PREPARATION OF LOW-ASH HUMIC ACIDS, AND THE ACCOMPANYING LOSSES OF ORGANIC MATERIAL, FROM CANADIAN LAKE SEDIMENTS AND A GLEYSOL

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Abstract

Treatment with dilute hydrofluric acid, acid precipitation and washing, dialysis, and subfractionation with ultrafiltration membranes were used to prepare humic acids and two subfractions of them with barely detectable ash content. A soil and sediments from nine lakes in different areas and with different chemistry and trophic levles were so treated. Total losses of organic matter averaged 57 percent, with a range of 47 to 67 percent. Losses at each step were determined, the greatest being during ultrafiltration.

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