Refining total oxygen content in the solid phase of soils

Abstract

Expression of the total chemical analysis in the form of oxides has significant drawbacks: this conditional form does not correspond to the actual content of soil minerals. Oxide form distorts the view of the relationship between the different elements in the soil. It is obvious that the total chemical composition should be expressed in the form of elements including oxygen - the element with the maximal Clarke. Thus it is necessary to consider the amendment on oxygen loss on ignition of the soil. The studied soil on amendments to oxygen can be divided into three groups. For spodosols of Russian plain after amendments oxygen content increases slightly and total chemical composition of practically does not change. For vertisols of southern Siberia after amendments oxygen content increases by 3 - 4%. Not accounting for this fact leads to a noticeable error in the content of K. For oxisols in Norfolk Island with a high proportion of unstable gibbsite after amendments content O increases by 7 - 8%. This leads to a noticeable error in the contents: O, Al, Fe and Ti in particular. For oxisols the amendment of oxygen is required.

References

1. Kovda I., Goryachkin S., Lebedeva M. et al. Vertic soils and Vertisols in cryogenic environments of Southern Siberia, Russia // Geoderma. 2017. Vol. 288.

2. Vodyanitskii Yu.N. Elements oxides as a sours of errors in the gross chemical composition of soil and way to eliminate the errors // Annals Agricult. Sci. 2018. Vol. 16, N 1.

3. Vodyanitskii Yu.N., Minkina T.M., Kubrin S.V., Linnik V.G. Iron sulphides and their effect on the XRF measurement of the bulk chemical composition of badlend soils near the Karabash copper smelter, Southren Urals, Russia // Geochem.: Explor., Environ., Analys. 2018. N 6.