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The main sources of air pollution are hydrogen sulfide, ammonia, carbon monoxide, nitrogen oxides and sulfur dioxide. Sulfur compounds are the most damaging to various materials. Sulfur oxides accelerate metal corrosion by forming sulfuric acid in the atmosphere and on metal surfaces. Sulfur dioxide is the most harmful pollutant that causes metal corrosion. Sulfur and sulfuric acids damage a wide variety of building materials, including limestone, marble and roofing board.
Sulfur dioxide is the leading gaseous sulfur oxide emissions from the combustion of coal. Sulfur dioxide is one of the most abundant air pollutants released into the air, accounting for about 80 percent of total emissions.
This standard contains performance specifications for automated measuring systems used for the continuous determination of mass concentrations of sulfur dioxide at stationary source emissions. In the ISO 7935 standard, extractive and non-extractive sulfur dioxide measurement methods are presented. Both of these methods allow for zero setting and calibration gases and samples for comparison purposes. When comparing the results obtained with these methods, it is necessary to know the water content of the flue gas in order to correct the flue value according to the dry gas value.
TS ISO 7935 Point source emissions - Determination of mass concentration of sulfur dioxide - Performance characteristics of automatic measurement methods.
