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Issue 15, 2018
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Development and application of a portable fluorescence detector for shipboard analysis of ammonium in estuarine and coastal waters

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Abstract

Herein, a novel homemade portable fluorescence detector that is simple, smaller, and transportable for the shipboard analysis of ammonium in estuarine and coastal waters has been developed and applied in a flow system for ammonium analysis based on the reaction of ammonium, OPA, and sulfite. The detector incorporates a UV-LED, two band pass filters, a photomultiplier tube (PMT), a modified flow cell, and an electronic circuit with a constant voltage supply and a constant current supply. The modified flow cell of the detector used in this study can avoid the interference of air bubbles in the fluorescence signal. A 100 nmol L−1 ammonium standard solution was continuously measured for 90 min. An RSD of 0.8% (n = 38) was obtained, indicating the good stability of the detector. Compared with the commercial PMT-FL fluorescence detector, the homemade detector was smaller and lightweight and demonstrated better sensitivity (approximately 11.4% higher). Moreover, the parameters of the flow system were optimized. Under optimal conditions, a detection limit of 2.1 nmol L−1 within the working range of 0–300 nmol L−1 was obtained. Using the underway sampling system, the homemade portable fluorescence detector was applied in Jiulongjiang estuary, and the distribution of ammonium in the surface seawater was obtained.

Graphical abstract: Development and application of a portable fluorescence detector for shipboard analysis of ammonium in estuarine and coastal waters

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Publication details

The article was received on 27 Feb 2018, accepted on 17 Mar 2018 and first published on 19 Mar 2018


Article type: Technical Note
DOI: 10.1039/C8AY00438B
Citation: Anal. Methods, 2018,10, 1781-1787
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    Development and application of a portable fluorescence detector for shipboard analysis of ammonium in estuarine and coastal waters

    Y. Zhu, J. Chen, X. Shi, D. Yuan, S. Feng, T. Zhou and Y. Huang, Anal. Methods, 2018, 10, 1781
    DOI: 10.1039/C8AY00438B

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