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Suitability of Freezing as a Method of Preserving Runoff Samples for Analysis of Soluble Phosphate
Author(s) -
Nelson D. W.,
Römkens M. J. M.
Publication year - 1972
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1972.00472425000100030028x
Subject(s) - surface runoff , phosphate , sediment , liquid nitrogen , chemistry , congelation , environmental chemistry , nitrogen , liquid phase , chromatography , geology , biochemistry , ecology , biology , paleontology , physics , organic chemistry , thermodynamics
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.