Method for using flowing gaseous derivatization reagent on online derivatization

Abstract

The invention discloses a method for using a flowing gaseous derivatization reagent on an online derivatization. The method comprises the following steps: forming a liquid derivatization reagent intoa gaseous state by heating and gas flow purging; transporting into a sample cell; immediately derivatizing with a gaseous polar target in the sample cell; and absorbing the derivatized product after the derivatization by an absorption liquid. The method is suitable for the derivatization of gaseous polar compounds, the derivatives satisfy the gas chromatographic analysis and belongs to the field of sample preparation. The method has the advantages of simple, online, automatic, solvent-free, rapid derivatization reaction, improving the analytical performance of polar compounds, and direct application to the gas chromatographic analysis.

Description

technical field [0001] The invention belongs to the field of sample pretreatment, and in particular relates to a method for online derivatization of flowing gaseous derivatization reagents. Background technique [0002] The derivatization of polar compounds is a common sample processing process for gas chromatographic analysis of polar compounds, and the analytical performance of polar compounds can be improved through derivatization. It usually includes: adding a derivatization reagent (liquid) to a solution containing a polar compound (sample extract) for derivatization (CN104569197A); Derivatization and extraction process in space (CN101144800); or gaseous polar compounds are absorbed and reacted by the absorption liquid containing derivatization reagents (CN105784886A); or a trace amount of derivatization reagents are injected into the sample cell and vaporized React with gaseous polar compounds in the sample cell (CN103245544A). The reaction between the liquid derivat...

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Problems solved by technology

The reaction between the liquid derivatization reagent and the polar compound in the solution is usually affected by the solvent effect (CN104569197A, CN101144800, CN105784886A); the way the derivatization reagent is placed on the needle tip is unstable and easy to fall off and volatilize (CN101144800); The method of directly absorbing gaseous polar compounds by derivatization reagents is not suitable for polar compounds that are easy to decompose at high temperature and cannot form gaseous polar compounds (CN105784886A), and the derivatization reaction is also affected by the solvent effect; the advan

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