the concentration of each of the other metal ions was 10 μM. Inset: photographs of the H-AuNS probe with different metal ions in the presence of HCl/Au(III)/H2O2 solution. Error bars represent standard deviations from three repeated experiments.
