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A Mercury Selective Electrode

Published online by Cambridge University Press:  21 March 2011

Jon Scaggs ,
Dale D. Russell ,
S. P. Duttagupta  and
Michael W. Hill
Jon Scaggs
Affiliation:
Department of Chemistry, Boise State University, Boise ID 83725
Dale D. Russell
Affiliation:
Department of Chemistry, Boise State University, Boise ID 83725
S. P. Duttagupta
Affiliation:
Department of Electrical Engineering Boise State University, Boise ID 83725
Michael W. Hill
Affiliation:
Department of Chemistry, Boise State University, Boise ID 83725
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Abstract

A novel mercury ion selective electrode has been constructed to have strongly coordinating macrocyclic ligand binding site covalently attached to polythiophene film using 1-1,4,10-trioxa-7,13-diazacyclopentadecane-1-thiophenylmethane (TDCD-thiophenylmethane) as a specific chelator. In amperometric mode, the current is proportional to mercury (II) concentrations down to 2 ppb. Reversible cyclic voltammetric waves show that both mercury (I) and mercury (II) are stabilized by the ligand. Monomethyl mercury and vapor phase elemental mercury are also electrochemically determined. Dissolved oxygen and heavy metal cations show no significant interference even at ten times the mercury concentration. The polymer surface shows robust performance for two years or longer. Fabrication strategies are being developed to optimize the probe performance. The variables under investigation include substrate surface roughness, the ratio of derivitized thiophene (TDCD-thiophenylmethane) to underivatized thiophene in the surface polymer, ratio of thiophene with two chelating rings to thiophene with only one, number and thickness of electrodeposited polymer layers, composition of polymer layers, and number of -CH2- units separating the chelating ring from the thiophene monomer units. The probe exhibits linear response to mercury concentration, and detects mercury in several forms.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 665: Symposium C – Electronic, Optical and Optoelectronic Polymers and Oligomers , 2001 , C5.2
Copyright
Copyright © Materials Research Society 2001

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References

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