Quantitative analysis device for ammonia nitrogen in seawater

Abstract

The invention discloses a quantitative analysis device for ammonia nitrogen in seawater, which is used for preparing ammonia nitrogen dissolved in seawater and quantitatively detecting the concentration of a prepared ammonia gas. The quantitative analysis device comprises a preparation unit, a measurement unit and a data processing and control unit, wherein the data processing and control unit cancontrol an operation sequence of parts of the quantitative analysis device, and process acquired spectral signals so as to obtain the concentration of ammonia nitrogen. According to the quantitativeanalysis device, an ammonia gas is prepared from seawater by adding an alkaline reagent, the absorbance of the gas is obtained by adopting an ultraviolet-visible absorption spectrum method, and the concentration of the gas is analyzed by adopting a fast Fourier transform method. Compared with a traditional measuring method, the quantitative analysis device is easy to operate, short in measuring time, high in automation degree and not prone to being disturbed by pigments and particles in water, and the precision of system measurement is improved, the monitoring level of an environmental protection department on the ammonia nitrogen of the seawater body is improved, and a powerful technical support is provided for effectively preventing and treating ammonia nitrogen pollution of the water body.

Description

technical field [0001] The invention relates to the field of on-line monitoring of seawater environmental pollution, in particular to the field of environmental optical monitoring technology, in particular to a quantitative analysis device for ammonia nitrogen in seawater. Background technique [0002] Seawater resources are important resources for the survival and development of human beings. Seawater pollution will have an important impact on the stability of marine ecology, resulting in the destruction of the diversity of marine life, and will cause major losses to marine fisheries and marine aquaculture. Therefore, strengthening seawater Quality testing is particularly important. [0003] With the development of my country's economy and society, seawater pollution is becoming more and more serious. Marine aquaculture in coastal areas, domestic sewage and industrial wastewater discharge in coastal cities increase the content of ammonia nitrogen and hydrogen sulfide in se...

AI Technical Summary

Problems solved by technology

Among them, the sodium hypobromite oxidation method needs to use a lot of chemical reagents and the operation process is complicated. The sea water sample must be filtered through the oil film before the experiment can be carried out. The water sample should be tested immediately after collection, otherwise it needs to be refrigerated. In addition, ammonia gas in the air during the measurement process can also affect the accuracy of its results

The indophenol blue method is susceptible to the influence of metal ions in seawater, uses more chemical reagents and the reagents are toxic, the operation is complicated, the analysis time is long, and oil film filtration is also required to prevent the influence of air ammonia

In addition, methods for detecting ammonia nitrogen in water bodies include Nessler reagent photometry, salicylic acid-hypochlorous acid photometry, etc., but none of them are suitable for the measurement of ammonia nitrogen in seawater.

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