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Characterization of Inorganic Phosphate in Noncalcareous Lake Sediments¹

ABSTRACT

Inorganic P added with 0.5M NH₄F to noncalcareous sediments was recovered in the NH₄F and succeeding 0.1N NaOH extractions. Values of NH₄F-P, corrected on the basis of the recovery of P added with the NH₄F reagent, underestimated the total amount of inorganic P capable of interacting with NH₄F, but by less than the corresponding uncorrected values. The amounts of inorganic P extracted by 0.5M NH₄F followed by 0.1N NaOH, by citrate-dithionite-bicarbonate, and by 0.3N NaOH were very similar, the means of the three quantities varying by only 11 ppm. Oxalate-extractable inorganic P exceeded these quantities by an average of 250 ppm but exceeded the sum of NH₄F-P, 1st NaOH-P, and reductant-soluble P by an average of 60 ppm, the difference in the latter comparison being ascribed to the partial or complete dissolution of apatite by the oxalate reagent. Although NH₄F-Al was moderately well correlated with oxalate-Al (r = 0.70) neither variable was related to NH₄F-P. The very high correlations between NH₄F-P, 1st NaOH-P, and reductant-soluble P, on the one hand, and between these three fractions and oxalate- and citrate-dithionite-bicarbonate-extractable Fe, on the other, indicate a common origin for the inorganic P in the three fractions as part of a short range order Fe-rich complex. Apatite was low in all sediments.

¹ Contribution from the Department of Soil Sci. and the Water Chem. Lab., Univ. of Wisconsin, Madison. Supported in part by Federal Water Quality Admin. Project no. WP-01470-01 and Office of Water Resources Res. Project no. 14-01-0001-1961 (B-022WIS), administered through the Univ. of Wisconsin Water Resources Center. Approved for publication by the Director of the Research Division, College of Agricultural & Life Sci., Univ. of Wisconsin, Madison. Acknowledgment is also made of the cooperation and support of the Engineering Exp. Sta.

² Former Visiting Assistant Professor, Associate Professor, Assistant Professor, and Associate Professor, respectively. The address of the senior author is Canada Centre for Inland Water, Burlington, Ontario, Can.

Received for publication December 17, 1970. Accepted for publication March 11, 1971.