흑운모의 인위적 풍화와 우라늄 수착 특성

Artificial Weathering of Biotite and Uranium Sorption Characteristics

이승엽, 백민훈, 이재광

Abstract

An experiment for uranium sorption onto fresh and weathered biotites was performed. Aftercentrifugation, concentrations of uranium in the supernatants were analyzed using ICP-MS, and biotitesamples were investigated using XRD and SEM. With powdered biotites (<3 mm in size), we haveconducted uranium sorption experiments about fresh and weathered biotites to obtain uranium sorptionamounts in various pH conditions. The uranium sorption was not high at a low pH (e.g., pH 3), butincreased with increasing pH. There were lower uranium sorption by the weathered biotites than by thefresh ones, and the difference was much larger at higher pH (e.g., pH 11). The lower sorption values ofuranium by the weathered biotites may be caused by a change of mineral surfaces and a chemicalbehavior of surrounding dissolved elements. It seems that the uranium-mineral interaction has beendiminished, especially, in the weathered biotite by a destruction and dissolution of preferential sorptionsites on the mineral surfaces and by the colloidal formation from dissolved elements.

Key Words : 흑운모, 풍화, 우라늄, 수착, 콜로이드, Biotite, Weathering, Uranium, Sorption, Colloid.

Reference

JNFCWT

Online Submission

Korean Radioactive
Waste Society (KRS)

Editorial Office
Contact Information

- Tel: +82-42-861-5851, 866-4157
- Fax: +82-42-861-5852
- E-mail: krs@krs.or.kr

SITE MAP