Preparation method and vapor pressure determination method of deeply degassed solution with volatile components

Abstract

The invention discloses a preparation method of a component volatile deep degassed solution. The prepared solution of certain concentration includes n solutes, and the steps comprise: subjecting a solvent container to vacuum pumping, sealing and weighing, and denoting the mass of the solvent container as m1; adding a solvent into the solvent container, conducting sealing and refrigeration, when the solvent is all frozen, subjecting the solvent container to vacuum pumping, sealing and weighing, and denoting the mass of the solvent container as m1'; calculating the mass of each solute; subjecting the solvent container to vacuum pumping, sealing and weighing, and denoting the mass of the solvent container as m2; adding an i-th solute with a mass of m solute i into the solvent container, then conducting vacuum pumping, sealing and weighing to obtain total mass m2i; adding the 1st solute till the n-th solute into liquid one by one until all the solutes are fully dissolved; and calculating the exact concentration of each solute in the prepared solution of certain concentration. The invention also discloses a vapor pressure determination method of the component volatile deep degassed solution. The method provided by the invention avoids the problem of difficult accurate determination of the solution concentration after a conventional degassing process, and greatly improves the measurement accuracy.

Description

technical field [0001] The invention relates to a measurement technology of solution vapor pressure, in particular to a method for preparing a deep degassed solution with volatile components and a method for measuring the vapor pressure. Background technique [0002] Saturated vapor pressure, referred to as vapor pressure, is the vapor pressure value at a certain temperature when the solid phase or the liquid phase are in equilibrium. For a solution, that is, at a certain temperature, when the liquid molecules in the liquid evaporate into gaseous molecules and the gaseous molecules hit the liquid surface and return to the liquid state, the pressure that can be generated by the gaseous molecules hitting the liquid is balanced. [0003] Vapor pressure is related to both temperature and solution concentration. For example, the vapor pressure of lithium chloride solution increases with increasing temperature and decreases with increasing solution concentration. The invention a...

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Problems solved by technology

However, the detection of atomic analysis spectrometer also has many limitations: 1. Not all elements can be detected, for example, when detecting the concentration of sodium ions, carbonate ions and bicarbonate ions in the mixed aqueous solution of sodium carbonate and sodium bicarbonate, Since the atomic analysis spectrometer cannot measure carbon elements, it is difficult to determine the components of anions; 2. The determination of each element requires a corresponding hollow cathode lamp to provide corresponding characteristic radiation, which is very inconvenient for the experimental operation; 3. It is impossible to determine the content of organic solutions. Components; 4. The price is very expensive. The price of atomic absorption spectrometers on the market ranges from tens of thousands to hundreds of thousands, resulting in huge experimental costs

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