Historical developments in quantitative organic micro analysis

Steyermark, Al

doi:10.1016/0026-265x(58)90004-3

Cited by 4 publications

(1 citation statement)

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“…The carbon contents of the clays were determined by a micro-dry combustion method using WO3 to ensure complete combustion (Steyermark, 1961). Total K of each fractionated and differently treated clay was determined using the HF-HCIO 4 decomposition method of Jackson (1958).…”

Section: Methodsmentioning

confidence: 99%

Relation of Potassium Exchange and Fixation to Degree of Weathering and Organic Matter Content in Micaceous Clays of Podzol Soils

Ross¹

1971

Clays and clay miner.

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Abstract-The rates of K exchange of untreated and peroxide-treated micaceous clays from five Podzol soils of increasing degrees of weathering were determined using sodium tetraphenyl boron. In addition, the amounts of K fixed against NH4 were measured. The Ae horizon clays of these soils contained mainly interstratified mica-vermiculite-montmorillonite whereas the C horizon clays contained mica of a more discrete nature.As was expected, there was an inverse relationship between rates of K exchange and degrees of weathering of the Ae horizon clays. However, in the samples from each of these soils except in those of the most weathered one, the K exchange rate of the interstratified mica from the Ae horizon was higher than that of the less weathered, more discrete mica from the corresponding C horizon. The abundance of hydrated edges and layers exposing K exchange sites in the Ae horizon micas probably contributed to their higher rates of K exchange. Amounts of K fixed in the Ae horizon clays were not related to degrees of weathering.Removal of organic matter from the Ae horizon clays by peroxide considerably increased both the rates of K exchanged and the amounts of K fixed. These increases were attributed to the elimination of a blocking effect of adsorbed organic matter on K exchange and fixation.

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Section: Methodsmentioning

confidence: 99%