| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for preliminarily separating soil main components and uranium and/or thorium, and to provide a method for accurately quantifying trace small amount of uranium and/or thorium by an ICP mass spectrometric analysis method. SOLUTION: Nitric acid, hydrochloric acid and aqueous hydrogen peroxide are added to soil, containing at least uranium and/or thorium to allow the soil to left standing until the completion of reaction. Subsequently, hydrofluoric acid is added to the soil to volatilize and remove silicic acid that is the soil main component by heating dissolution and drying operation, nitric acid is added to the soil to again heat and dry the soil to decompose a part of thorium fluoride formed by pretreatment, uranium and/or thorium is made to adsorb by an anionic ion exchange resin in the nitric acid liquid of a next process and nitric acid is further added to separate and remove the soil main components, other than silicic acid. Thereafter, an ICP mass spectrometric analysis method is applied to a measuring technique. COPYRIGHT: (C)2008,JPO&INPIT
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