Analysis method and system for total nitrogen and total phosphorus in seawater based on characteristic peak area of ​​absorption spectrum

Abstract

The invention relates to a seawater total nitrogen and total phosphorus analysis method and system based on the characteristic peak area of ​​absorption spectrum, which solves the problem of low detection accuracy and instrument detection in traditional single-wavelength and multi-wavelength methods when measuring seawater with low concentration of total nitrogen and total phosphorus The lower limit problem mainly includes seven parts: data acquisition, absorbance conversion, smoothing filter, characteristic position selection, characteristic peak area calculation, regression model and concentration data output. Using the characteristic peak area, the weak absorbance near the detection limit of the instrument can be reduced The signal can be amplified by the amount of information, which can improve the detection ability of the instrument when it is close to the detection limit of the instrument.

Description

technical field [0001] The invention relates to a quantitative analysis method and system for total nitrogen and total phosphorus in seawater based on the characteristic peak area of ​​absorption spectrum. Background technique [0002] Seawater total nitrogen and total phosphorus is one of the important indicators reflecting the degree of seawater pollution and eutrophication. The online monitoring of total nitrogen and total phosphorus in seawater can provide long-term continuous real-time monitoring data for ecological monitoring and early warning of ecological disasters such as red tides and green tides, and improve the timeliness and accuracy of forecasts. [0003] The online monitoring technology of sea water quality based on absorption spectroscopy is a method based on the principle that specific substances in water absorb light of a specific wavelength, and indirectly measure water quality parameters by measuring the molecular absorption spectrum of substances. Since...

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Problems solved by technology

[0005] In order to solve the problems of low detection accuracy and lower detection limit of the instrument when the traditional single-wavelength and multi-wavelength methods measure seawater with low concentrations of total nitrogen and total phosphorus, the present invention aims at high-precision, high-real-time monitoring of total nitrogen in seawater. In order to meet the requirements of accuracy, a quantitative analysis method of total nitrogen and total phosphorus in seawater based on the characteristic peak area of ​​the absorption spectrum is proposed. Modeling is carried out by calculating the characteristic peak area of ​​the absorption spectrum, which can effectively increase the detection accuracy of the instrument while ensuring real-time performance. lower detection limit

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