High-precision online fluorescence detector and detection method thereof

Abstract

The invention discloses a high-precision online fluorescence detector and a detection method thereof. The detector comprises a photoelectric sensor module, a single processing module, an equal precision frequency measuring module, a USB-serial interface conversion module, a power supply module and an upper computer. The photoelectric sensor module is connected to the single processing module; the output terminal of the single processing module is connected to the equal precision frequency measuring module; the equal precision frequency measuring module is connected to the USB-serial interface conversion module through a lower computer; the USB-serial interface conversion module is connected to the upper computer; and the power supply module is connected to the photoelectric sensor module, the single processing module, the equal precision frequency measuring module, and the USB-serial interface conversion module. The detector can be on-line co-used with a flow injection analyzer to detect the concentration of trace ammonia-N on line, has the advantages of good selectivity, high sensitivity, rapid responding speed, high accuracy, good stability, low cost, and small volume, and thus has a good application prospect.

Description

technical field [0001] The invention relates to a detector, in particular to a high-precision online fluorescence detector and a detection method. Background technique [0002] Ammonium nitrogen is the most important form of inorganic nitrogen in water bodies, which can be directly used by phytoplankton in water bodies. Other forms of nitrogen must first be converted into ammonium nitrogen before they can be used by phytoplankton. If the content of ammonium nitrogen in the water is too high, it will poison aquatic organisms and even destroy the ecological balance of the water body; if the content is too low, it may inhibit the growth of phytoplankton, affect the primary productivity of the water area, and then affect the balance of the aquatic ecosystem. Accurate determination of the content of ammonium nitrogen in water is necessary to understand the water quality and predict the productivity of the water. In fact, ammonium nitrogen is one of the basic items required to be...

AI Technical Summary

Problems solved by technology

The current online fluorescence detection technologies for ammonium nitrogen are all based on o-phthalaldehyde (o-phthaldialdehyde, referred to as OPA) method, using large-scale general-purpose instruments for analysis in the laboratory, and there is still a lack of low-cost, miniaturized devices that can be applied to environmental monitoring sites. Ammonium nitrogen online fluorescence detector

However, the development of detectors based on the OPA method needs to select an excitation light source with a wavelength in the ultraviolet region, which is very difficult to develop, and there is still a lack of methods based on 4,5-dimethoxyphthalaldehyde (4-methoxyphthalaldehyde, referred to as M 2 OPA) method, ammonium nitrogen online detector with excitation light source wavelength in visible light region

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