Title

Electrochemically Modified Sol-gel Films for Selective Heavy Metal Binding and Quantification with Total Reflection X-Ray Fluorescence

Presenter Information

Jay HiltonFollow
Brooke E. Tate

Faculty Mentor(s)

Royce N. Dansby-Sparks

Campus

Dahlonega

Proposal Type

Oral Presentation

Subject Area

Chemistry

Location

MPR 2

Start Date

22-3-2019 10:00 AM

End Date

22-3-2019 11:00 AM

Description/Abstract

The aim of this work is to lower limits of detection and improve selectivity of Total Reflection X-Ray Fluorescence (TXRF) for specific heavy metal ions by producing chemically selective sol-gel films. Two approaches are explored, one using chemically selective binding of Cr(VI) to pyridine functionalized sol-gel films and a second using molecularly imprinted sol-gel films for As(V) detection. Both methods are produced using electrochemically deposited sol-gel thin films on conductive ITO electrodes. These electrodes are then exposed to aqueous solutions of Cr and As which are then interfaced with a commercially available TXRF for quantification. Gold nanoparticles are incorporated to be used as an internal standard for TXRF calibrations. Sensors are regenerated for multiple uses by chemical and electrochemical means. Electrodes using a similar interface are analyzed by square wave voltammetry for analysis of Cr(VI) sol-gel interaction across a regular surface.

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Mar 22nd, 10:00 AM Mar 22nd, 11:00 AM

Electrochemically Modified Sol-gel Films for Selective Heavy Metal Binding and Quantification with Total Reflection X-Ray Fluorescence

MPR 2

The aim of this work is to lower limits of detection and improve selectivity of Total Reflection X-Ray Fluorescence (TXRF) for specific heavy metal ions by producing chemically selective sol-gel films. Two approaches are explored, one using chemically selective binding of Cr(VI) to pyridine functionalized sol-gel films and a second using molecularly imprinted sol-gel films for As(V) detection. Both methods are produced using electrochemically deposited sol-gel thin films on conductive ITO electrodes. These electrodes are then exposed to aqueous solutions of Cr and As which are then interfaced with a commercially available TXRF for quantification. Gold nanoparticles are incorporated to be used as an internal standard for TXRF calibrations. Sensors are regenerated for multiple uses by chemical and electrochemical means. Electrodes using a similar interface are analyzed by square wave voltammetry for analysis of Cr(VI) sol-gel interaction across a regular surface.