Detection device and detection method of nitrite or nitrate content

Abstract

The invention discloses a detection device and a detection method of nitrite or nitrate content. The detection device comprises a peristaltic pump, a flowing cuvette, a light source, an optical receiver, a cadmium ring and seven three-way electromagnetic valves, wherein sampling, circulation, developing, reduction and waste discharging are realized via controlling of the peristaltic pump and selection of the three-way electromagnetic valves, so as to shorten the flow path of the detection device, and ensure high integration level, small size and on-line analysis suitability. Via circulation design, the reaction efficiency is greatly improved; reaction products in the whole loop are uniform in concentration; an average value can be obtained via repeated measurement; the parallelity and the stability are greatly improved. Moreover, the cadmium ring is taken as a reduction component, and a sample solution to be detected flows in the cadmium ring at a certain speed, so that not only is the reduction efficiency improved, but also repeated filling is avoided, and the operation is convenient and fast; use of poisonous and harmful reagents is avoided.

Description

technical field [0001] The invention belongs to the technical field of seawater chemical analysis, and in particular relates to a device and a method for detecting the content of nitrite and nitrate in seawater. Background technique [0002] Nitrite and nitrate widely exist in marine water bodies and are one of the important parameters for marine ecological environment monitoring. At present, the determination of nitrite and nitrate in seawater is mainly based on the marine monitoring specification (GB17378-2007), using the field sampling-laboratory measurement method based on the survey ship. This method has disadvantages such as poor real-time performance, easy contamination of the sample solution to be tested, and waste of manpower and material resources. In recent years, online measurement devices and methods have become one of the research hotspots in the marine field. [0003] At present, the main method for the determination of nitrite and nitrate in seawater is spe...

AI Technical Summary

Problems solved by technology

However, the detection point at this time is not necessarily the point with the highest degree of reaction completion, and there are problems such as poor parallelism, poor stability, and incomplete reaction.

Moreover, in the reaction flow path, it is easy to generate air bubbles, which will affect the accuracy of the detection results to a large extent

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