Soil Organic Matter as Related to Newer Concepts of Lignin Chemistry

Gottlieb, Sidney; Hendricks, S. B.

doi:10.2136/sssaj1946.03615995001000c00019x

Cited by 22 publications

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“…Alexander & Byers (1932) modified this method by using fewer treatments with a stronger solution of hydrofluoric and hydrochloric acids to dissolve the hydrated silicate minerals, and their modified procedure was employed by Broadbent & Bradford (1952) to obtain soils free of inorganic exchange materials for investigations on the cation-exchange properties of soil organic matter. Gottlieb &Hendricks (1946) adapted Rather's method of dissolving mineral matter to prepare a mineral soil fraction containing a high percentage of organic matter, and separated material containing 32-6 % carbon by HF-HCl treatment of * Present address: National Institute of Agricultural Soieaces, Kita-Ku, Tokyo, Japan. the fine (< 0-1 //.)…”

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Release of ammonium and organic matter from soil by hydrofluoric acid and effect of hydrofluoric acid treatment on extraction of soil organic matter by neutral and alkaline reagents

Bremner

Harada

1959

J. Agric. Sci.

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1. The effect of treating mineral soils with hydrofluoric acid to decompose clay minerals on the extraction of soil organic matter by alkaline and neutral reagents has been investigated.2. It was found that treatment of soil with hydrofluoric acid had little effect on the extraction of organic matter by alkaline or neutral reagents, but that it released considerable amounts of ammonium and organic matter. More than 90% of the nitrogen in Rothamsted soils was dissolved by repeated treatments with dilute solutions of hydrofluoric acid and sodium hydroxide.3. It is shown that treatment of clay minerals with n-HF:n-HCl solution at room temperature for 24 hr. effects quantitative release of fixed ammonium from clay minerals and that similar treatment of soil is not likely to cause significant decomposition of organic nitrogen compounds to ammonium. It is suggested that a method based on this treatment may prove useful for the determination of fixed ammonium in soil. Results obtained by this method indicated that 4–8% of the nitrogen in surface soils and 19–45% of the nitrogen in subsoils examined was in the form of fixed ammonium.4. It is concluded that some mineral soils contain a significant quantity of ammonium and organic matter intimately associated with clay minerals and that this clay-bound material is not dissolved by neutral and alkaline reagents used for the extraction of soil organic matter, but is released by hydrofluoric acid.

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confidence: 99%

Release of ammonium and organic matter from soil by hydrofluoric acid and effect of hydrofluoric acid treatment on extraction of soil organic matter by neutral and alkaline reagents

Bremner

Harada

1959

J. Agric. Sci.

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“…Many investigators have used high pressure hydrogenation and hydrogenolysis to reduce humic substances (Gottlieb and Hendricks, 1946;Kukharenko and Savelev, 1951;Kukharenko and Savelev, 1952;Murphy and Moore, 1960;Felbeck, 1965). Many of these investigations resulted in the formation of colorless oils but in only one case were products identified; a C 25 or C 26 n-alkane was identified in the reduction products of humic acids from a muck soil (Felbeck, 1965).…”

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confidence: 99%