Derek Wolfe1, Claire E. Lazo-Miller1, John N. Richardson1, Shannon Verissimo2, and Isabelle Lagadic2. (1) Shippensburg University of Pennsylvania, Shippensburg, PA, (2) University of Connecticut, Storrs, CT
We report a simple, inexpensive, and compact attenuated total reflectance optical sensor for determination of Pb2+ that employs thiol-functionalized organoclay films as the sensing medium. Detection of Pb2+ arises from formation of a colored complex, PbSx, that is formed when Pb2+ is pre-concentrated into the film. The sensor demonstrates a linear response greater than two orders of magnitude with an un-optimized detection limit of 200 ppb Pb2+ in solution.
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