Fast voltammetry of metals at carbon-fiber microelectrodes: towards an online speciation sensor. Issue 23 (3rd November 2016)

• Record Type: Journal Article
• Authors: Pathirathna, Pavithra; Siriwardhane, Thushani; McElmurry, Shawn P.; Morgan, Stephen L.; Hashemi, Parastoo
• Is Part Of: Analyst. Volume 141:Issue 23(2016)
• Page Start: 6432
• Page End: 6437
• Publication Date: 2016-11-03
• Subjects: Chemistry, Analytic -- Periodicals; 543
• DOI: 10.1039/c6an01807f
• Languages: English
• ISSNs: 0003-2654

Abstract

Abstract : Speciation controls the chemical behavior of trace metals. Abstract : 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 Cu 2+ can be detected using FSCAV in different matrices. We find that matrices with different Cu 2+ binding ability do not affect the equilibrium of Cu 2+ adsorption onto CFMs, and thus are an excellent predictor for free Cu 2+ ([Cu 2+ ]free ) in solution. We modelled a correlation between the FSCV response, [Cu 2+ ]free and log K f for 15 different Cu 2+ complexes. Using our model, we rapidly predicted, and verified [Cu 2+ ]free and K f of a real groundwater sample spiked with Cu 2+ . We thus highlight the potential of fast voltammetry as a rapid trace metal speciation sensor.