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Portable analyser using two-dimensional ion chromatography with ultra-violet light-emitting diode-based absorbance detection for nitrate monitoring within both saline and freshwaters

Citation

Fitzhenry, C and Jowett, L and Roche, P and Harrington, K and Moore, B and Paull, B and Murray, E, Portable analyser using two-dimensional ion chromatography with ultra-violet light-emitting diode-based absorbance detection for nitrate monitoring within both saline and freshwaters, Journal of Chromatography A, 1652 Article 462368. ISSN 0021-9673 (2021) [Refereed Article]


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DOI: doi:10.1016/j.chroma.2021.462368

Abstract

A portable and automated IC system with a dual-capability for the analysis of both fresh and saline environmental waters has been developed. Detection of nitrate in complex matrices such as seawater was achieved by the employment of an automated two-dimensional (heart-cut) IC method utilised in tandem with on-column matrix elimination, using a sodium chloride eluent. The system also demonstrated the capability to switch to a second mode of analysis, whereby direct one-dimensional IC analysis was employed to rapidly detect nitrite and nitrate in freshwater, with direct UV LED based absorption detection in under 3 minutes. Calibration curves using a 195 L sample loop were generated for both freshwater and artificial seawater samples. For marine analysis, an analytical range of 0.1 mg L1 -40 mg L1 NO3- was possible, while an analytical range (0.1 mg L-1 - 15 mg L-1 NO2-, 0.2 - 30 mg L-1 NO3-) appropriate for freshwater analysis was also achieved. Chromatographic repeatability for both marine and freshwater analysis was verified over 40 sequential runs with RSD values of < 1% demonstrated for both peak area and retention times for each mode of analysis. The selectivity of both methods was demonstrated with interference tests with common anions present in environmental waters. Recovery analysis was carried out on marine samples from Tramore Bay, Co. Waterford, Ireland, and the systems analytical performance was compared with that of an accredited IC following environmental sample analysis.

Item Details

Item Type:Refereed Article
Research Division:Chemical Sciences
Research Group:Analytical chemistry
Research Field:Separation science
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the chemical sciences
UTAS Author:Paull, B (Professor Brett Paull)
UTAS Author:Murray, E (Mr Eoin Murray)
ID Code:151563
Year Published:2021
Web of Science® Times Cited:1
Deposited By:Plant Science
Deposited On:2022-08-01
Last Modified:2022-08-29
Downloads:0

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