Method for pretreating aqueous solution containing organic amine compounds and determination method

Abstract

The invention provides a method for pretreating an aqueous solution containing organic amine compounds and a determination method. The method for pretreating the aqueous solution containing the organic amine compounds comprises the following steps of: adding sodium hydroxide into the aqueous solution, and regulating the pH value of the aqueous solution to be more than 11 so as to ensure that metal ions in the aqueous solution are subjected to chemical reaction to obtain a metal hydroxide precipitate; dry-filtering to obtain a filtrate and the metal hydroxide precipitate, washing the metal hydroxide precipitate and a precipitation reaction container, and collecting a washing liquid into the filtrate; reducing the temperature of the filtrate to ensure that inorganic salts in the filtrate are crystallized and precipitated from the filtrate; and dry-filtering the filtrate which is subjected to temperature reduction to remove inorganic salt crystals and obtain a clear liquid, namely a sample solution. The determination method comprises the following step of: performing assay determination on the sample solution by one or more methods of gas chromatography-mass spectrometry, gas chromatography, liquid chromatography, and liquid chromatography-mass spectrometry to obtain the content of the organic amine compounds.

Description

technical field [0001] The invention relates to the detection and analysis of a solution containing organic amine compounds, in particular to a method capable of eliminating the influence of inorganic salts such as metal ions, hydrogen ions and sodium sulfate in the solution on the determination of organic amine compounds, thereby accurately A method for determining the content of organic amine compounds in a solution. Background technique [0002] In the prior art, organic amine compounds refer to organic compounds produced by the chemical reaction between organic substances and ammonia, and are generally divided into fatty amines, alcohol amines, amides, alicyclic amines, aromatic amines, naphthalene amines, and other amines. and other seven categories. For example, organic amine compounds include: methylamine, ethylamine, n-propylamine, tert-butylaminoethanol (TBE), tert-butylaminoethoxyethanol (TBEE), 2-pyridineethanol (PE), 2-amino-2-methanol 1-propanol (AMP), monoeth...

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Problems solved by technology

However, although the patent application discloses the use of alkaline reagents to eliminate the interference caused by metal ions and hydrogen ions, it not only does not solve the problem of the influence of inorganic salts such as sulfate, but also introduces a high concentration of Alkali metal ions such as sodium and potassium will instead lead to a substantial increase in the concentration of inorganic salts such as sodium sulfate in the prepared sample solution, which will lead to a large increase in the concentration of organic amines in the chromatographic analysis instruments such as GC or GC-MS. At high temperature, the organic components and water to be measured in the solution are vaporized and introduced into the chromatographic separation capillary column. At the same time, a large amount of inorganic salts that cannot be vaporized are evaporated to dryness and form solid particles that adhere to the sampling glass liner and the port of the capillary column. After measuring several samples, the glass liner or capillary column of the sample will be blocked. It is necessary to frequently clean the glass liner or cut and replace the blocked capillary column, which will affect the accuracy of detection and analysis and greatly reduce the service life of the expensive capillary column.

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