Method for measuring partition coefficient in laboratory sediment and surface water system

Abstract

The invention relates to a method for measuring a partition coefficient in a laboratory sediment and surface water system, and belongs to the technical field of nuclear environment simulation, the method comprises the following steps: S1, pretreating and analyzing a sediment-surface water system reaction medium to obtain a sediment particle size distribution spectrum, sediment components and surface water sample components; s2, preparing sediment-surface water system turbid liquid with set solid concentration; s3, preparing a radioactive tracing solution with a set nuclide initial concentration; s4, adding the radioactive tracing solution into the sediment-surface water system, and oscillating to enable the sediment-surface water system to reach adsorption equilibrium; and S5, measuring the equilibrium concentration of the radionuclide, and obtaining the distribution coefficient in the sediment-surface water system according to the water phase equilibrium concentration and the solid phase equilibrium concentration. By means of the method, accurate parameter support can be provided for concentration field distribution, nuclide migration rules and migration mathematical model establishment and deposition amount calculation of the liquid effluent in the receiving water body.

Description

technical field [0001] The invention belongs to the technical field of nuclear environment simulation, and specifically relates to a method for measuring the partition coefficient in a laboratory sediment and surface water system. Background technique [0002] When the radionuclide migrates in the sediment to surface water system, on the one hand, the nuclide itself will undergo a series of physical and chemical reactions with the medium ions, including adsorption, redox reaction, precipitation and co-precipitation, complexation reaction, etc.; The changeable environmental factors around the nuclide will also block the migration and transport of the nuclide in the sediment-surface water system. Therefore, the residence of nuclide migration in the solid phase and liquid phase of the medium is instantaneous, and the adsorption, desorption and absorption reactions of nuclide ions in the two phases also have the characteristics of instantaneous equilibrium. The distribution rati...

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Problems solved by technology

However, due to the artificial destructive pretreatment of the sediment sample during the experiment, this pretreatment will inevitably change its original natural properties, especially the creation of many fresh surfaces and the introduction of new surface tension, and these After the new surface with many cracks comes into contact with water, it is easy to weather, which leads to the change of the adsorption performance of the research object. At present, there is no way to find a proper solution to this problem in the world.

At the same time, due to the differences in experimental procedures and experimental conditions, the distribution coefficients of sediment-surface water systems measured by static batch methods in various countries, regions and laboratories are different, making the measurement results of different scientific research institutions and scholars incomparable. , the reference of the experimental results is greatly limited

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