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. 2021 Feb:168:109465.
doi: 10.1016/j.apradiso.2020.109465. Epub 2020 Nov 12.

Supercritical water pretreatment method for analysis of strontium and uranium in soil (Andosols)

Mika Nagaoka  1 , Hiroki Fujita  1 , Taku Michael Aida  2 , Haixin Guo  3 , Richard Lee Smith Jr  4
Affiliations

Supercritical water pretreatment method for analysis of strontium and uranium in soil (Andosols)

Mika Nagaoka et al. Appl Radiat Isot. 2021 Feb.

Abstract

Hydrothermal pretreatment of soils (Andosols) from Ibaraki prefecture (Japan) was used to improve methods for monitoring radioactive Sr and U. Calcined samples were pretreated with subcritical or supercritical water (SCW) followed by extraction with 0.5 M HNO3 solutions. With SCW pretreatment, recoveries of Sr and U were 70% and 40%, respectively. Experimental recoveries obtained can be described by a linear relationship in water density. The proposed method is robust and can lower environmental burden of routine analytical protocols.

Keywords: Analytical methods; Hydrothermal pretreatment; Soil monitoring; Strontium; Uranium.

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