Migration behavior of minor and rare earth elements in acidic soils and its controlling factors

• Published in: Shigen-Chishitsu Vol. 55; no. 2; pp. 169 - 180
• Main Authors: OTANI, Haruhiro, SHIKAZONO, Naotatsu, KUBOTA, Ran
• Format: Journal Article
• Language: English; Japanese
• Published: The Society of Resource Geology 2005; 資源地質学会
• Subjects: adsorption; andosol; clay minerals; elemental mobility; minor elements; rare earth elements; red soil; weathering
• ISSN: 0918-2454; 2185-4033
• DOI: 10.11456/shigenchishitsu1992.55.169

The present study examines the migration behavior of minor and rare earth elements(REEs) in acidic soils such as andosol, loam and red-yellow soil. Al normalized values calculated from analytical results clearly indicate that the mobility of Ca, Mg, Sr and REEs in loam and red-yellow soil is smaller than that in andosol. The difference in the mobility of these elements is considered to have been caused by the different soil constituent minerals. Especially, the mobility of the REEs depend greatly on the type of clay mineral in soil. In the red-yellow soil containing illite, smectite and vermiculite, the lower mobility of light REEs compared with heavy REEs is controlled by the adsorption by these secondary minerals. On the other hand, in the andosol containing allophone, the higher mobility of the light REEs is controlled by the adsorption by allophane. This may be related to different hydrated ionic radii of each REE.