Determination of Trimethylselenonium Ion and Its Behavior in Soil

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Trimethylselenonium ion (TMSe^+) is a major urinary metabolite of selenium, and a small amount of TMSe^+ contained in animal urine has been spilled onto soils. Then, a method for the determination of TMSe^+ in soils was developed and the method was applied to the study of the behavior of TMSe^+ in soils. (1) TMSe^+ in soils was quantitatively recovered by repeated extractions with 0.2 mol L^<-1> hydrochloric acid. To separate the TMSe^+ in the extract from other selenium compounds, such as inorganic selenium and seleno-amino acids, cation-exchange chromatography was carried out. After seleno-amino acids adsorbed together with TMSe^+ onto the cation-exchange column were eluted with 0.5 mol L^<-1> ammonium hydroxide solution, the TMSe^+ remaining on the column could be recovered by elution with 1 mol L^<-1> sodium hydroxide solution. The amount of TMSe^+ was determined from the amount of the selenium contained in the sodium hydroxide solution. (2) TMSe^+ was estimated to be a minor component in the forms of organically-bound selenium in air-dried soils, because only a small amount of TMSe^+ was detected in the soils. (3) TMSe^+ added to soils was rapidly decomposed by soil microbes and the major part of the TMSe^+ was directly transformed to gaseous selenium compounds, such as dimethylselenide, probably due to demethylation. The existence of TMSe^+ as one of the stable organically-bound selenium compounds in soil was not confirmed.
社団法人日本土壌肥料学会の論文

Determination of Trimethylselenonium Ion and Its Behavior in Soil

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