INVESTIGATIONS ON THE SEPARATION OF URONIDES FROM SOILS

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Abstract
The solubility of the uronides of a muck, 2 soils and cornstalk composts in 1% cold Na2CO3 and NaOH and 0.5% hot ammonium oxalate and acetyl bromide is given. The investigation represents preliminary steps necessary for the final separation and identification of uronides in pure form from soils. The quantity of uronic carbon extracted by the cold alkali treatment was about proportional to the amt. of nonuronic C extracted, being roughly 1/3-1/2 of that originally present. Hot ammonium oxalate and acetylation treatment appeared to solubilize a slightly greater proportion of uronic than nonuronic C of soils. The rate of decarboxylation of the extracted residues of muck, soils and composts differed little from that of the original materials or the extracts. Well-decomposed cornstalk composts behaved more like soil organic matter to the separation treatments than fresh cornstalks.

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