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Abstract

A cost-effective, automated and portable IC has been developed for in-situ analysis of nitrite and nitrate in natural waters. The system employed 3D printed pumps for eluent delivery and a deep-UV LED based optical detector. Isocratic separation and selective detection of nitrite and nitrate was achieved in under 3 min. The total weight of the analyser was ~11 kg, and included electronics along with a sample intake system for automated analysis. Linear calibration ranges were generated using different sample injection loops. Using a 150 μL loop, an analytical range (0.0530 mg L−1 NO2−, 0.1075 mg L−1 NO3−) suitable for freshwater analysis was generated, while using a 10 μL loop an analytical range (0.30100 mg L−1 NO2−, 2.5500 mg L−1 NO3−) suitable for effluent and domestic wastewater analysis was achieved. Chromatographic repeatability demonstrated by the system is graphically presented and RSD values of in-situ at multiple sites for varying deployment periods analysing septic tank water, effluent from a waste water treatment plant and stream water. The data generated by the in-situ system were comparable to grab sample data generated by accredited laboratory instrumentation.

Item Type:	Article
Authors/Creators:	Murray, E and Roche, P and Briet, M and Moore, B and Morrin, A and Diamond, D and Paull, B
Keywords:	Ion chromatography, portable, nutrients, water analysis, UV light-emitting diode, nitrate
Journal or Publication Title:	Talanta
Publisher:	Elsevier Science Bv
ISSN:	0039-9140
DOI / ID Number:	https://doi.org/10.1016/j.talanta.2020.120955
Copyright Information:	© 2020 Elsevier B.V. All rights reserved.
Related URLs:	Google Scholar: Paull, B UTAS Profile: Paull, B
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