Sorption of Tc(IV) in Saline Solutions – I. Sorption on MX-80 and Granite in Ca-Na-Cl Solutions

• 발행기관: 한국방사성폐기물학회
• 저자명: Shinya Nagasaki Zhiwei Zheng Jianan Liu Jieci Yang Tammy (Tianxiao) Yang
• 간행물 정보: 『Journal of Nuclear Fuel Cycle and Waste Technology (JNFCWT)』Vol.22 No.3, 273~285쪽, 전체 13쪽
• 주제분류: 공학 > 공학일반
• 파일형태: PDF
• 발행일자: 2024.09.30

국문 초록

Technetium-99 is identified as an element of interest for the safety assessment of a deep geological repository for used nuclear fuel. The sorption behavior of Tc(IV) onto MX-80 and granite in Ca-Na-Cl solutions of varying ionic strength (0.05–1 mol·kgw−1 (m)) and across a pHm range of 4–9 was studied in this paper. Sorption of Tc(IV) was found to be independent of ionic strength in the range of 0.05 to 1 m for both MX-80 and granite. Sorption of Tc(IV) on MX-80 increased with pHm from 4 to 7 and then decreased with pHm from 8 to 9. Sorption of Tc(IV) on granite gradually increased with pHm from 4 to 8 and then became almost constant or slightly decreased with pHm from 8 to 9. A 2 site protolysis non-electrostatic surface complexation and cation exchange sorption model successfully simulated sorption of Tc(IV) on MX-80 and granite. Optimized values of surface complexation constants (log K0) are proposed.

키워드

Technetium(IV) Sorption Granite MX-80 Saline 2SPNE SC/CE model