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Applications of microelectrodes and scanning electrochemical microscopy (SECM) to complex environmental interfaces

Applications of microelectrodes and scanning electrochemical microscopy (SECM) to complex environmental interfaces
Applications of microelectrodes and scanning electrochemical microscopy (SECM) to complex environmental interfaces
During this research, microelectrodes were employed as sensors and scanning electrochemical microscopy (SECM) probes to further understand two complex environmental interfaces: the sea surface microlayer (SML), and the iron-groundwater interface at permeable reactive barriers (PRBs).

The water-air and water-SML interfaces were investigated through the oxidation current of a model redox pair at a Pt submarine microdisc. Chronoamperometry and cyclic voltammetry allowed us to determine the concentration and diffusion coefficients of the redox species at different tip-substrate distances with respect to each interface. The approach curves recorded revealed information regarding the stability of the water-air interface over time and its susceptibility to the acquisition mode, size of the meniscus and the ratio of glass/microwire of the tip (RG).

The iron-groundwater interface was investigated in terms of the corrosion activity and ReO4- uptake from groundwater of iron from different sources and particle sizes. The relationship between the corrosion of iron and the uptake of ReO4- was investigated using supplementary techniques like laser ablation inductively coupled plasma mass spectrometry (ICP-MS), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDX). The results obtained represented a basis to understand the TcO4- uptake from groundwater at PRBs.
University of Southampton
Perdomo Marin, Ana Cristina
71119686-0fc3-4266-a10d-455caef10ac5
Perdomo Marin, Ana Cristina
71119686-0fc3-4266-a10d-455caef10ac5
Denuault, Guy
5c76e69f-e04e-4be5-83c5-e729887ffd4e

Perdomo Marin, Ana Cristina (2018) Applications of microelectrodes and scanning electrochemical microscopy (SECM) to complex environmental interfaces. University of Southampton, Doctoral Thesis, 200pp.

Record type: Thesis (Doctoral)

Abstract

During this research, microelectrodes were employed as sensors and scanning electrochemical microscopy (SECM) probes to further understand two complex environmental interfaces: the sea surface microlayer (SML), and the iron-groundwater interface at permeable reactive barriers (PRBs).

The water-air and water-SML interfaces were investigated through the oxidation current of a model redox pair at a Pt submarine microdisc. Chronoamperometry and cyclic voltammetry allowed us to determine the concentration and diffusion coefficients of the redox species at different tip-substrate distances with respect to each interface. The approach curves recorded revealed information regarding the stability of the water-air interface over time and its susceptibility to the acquisition mode, size of the meniscus and the ratio of glass/microwire of the tip (RG).

The iron-groundwater interface was investigated in terms of the corrosion activity and ReO4- uptake from groundwater of iron from different sources and particle sizes. The relationship between the corrosion of iron and the uptake of ReO4- was investigated using supplementary techniques like laser ablation inductively coupled plasma mass spectrometry (ICP-MS), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDX). The results obtained represented a basis to understand the TcO4- uptake from groundwater at PRBs.

Text
ACPM PhD Thesis - Version of Record
Restricted to Repository staff only until 31 January 2022.
Available under License Creative Commons Attribution.

More information

Published date: September 2018

Identifiers

Local EPrints ID: 428047
URI: http://eprints.soton.ac.uk/id/eprint/428047
PURE UUID: 9f2a699a-b461-4274-b138-9a0e9fd4c95a
ORCID for Guy Denuault: ORCID iD orcid.org/0000-0002-8630-9492

Catalogue record

Date deposited: 07 Feb 2019 17:30
Last modified: 30 Jan 2020 01:26

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