Measuring method of multifold organic constituent desorption efficiency in an active carbon pipe

Abstract

The invention discloses a measuring method of a multifold organic constituent desorption efficiency in an active carbon pipe. The measurement result is exact, and the multifold organic constituent desorption efficiency in the active carbon pipe can be detected. The measuring method comprises the specific steps of: A, measuring each component content in a stripping liquid generated by desorption of active carbon to be measured; B, preparing a standard solution according to each component content; C, taking out the section of a blank active carbon pipe to be measured, and adding a standard solution to carry out equilibrium and D, desorbing and measuring each component content, and calculating a desorbing efficiency. The method provided by the invention solves the problem of the components which differ greatly in concentration have mutual interference caused by desorption competing in a desorption to the stripping liquid process, and real process of the sample desorption is reflected furthest.

Description

Technical field: [0001] The invention relates to a method for measuring desorption efficiency, in particular to a method for measuring the desorption efficiency of various organic units in activated carbon tubes. Background technique: [0002] At present, the method of sampling the concentration of volatile organic compounds in the air using activated carbon tube sampling is widely used. [0003] After the activated carbon tube collects the air sample, the sample is desorbed. There are two desorption methods: thermal desorption and solvent desorption. However, most units use the solvent desorption method because there is no thermal desorption device. The concentration of the desorption liquid formed after the sample is desorbed by solvent is analyzed by chromatographic equipment, and then the actual concentration of each component in the air is finally obtained by combining the sampling volume and the desorption efficiency of activated carbon. The accuracy of the desorption...

AI Technical Summary

Problems solved by technology

[0011] The activated carbon tube that collects this kind of air sample will have a competitive desorption phenomenon during desorption. The desorption efficiency of substances with high concentration may be higher, while the desorption efficiency of substances with low concentration may be low due to the influence of substances with high concentration.

[0012] At this time, if the desorption efficiency of the standard solution with the closest concentration of each substance in the sample is used to represent the desorption efficiency of a certain substance, it cannot truly reflect the actual situation of the desorption of each component in the sample, and cannot fully consider the relationship between the various substances in the sample. desorption effect

That is to say, the desorption efficiency of each substance obtained by measuring the high, medium and low standard solutions cannot truly reflect the desorption efficiency of each component when the concentration of each component of the sample is greatly different.