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• W3176802140 abstract "• Two-dimensional rapid IC with on-column matrix elimination for seawater analysis. • Selective, rapid and direct detection of nitrite and nitrate in freshwater. • Deep UV LED based optical detection for nitrate determination. • Automated dual-functionality for alternative analysis of freshwater or marine waters. • Analytical performance comparable to accredited instrumentation. 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 µL sample loop were generated for both freshwater and artificial seawater samples. For marine analysis, an analytical range of 0.1 mg L −1 – 40 mg L −1 NO 3 − was possible, while an analytical range (0.1 mg L −1 – 15 mg L −1 NO 2 − , 0.2 – 30 mg L −1 NO 3 − ) 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." @default.
• W3176802140 created "2021-07-05" @default.
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• W3176802140 date "2021-08-01" @default.
• W3176802140 modified "2023-09-29" @default.
• W3176802140 title "Portable analyser using two-dimensional ion chromatography with ultra-violet light-emitting diode-based absorbance detection for nitrate monitoring within both saline and freshwaters" @default.
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• W3176802140 doi "https://doi.org/10.1016/j.chroma.2021.462368" @default.
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