Method for automatically determining salinity in seawater

Abstract

The invention discloses a method for automatically determining the salinity in seawater. A determination apparatus used by the method comprises a sample introduction valve, an optical flow cell, and an optical detector. The method comprises the following steps: 1, arranging the determination apparatus in a sample introduction state, allowing a driving liquid C to enter the optical flow cell, transmitting a signal to a computer processing system through the optical detector, processing by the computer processing system to obtain a baseline, and allowing a sample S1 to go through a sample flow path and the sample introduction valve, enter and fill a sample introduction ring when the baseline is plotted; 2, converting the determination apparatus to an analysis state, allowing the sample S1 in the sample introduction ring to go through the sample introduction valve and a pipe fitting and enter the optical flow cell under the driving of the driving liquid C, transmitting a signal to the computer processing system through the optical detector, and processing by the computer processing system to obtain a sample spectrum, wherein the pipe fitting connects the sample introduction valve with the optical flow cell; 3, substituting the sample by a series of standard samples S2 having known salinities, and repeating step 1 and step 2 to obtain a series of standard sample spectra; and 4, comparing the plotted sample spectrum with the standard sample spectra, and calculating through the regression equation of a standard sample work curve to obtain the salinity in the sample.

Description

technical field [0001] The invention belongs to the field of seawater salinity measurement and relates to an automatic measurement method for salinity in seawater. Background technique [0002] Salinity is a measure of the amount of salt in seawater. The salinity of seawater is an important characteristic of seawater. It, together with temperature and pressure, are the basic parameters for studying the physical and chemical processes of seawater. Many phenomena and processes that occur in the ocean and the reproduction and growth of marine organisms are related to the distribution and change of seawater salinity. Therefore, the study of the distribution and change law of salinity in the ocean occupies an important position in marine science. [0003] Regarding the determination of seawater salinity, existing methods include chemical analysis and physical measurement. The chemical analysis methods suitable for seawater mainly include the Mohr-Kundsen method and Fayon justic...

AI Technical Summary

Problems solved by technology

The inductive salinity meter is based on the principle of electromagnetic induction and can be measured in the field and in the laboratory. However, due to the large amount of samples required by the inductive salinity meter, the sensitivity is not as high as that of the electrode salinity meter, and temperature compensation is required. Operation It is more cumbersome, which leads to the development of the salinity meter to the electrode type salinity meter (the first instrument used to measure salinity by the conductivity method is the electrode type salinity meter), but the measuring electrode of the electrode type salinity meter is directly in contact with seawater, which is prone to extremes. Corrosion and pollution by seawater will reduce the performance, affect the test accuracy and reduce the service life

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