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ISO 1576:1988
M00001321
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ISO 1576:1988 Tea -- Determination of water-soluble ash and water-insoluble ash
standard by International Organization for Standardization, 07/01/1988
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The method consists in extractiing of the total ash with hot water, filtration through ashless filter paper, ignition and weighing of the residue to determine the insoluble ash; calculation of the soluble ash by difference.