ISO 11632 pdf download

ISO 11632 pdf download.Stationary source emissions — Determination of mass concentration of sulfur dioxide — Ion chromatography method 1 Scope This International Standard specifies a method for the determination of the mass concentration of sulfur dioxide emitted from combustion facilities and technical processes, and defines the most important performance characteristics. The method described in this International Standard has been tested for a sulfur dioxide concentration range of 6 mg/m 3 to 333 mg/m 3 with sampling periods of 30 min. It is applicable to mass concentrations of sulfur dioxide exceeding this range by carrying out an appropriate dilution of the sample solutions prior to the analysis or by using larger volumes of absorption solution, and to sulfur dioxide concentrations below this range by extending the sampling period. This International Standard is applicable to the analysis of samples containing negligible levels of sulfur trioxide and volatile sulfates (< 5 % of the expected sulfur dioxide concentration), and ammonia (< 5 mg/m 3 ). All concentrations are based on dry gas at a temperature of 273,2 K and pressure of 1 01 ,3 kPa. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently available valid International Standards. ISO 6879:1 995, Air quality — Performance characteristics and related concepts for air quality measuring methods. ISO 7934:1 989, Stationary source emissions — Determination of the mass concentration of sulfur dioxide — Hydrogen peroxide/barium perchlorate/Thorin method. ISO 7935:1 992, Stationary source emissions — Determination of the mass concentration of sulfur dioxide — Performance characteristics of automated measuring methods. 3 Principle A representative sample of waste gas is extracted via a temperature-controlled probe, filtered and drawn through a hydrogen peroxide solution for a specified time and flow rate. The sulfur dioxide in the waste gas sample is absorbed by the solution and sulfate anions are formed. The mass concentration of sulfate in the absorption solution is subsequently determined using ion chromatography. 4 Reagents During the analysis, use only reagents of recognized analytical grade. The sulfate-free water shall have an electrical conductivity of < 0,01...