Molecular weight distribution of humic acids from lake and - terrapub
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Geochemical Journal, Vol. 5, pp. 121 to 132, 1971 Molecular weight distribution of humic acids from lake and marine sediments RYOSHI ISHIWATARI Department of Chemistry, Faculty of Science, Tokyo Metropolitan University; Setagaya, Tokyo, Japan. (Received May 20, 1971; in revised form August 9, 1971) Abstract-Molecular weights of humic acids separated from two lake and three marine sediments were measured by gel filtration through Sephadexes. The results indicate that mol. wt. of humic acid distributes from less than 700 to over 200,000. On the basis of mol. wt. the humic acids are divided into three main groups: (1) components with mol. wt. from 100,000 to over 200,000 (43 -70%), (2) components with mol. wt. from 5,000 to 10,000 (8 -25%) and (3) components with mol. wt. less than 700 (10 -17%). The humic acids gave rise to lower mol. wt. compounds on acid or alkali hydrolysis, but the ratio of the hydrolyzable portion to the total varied from sample to sample. A possible conversion process of sedimentary humic acids is discussed.
Transcript of Molecular weight distribution of humic acids from lake and - terrapub
Geochemical Journal, Vol. 5, pp. 121 to 132, 1971
Molecular weight distribution of humic acids fromlake and marine sediments
RYOSHI ISHIWATARI
Department of Chemistry, Faculty of Science, TokyoMetropolitan University; Setagaya, Tokyo, Japan.
(Received May 20, 1971; in revised form August 9, 1971)
Abstract-Molecular weights of humic acids separated from two lake and three marinesediments were measured by gel filtration through Sephadexes. The results indicate thatmol. wt. of humic acid distributes from less than 700 to over 200,000. On the basis ofmol. wt. the humic acids are divided into three main groups: (1) components with mol.wt. from 100,000 to over 200,000 (43 -70%), (2) components with mol. wt. from 5,000to 10,000 (8 -25%) and (3) components with mol. wt. less than 700 (10 -17%). Thehumic acids gave rise to lower mol. wt. compounds on acid or alkali hydrolysis, but theratio of the hydrolyzable portion to the total varied from sample to sample. A possibleconversion process of sedimentary humic acids is discussed.
