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What digestion procedure should be used for total phosphorus determination: Kjeldahl or persulfate?

April 26, 2017determination digestion kjeldahl persulfate Phosphorus procedure total Used

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What digestion procedure should be used for total phosphorus determination: Kjeldahl or persulfate?

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If the samples are going to be analyzed for Kjeldahl nitrogen as well, the same digestion would take of the total phosphorus. The persulfate digestion (autocalve) is usually preferred if the only analyte of interest is phosphorus.