Single organic matter standard gas concentration detecting device and method

Abstract

The invention discloses a single organic matter standard gas concentration detecting device and method which are used for solving the problem about organic gas concentration analysis in the standard gas production process. The single organic matter standard gas concentration detecting device comprises a gas-liquid phase balance device and a photoelectrocatalysis COD (chemical oxygen demand) measuring device, wherein in the gas-liquid phase balance device, to-be-detected gas enters a prepared standard solution through a valve, a gas pressure relief valve and a sand core filter plate to form small bubbles, and the concentration of organic matters in a liquid phase gradually get stable in the rising process of the bubbles in the liquid; in the photoelectrocatalysis COD measuring device, a TiO2 working electrode is irradiated by ultraviolet light, the organic matters in the liquid phase are oxidized through photoelectrocatalysis, coulomb electric charge is calculated through light current measurement, and a value of COD in the liquid is obtained. The concentration of the organic matters in the liquid is calculated according to an organic matter molecular formula, and the concentration of organic gas in gas is obtained in combination of the henry's law.

Description

technical field [0001] The invention relates to the field of organic standard gas detection, in particular to a detection device and method for the concentration of a single organic standard gas. Background technique [0002] At present, in the production process of the standard gas, it is of great significance to analyze the concentration of organic gases in the standard gas. For the analysis of the concentration of a single volatile organic gas in the standard gas, the most commonly used methods are gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS). process. These detection methods have problems such as complex operation, long time-consuming, difficult separation of some components, and the need to prepare relevant standard curves in advance. In recent years, the technology of liquid-phase photocatalytic determination of chemical oxygen demand (COD) has been developed rapidly. This method of photocatalytic reaction is carried out in a thin-layer mi...

AI Technical Summary

Problems solved by technology

However, this method is only suitable for measuring the content of organic matter in the liquid phase, and the analytical problem of determining the concentration of organic matter in the standard gas is still unsolved

In this regard, Chinese patent CN101915791A discloses "a method and device for detecting the content of total organic matter in gas". The method is to use a photocatalytic phase transfer device to transfer the organic matter in the gas from the gas phase to the liquid phase. The content of organic matter in the phase, but the concentration of organic gas cannot be accurately analyzed, and it is necessary to transfer all the organic matter in the gas phase to the liquid phase for analysis

Images