A very pure filter paper with medium filtration speed. Exempt of phosphates and potassium, and low on the content of ni- trogen. Special for analysis of soils according to Ehmer, Riehm and Lederle, determination of phosphates and nitrates in minerals and the analysis of the components of nitrogen in products like beer and other specific assays Kjeldahl before the digestion.
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Filter paper free of K and P, low of N

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