Suitability of Freezing as a Method of Preserving Runoff Samples for Analysis of Soluble Phosphate
1972
Nelson, D. W. | Römkens, M. J. M.
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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