Fast voltammetry of metals at carbon-fiber microelectrodes: towards an online speciation sensor.
Speciation controls the chemical behavior of trace metals. Thus, there is great demand for rapid speciation analysis in a variety of fields. In this study, we describe the application of fast scan cyclic voltammetry (FSCV) and fast scan adsorption controlled voltammetry (FSCAV) to trace metal speciation analysis. We show that Cu2+can be detected using FSCAV in different matrices. We find that matrices with different Cu2+binding ability do not affect the equilibrium of Cu2+adsorption onto CFMs, and thus are an excellent predictor for free Cu2+([Cu2+]free) in solution. We modelled a correlation between the FSCV response, [Cu2+]freeand log Kffor 15 different Cu2+complexes. Using our model, we rapidly predicted, and verified [Cu2+]freeand Kfof a real groundwater sample spiked with Cu2+. We thus highlight the potential of fast voltammetry as a rapid trace metal speciation sensor.
Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29205, USA. hashemi@mailbox.sc.edu.
Pavithra
P
Pathirathna
Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29205, USA. hashemi@mailbox.sc.edu.
Thushani
T
Siriwardhane
Department of Civil and Environmental Engineering, Wayne State University, Detroit, MI 48202, USA.
Shawn P
http://orcid.org/0000-0001-7398-431X
SP
McElmurry
Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29205, USA. hashemi@mailbox.sc.edu.
Stephen L
SL
Morgan
Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29205, USA. hashemi@mailbox.sc.edu.
Parastoo
P
Hashemi