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Method for accurately testing content of salt in seawater desalination liquid based on ion concentration and equipment special for method

A test method and ion concentration technology, applied in measuring devices, material analysis through electromagnetic means, instruments, etc., can solve problems such as activity coefficient, correction, low concentration, and small-scale concentration determination

Inactive Publication Date: 2012-06-27
NANJING UNIV
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Problems solved by technology

At present, the standard curve method is the most widely used method, but its disadvantage is that it is an empirical method without considering the correction of the activity coefficient, and is only suitable for low concentration and small range concentration determination.

Method used

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  • Method for accurately testing content of salt in seawater desalination liquid based on ion concentration and equipment special for method
  • Method for accurately testing content of salt in seawater desalination liquid based on ion concentration and equipment special for method
  • Method for accurately testing content of salt in seawater desalination liquid based on ion concentration and equipment special for method

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Embodiment 1

[0038] Prepare a series of NaCl solutions and seawater desalination solutions with an ionic strength between 0.0007 and 0.7mol / kg, and the composition of the seawater desalination solution with an ionic strength of 0.7mol / kg adopts Kester’s artificial seawater preparation method [see: Limnology & Oceanography , 1967, (12): 176-179], seawater desalination liquids of other ionic strengths were obtained by diluting 0.7mol / kg seawater desalination liquids. use as Figure 5 wherein the temperature is controlled by constant temperature water bath device W1, I1 is the instrument of the present invention, T1 is a thermocouple, E1 is a chloride ion selective electrode, E2 is a sodium ion glass electrode, and E1 and E2 are connected with the instrument I1 of the present invention to form the principle Battery. In order to improve the stability of sodium ion glass electrode E2 and chloride ion selective electrode E1, pretreatment must be carried out before the experiment. -4 mol / LNaCl ...

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Abstract

The invention relates to a method for accurately testing the content of salt in seawater desalination liquid based on ion concentration and equipment special for the method. By the method, an activity coefficient is corrected, measuring accuracy is improved, and the application range is expanded. Values of standard potential E<0> and slope S can be obtained through correction, a functional relation between the concentration of sodium ions in the seawater desalination liquid and the electromotive force of NaCl in the seawater desalination liquid is deduced according to a Nernst equation. During use, two indicating electrodes, namely a chloride ion selective electrode and a sodium ion glass electrode are used as a positive electrode and a negative electrode and are connected with an instrument to form a primary battery, the electromotive force of the seawater desalination liquid with unknown concentration is measured and substituted into the functional relation, and the display instrument can directly display the accurate concentration of the sodium ions in the seawater desalination liquid. The method is suitable for measuring low concentration in a narrow range, and is also suitable for accurately measuring the content of the salt in the seawater desalination liquid with high salt concentration, the accuracy of the method is higher than that of the conventional method, and a standard buffer solution is not required to be added in a linear range.

Description

technical field [0001] The invention relates to an accurate test method and special equipment for the salt content of seawater desalination liquid based on ion concentration. technical background [0002] Water resources are becoming a precious and scarce resource. The issue of water resources is not only a resource issue, but also a major strategic issue related to national economic and social sustainable development and long-term stability. Water has become another crisis after the energy crisis in many countries. In this situation, seawater desalination has been paid more and more attention. Seawater desalination is the use of seawater desalination to produce fresh water. As an open source and incremental technology for water resources, seawater desalination has become an important way to solve the global water resource crisis. How to accurately measure the salt concentration before and after seawater is an important technical link in the seawater desalination process. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/413
Inventor 张志炳钱红亮武法文周政戴月
Owner NANJING UNIV
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