ISO 6326-5 : 1989 pdf download – Natura1 gas – Determination of Sulfur compounds – Part 5 : Lingener combustion method.
1 Scope This part of ISO 6326 specifies a method for the determination of total sulfur in natural gas. The method is applicable to yases with sulfur contents between 0,5 mg/m3 and 1 000 mg/m3 With a total sulfur content of more than 0,1 mg sulfur in the absorption solution, visual titration with an indicator can be chosen, whereas for Hower contents turbidimetric titration is preterable. NOTE一tn altpartsofISO6326, 1 m of gas is expressed at normal conditions tσ°e: 101.325kPa). 2 Normative references The following standards contain provisions which, through reterence in this text, constitute provisions of this part of ISO6326. AT Tthe time of publication, the editions indicated were valid. Allr standards are subject to revision, and parties to agreements based on this part of 1SO 6326 are encouraged to investigate the possibility of applying the most recent editions of the standards fisted below. Members of 1EC and 1S0 main- tain registers of currently valid International Standards. ISO 385-1 : 1984, Laboratory glassware – Burettes 一Part 1 ; Generat requirements. Iso 648 : 1977, Laboratory glassware – One /mark pipettes. ISo 1042 : 1983, L aboratory glassware- One-mark volumetric flasks. ISO 3585 : 1976, Glass plant, pipeline and fttings – Properties of borosilicate glass 3.3.
3 Principle A measured volume of gas is burnt with air at atmospheric pressure in a glass combustion apparatus. The resulting sulfur oxides are converted into sulfuric acid by absorption in hydrogen peroxide solution. Depending on the sulfur content of the test gas, the sulfate ions in the absorption solution are determined using either visual titration with an indicator or lur- bidimetric titration. 4 Reagents and materials During the analysis, use only reagents of recogrized analytical grade and only distilled water or water of equivalent purity. 4.1 Hydrogen peroxide, 10 % (m/m) aqueous solution, sulfur-free, as absorbing liquid for the sulfur oxides. 4.2 Activated carbon, for adsorption of sulfur impurities from the combustion air. 4.3 Absorbing liquid : 30 % (m/m) aqueous solution of potassium hydroxide, for the purification of the combustion air. 5 Apparatus The schematic layout of the apparatus is shown in figure 1. Ordinary laboratory apparatus and