GB/T 38685-2020Determination of sulphuric acid mist in tail gas for sulphuric acid industry (English PDF)

1 Scope

This standard specifies the method for the determination of sulfuric acid mist in exhaust gas from sulfuric acid industry.

This standard is applicable to the determination of sulfuric acid mist in exhaust gas emitted from stationary pollution sources of sulfuric acid production enterprises.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this article

Pieces. For the cited documents without date, the latest version (including all amendments) applies to this document.

Preparation of GB/T 601 chemical reagent standard titration solution

GB/T 603 Preparation of preparations and products used in chemical reagent test methods

GB/T 6682 Analysis laboratory specifications and test methods

GB/T 16157 Determination of particulate matter in exhaust gas from stationary sources and sampling method of gaseous pollutants

3 Terms and definitions

The following terms and definitions apply to this document.

4 Principle

Use glass fiber filter cartridges or quartz fiber filter cartridges to connect the absorption bottles of isopropyl alcohol solution in series to collect the sulfur in the tail gas discharged from stationary pollution sources

Acid mist. The sampling filter cartridge captures small droplets of sulfuric acid, and the sulfuric acid content is determined by acid-base titration, which is converted to sulfuric acid mist content rho1;

The isopropyl alcohol solution captures sulfur trioxide gas and fine droplets that penetrate the filter cartridge, using the thorium reagent as an indicator, and titrating the solution with a standard barium perchlorate titration solution

Determine the generated sulfate radicals and calculate the sulfuric acid mist content rho2 in the absorption liquid; add the sulfuric acid mist content in the sampling filter cartridge and the isopropyl alcohol absorption liquid,

Calculate the sulfuric acid mist content in the exhaust gas (rho = rho1 rho2).

5 General provisions

The reagents and water used in the test refer to analytically pure reagents and tertiary water specified in GB/T 6682 when no requirements are indicated.

The standard titration solutions, preparations and products used are prepared according to the provisions of GB/T 601 and GB/T 603 unless other requirements are indicated.

6 Reagents or materials