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. 2013 Oct 9;1:20. doi: 10.3389/fchem.2013.00020

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Copyright © 2013 Wang, Lin, Roy and Chang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) Sensitivity and (B) selectivity of the SERS approach for Hg²⁺. Concentrations: 100 nM for Hg²⁺ and 1 μM for the other metal ions. Reaction time was 10 min and pH value was 4.0. The other conditions are the same as in Figure 2.