An accurate determination method for pyrolysis products of humic acid organic matter

Abstract

The invention discloses an accurate determination method for pyrolysis products of humic acid organic matter, specifically an ion chromatography eluent gradient program method for precise analysis and detection of humic acid organic matter pyrolysis products in the water vapor system of a thermal power plant. The pyrolysis products of humic acid organic matter are mainly low-molecular organic acids and corrosive inorganic anions. The specific steps are as follows: filter the humic acid organic matter pyrolysis liquid through a 0.45 μm microporous membrane, concentrate the sample volume, and inject it into an ion chromatograph In the quantitative sampling loop; the detection conditions of the ion chromatography eluent gradient program method are: the column temperature of the anion analysis column and the guard column is 30 ° C ± 0.1 ° C, the eluent is K2B4O7 solution, gradient elution, leaching The flow rate of the washing solution was controlled at 1.00mL / min, the current of the suppressor was controlled at 60mA, and the injection volume was 500µL. The analysis method of the present invention has the smallest standard deviation on the premise that the detection limit of each ion is the lowest, and is suitable for rapid and accurate detection of humic acid organic matter pyrolysis products in a water vapor system of a thermal power plant.

Description

technical field [0001] The invention relates to a method for accurate determination of high-temperature decomposition products of humic acid organic compounds, in particular to an accurate analysis and detection of the high-temperature decomposition products of humic acid organic compounds in a water vapor system of a thermal power plant by using an ion chromatography eluent gradient procedure method. Background technique [0002] With the rapid development of the power industry, the "condensing steam turbine heating transformation" has also been rapidly popularized. In order to meet the heating requirements of the unit, the amount of make-up water has also increased, and the organic matter brought in by the make-up water has also increased significantly, while the humic acid organic matter It is a main representative of organic matter. In thermal power generation systems, humic acid organic matter decomposes under high temperature and high pressure environment, resulting in ...

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Problems solved by technology

[0003] Ion chromatography is a traditional detection method born in the mid-1970s. It is an important branch of high performance liquid chromatography. It is currently the main detection method for the detection of anion and cation compound content. It has important applications and has become a powerful tool to study and deal with corrosion problems of power equipment. However, the application of conventional analytical ion chromatography in actual power plant operation has many defects. First, the flow rate of conventional analytical ion chromatography is very large, so it is difficult to do Continuous start-up operation requires a large volume of samples, which limits the large-scale water vapor detection. Secondly, for the current thermal system, the water vapor composition has become relatively complex, and the pyrolysis products of humic acid organic compounds also have low molecular weight. For organic acids and inorganic anions, for these complex samples, because there are large differences in the affinity of different types of ions to common ion chromatography column stationary phases, it is difficult to find a suitable eluent type and concentration to separate them, which is likely to cause detection errors , therefore, it is necessary to improve the method on the original conventional analytical ion chromatography method

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