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The Three-dimensional Redistribution of Water and Solutes in a Frozen Container Medium1


The process of ice formation in media at container capacity was followed by sectioning the frozen medium and determining solute content in each sample using sodium fluorescein as a tracer. H2O apparently moved from the bottom and central interior regions of the container medium to the sides of the container. The phase in which movement occurred is unknown. Fluorescein moved down from the top and central interior regions to the bottom and sides of the container. The final distribution of fluorescein should indicate the location of the majority of liquid H2O due to the exclusion of solutes by ice. In the partially frozen state the greatest amount of liquid water therefore occurs near the container sides – a region normally occupied by a large proportion of the root system.