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This article in JEQ

  1. Vol. 1 No. 3, p. 323-324
     
    Received: Oct 13, 1971


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doi:10.2134/jeq1972.00472425000100030028x

Suitability of Freezing as a Method of Preserving Runoff Samples for Analysis of Soluble Phosphate1

  1. D. W. Nelson and
  2. M. J. M. Römkens2

Abstract

Abstract

Slow freezing of surface runoff samples decreased the levels of soluble orthophosphate in the water phase from 2 to 27%, but low temperature storage at 2C for 3 days or freezing of the water phase after sediment removal did not alter the orthophosphate concentrations of samples. Rapid freezing of runoff samples in liquid nitrogen resulted in decreases in orthophosphate content which were about one-half of those observed for conventional freezing. Frozen storage is not a good method for preserving runoff samples to be analyzed for soluble phosphate unless sediment is removed prior to freezing.

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