Effect of Carbonate on the Migration Behavior of Strontium in Compacted Bentonite

Kazuya Idemitsu, Ryota Yamada, Masayuki Hirakawa, Yuki Kakoi, Hajime Arimitsu, Yaohiro Inagaki, Tatsumi Arima

Research output: Contribution to journalArticle

Abstract

The apparent diffusion coefficients of strontium in compacted bentonites were investigated at various concentrations of NaHCO3. Purified sodium bentonite Kunipia-F® was compacted with a jig into cylindrical pellets 10 mm in diameter and 10 mm high with dry densities of 1.0 to 1.6 Mg/m 3 . Each bentonite pellet was inserted into an acrylic resin column and saturated with carbonated water containing 0.1 to 1.0 M NaHCO3 for more than 1 month. The face of the bentonite specimen was spiked with 5 μL of 1.0 M SrCl2 tracer solution. After a few weeks, the strontium diffusion profiles were measured by inductively coupled plasma-mass spectrometry. The apparent diffusion coefficients of strontium decreased slightly with increasing dry density. NaHCO3 concentrations of 0.5 M decreased the apparent diffusion coefficients of strontium by half at a dry density of 1.0 Mg/m 3 and quarter at 1.6 Mg/m 3 . At a higher NaHCO3 concentration of 1.0 M, no strontium diffusion profile was observed, whereas white precipitate was observed on the face of the bentonite specimen where it was spiked with strontium. This white precipitate could be strontianite, which is strontium carbonate. Diffusion experiments using cesium were carried out for comparison, and the presence of carbonate had no effect on the apparent diffusion coefficient.

Original languageEnglish
Pages (from-to)1021-1027
Number of pages7
JournalMRS Advances
Volume4
Issue number17-18
DOIs
Publication statusPublished - Jan 1 2019

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Effect of Carbonate on the Migration Behavior of Strontium in Compacted Bentonite'. Together they form a unique fingerprint.

  • Cite this