Fractionation of Phosphorus in Lake Sediments: Analytical Evaluation
1969
Methods for the fractionation of P in soils were evaluated in the fractionation of P in lake sediments. Both Al-P and Fe-P may be determined readily and precisely by the Chang and Jackson procedure. Reductant-soluble P was more difficult: modifications of a citrate oxidation procedure utilizing KMnO₄ produced an acceptable method. Large amounts of Fe in the Ca-P extracts caused low results, but this was overcome by limiting the aliquot size. Organic P determined by difference between total and inorganic P was not related to the organic matter content of the sediments. An alternative measure of inorganic P, obtained by summing the inorganic P fractions, yielded values for organic P which were correlated with organic matter.
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