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Gold nanoparticles functionalized with 4-mercaptobenzoic acid can selectively capture Hg 2+ in the presence of 2,6-pyridinedicarboxylic acid, generating a fingerprint surface-enhanced Raman scattering (SERS) peak at 374 cm −1 . This SERS sensor exhibits a limit of detection of 5 ppt toward Hg 2+ in water.
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Zheng et al. (2017) studied this question.
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