define organic impurities
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Organic Impurities in Fine Aggregate. If aggregate contains organic impurities it may not be suitable for inclusion in concrete. Organic impurities, usually tannic acid and its derivatives, may interfere with the chemical reactions of hydration.Impurities are more likely to be found in fine (sand) aggregate
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Organic Impurities in Chemical Drug Substances. Impurities are unwanted coexisting components in bulk pharmaceutical chemicals that arise during manufacture and/or subsequent storage.
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