ISO 9198 pdf download

ISO 9198 pdf download.Paper, board and pulp — Determination of water-soluble sulfates 1 Scope This International Standard specifies a method for the determination of water-soluble sulfates in all types of pulp, paper and board. The lower limit of the determination is 20 mg of sulfate ion per kilogram of dry sample. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 1 86:1 994, Paperandboard— Sampling to determine average quality. ISO 287:1 985, Paperandboard— Determination ofmoisture content— Oven-drying method. ISO 638:1 978, Pulps — Determination ofdrymattercontent. ISO 721 3:1 981 , Pulps — Sampling fortesting. 3 Term and definition For the purposes of this International Standard, the following term and definition applies. 3.1 water-soluble sulfates ? in pulp, paper and board ? amount of sulfate ion that is extracted with water at 23 °C and determined under the conditions specified 4 Principle Pieces of the sample are extracted with water at 23 °C in a disintegrator. An aliquot of the resulting suspension is used for determination of the sulfate ion content by ion chromatography. 5 Reagents Use only reagents of recognized analytical quality and only water as specified in 5.1 . 5.1 Distilled water or deionized water, of conductivity less than 0,1 mS/m at 25 °C. 5.2 Sulfate stock solution, ? (SO 4 –2 ) = 1 000 mg/l. Dry a portion of potassium sulfate (K 2 SO 4 ) at 1 40 °C. Transfer 1 81 ,5 mg ? 2 mg thereof to a 1 00 ml volumetric flask, dissolve the salt and make up to the mark with water (5.1 ). Commercially available standard solutions can be used. 5.3 Sulfate matching solution Dilute the sulfate stock solution (5.2) with water (5.1 ) to a sulfate ion concentration of, for example, ? (SO 4 –2 ) = 1 0 mg/l. Do not use sulfate matching solutions that are more than 1 week old. 5.4 Other solutions, as specified in...