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Continuous flow analysis of iron (III) in seawater using a chalcogenide glass ion-selective electrode
Journal article   Peer reviewed

Continuous flow analysis of iron (III) in seawater using a chalcogenide glass ion-selective electrode

Roland De Marco, B Pejcic and X D Wang
Laboratory Robotics and Automation, Vol.11(5), pp.284-288
1999
url
https://doi.org/10.1002/(SICI)1098-2728(1999)11:5<284::AID-LRA7>3.0.CO;2-8View
Published Version

Abstract

extrapolation flow of fluids ion selective electrodes iron analysis marine biology seawater toxicity
Continuous flow analysis (CFA) is suitable for rapid and reliable determination of free FeIII in organic-free, UV-oxidized seawater when used in conjunction with an extrapolation method that predicts the steady-state potentials of an FeIII chalcogenide glass ion-selective electrode (ISE) by using initial data associated with a step-wise change in aFe3+. It is shown that the CFA technique yields a Nernstian response of a 30 mV per decade change in aFe3+ in saline citrate buffers in the range of 10-22 to 10-16 M Fe3+. Validation of the CFA technique in organic-free, UV-oxidized seawater has demonstrated that the response of the FeIII ISE is internally consistent with the well-known inorganic speciation equilibria occurring in natural seawater.

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Automation & Control Systems
Chemistry, Analytical
Robotics
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