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ISO 9198:2020 Paper, board and pulp - Determination of water-soluble sulfates
standard by International Organization for Standardization, 09/01/2020
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ISO 9198:2020 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.