Continuous flow analysis of mercury using a chalcogenide glass ion-selective electrode

Roland De Marco; B Pejcic; S Cook

doi:10.1002/1098-2728(2000)12:4<194::AID-LRA4>3.0.CO;2-O

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Continuous flow analysis of mercury using a chalcogenide glass ion-selective electrode

Journal article

Peer reviewed

Continuous flow analysis of mercury using a chalcogenide glass ion-selective electrode

Roland De Marco, B Pejcic and S Cook

Laboratory Robotics and Automation, Vol.12(4), pp.194-199

2000

DOI: https://doi.org/10.1002/1098-2728(2000)12:4<194::AID-LRA4>3.0.CO;2-O

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https://doi.org/10.1002/1098-2728(2000)12:4<194::AID-LRA4>3.0.CO;2-OView

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Abstract

composition effects

error analysis

extrapolation

mercury

scanning electron microscopy

seawater effects

x ray diffraction analysis

x ray photoelectron spectroscopy

A commercial Hg chalcogenide glass ion-selective electrode (ISE) has been characterized using scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy, and the compositional data have been used in the fabrication of our own Hg ISE. It is shown that continuous flow analysis (CFA) is suitable for rapid determinations of ultratrace levels of mercury in saline media when used in conjunction with an extrapolation method that predicts the steady-state potential of the Hg ISE by using the initial data following a stepwise change in aHg2+. The CFA technique yields a near-Nernstian response of 28 mV per decade change in aHg2+ in Hg buffers in the range 10-18 to 10-12M Hg2+. It is shown that the repeatability of the CFA technique in seawater is ±0.03 pHg units, and a seawater matrix effect causes a significant offset and apparent error in the response of the Hg ISE relative to Hg buffer standards. Standard addition CFA may be used to compensate for the seawater matrix interference.

Details

Title: Continuous flow analysis of mercury using a chalcogenide glass ion-selective electrode
Authors: Roland De Marco (Author) - Curtin University of Technology
B Pejcic (Author) - Curtin University of Technology
S Cook (Author) - Curtin University of Technology
Publication details: Laboratory Robotics and Automation, Vol.12(4), pp.194-199
Publisher: John Wiley & Sons Inc.
Date published: 2000
DOI: 10.1002/1098-2728(2000)12:4<194::AID-LRA4>3.0.CO;2-O
ISSN: 0895-7533
Organisation Unit: University of the Sunshine Coast, Queensland; Office of the Deputy Vice-Chancellor (Research and Innovation)
Language: English
Record Identifier: 99448831802621
Output Type: Journal article

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Web Of Science research areas: Automation & Control Systems; Chemistry, Analytical; Robotics