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The Detection and Analysis Methods of the SO2 Analyzer

The Detection and Analysis Methods of the SO2 Analyzer

Sulfur dioxide in the atmosphere is an important indicator of atmospheric environmental quality assessment. It is mainly derived from the oxidation of sulfur contained in the combustion of sulfur-containing fossil fuels when burning. Because of the widespread use of fossil fuels, sulfur dioxide is the main air pollutant.


The SO2 analyzer is suitable for the corrosion test of sulfur dioxide and hydrogen sulfide gas. The SO2 analyzer has the following functions: it can monitor the temperature, static pressure and the volume concentration and mass concentration of sulfur dioxide in the flue in real time; save the test data for a long time, and can check the test data at any time.


The SO2 analyzer uses appropriate monitoring and analysis methods to do SO2 monitor and determinayion the sulfur dioxide content in the atmosphere.


1. The dual optical path sulfur dioxide fluorescence detection method theoretically eliminates the measurement error of sulfur dioxide caused by the change of gas composition. Through experimental analysis, this method is significantly better than the single optical path detection method, and has a greatly improvement in selectivity, sensitivity, and anti-interference ability.


2. In the determination of pararosaniline hydrochloride method, a porous glass absorption tube filled with potassium tetrachloromercury solution is used to collect sulfur dioxide in the atmosphere. During the sampling process, sulfur dioxide reacts with the absorption liquid to form a complex. In the sampled absorption solution, when formaldehyde and pararosaniline hydrochloride are added, a purple-red compound is formed. This compound has a strong absorption effect on visible light at 548 nm. Within a proper concentration range, the absorbance is linearly related to the concentration of sulfur dioxide. Therefore, by measuring the absorbance of the standard solution and the sample solution, the content of sulfur dioxide in the atmosphere can be determined. This method has  the advantages of high sensitivity, strong anti-interference ability, and stable after sample collection. The disadvantage is that the potassium mercury tetrachloride solution is more toxic.


3. In the determination of SO2 analyzer methods, the UV fluorescence method is better. It uses 190nm-230nm ultraviolet light to excite sulfur dioxide molecules to emit fluorescence, and the fluorescence intensity is proportional to the concentration of sulfur dioxide. A SO2 monitoring equipment based on this principle was used in 1976. This method has high sensitivity, strong selectivity, simple operation, and is suitable for continuous automatic determination of sulfur dioxide in the atmosphere.

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