This hot article describes highly sensitive ferrocene-based chemosensors, capable of detecting both lead and mercury:
Ferrocene-based multichannel molecular chemosensors with high selectivity and sensitivity for Pb(II) and Hg(II) metal cations
María Alfonso, Alberto Tárraga and Pedro Molina, Dalton Trans., 2010, Advance Article
DOI: 10.1039/C0DT00450B
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