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Why Is Oxalic Acid Used In Removing Iron I Kaolin

Oxaliccitric acid is added to the sample and allowed to set for two minutes.The oxaliccitric acid is used to remove any interferences from phosphate and decrease interferences from tannin.The sample is then run photometrically.The down side to this method is the instability of the color produced.Heteropoly blue method.

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