Characterization of the frayed edge site of micaceous minerals in soil clays influenced by different pedogenetic conditions in Japan and northern Thailand(Soil Chemistry and Mineralogy)

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• Radiocesium interception potential (RIP), a quantitative index of a frayed edge site of micaceous minerals, was investigated on test clay minerals (illite, kaolinite, montmorillonite and vermiculite) and soil clays formed under different pedogenetic conditions in the Kinki district of Japan and in northern Thailand to elucidate the effect of pedogenetic weathering on the amount of frayed edge site of micaceous minerals. A frayed edge site is defined as the wedge-shaped intermediate zone between non-expansible (1.0nm) and hydrated (1.4nm) interlayers, on which Cs is selectively adsorbed. The test clay minerals demonstrated unique RIP values closely associated with their charge characteristics. Very small RIP in non-micaceous test minerals (0.006molkg^<-1> in kaolinite; 0.1molkg^<-1> in montmorillonite) supported the fact that negative charges in these minerals do not show selective adsorption of ^<137>Cs. Large RIP values in vermiculite (25.9molkg^<-1>) compared with illitic minerals (4.3molkg^<-1> in silt size; 11.8molkg^<-1> in clay size) suggested that the frayed edge site increased as the expanded layer formed in the micaceous minerals. In northern Thailand soil clays, the absence of a vermiculitic expanded layer was indicated. Periodic wet-dry conditions may restrict K depletion from micaceous minerals in the region. It is concluded that micaceous minerals were weathered without layer expansion and, therefore, the amount of the frayed edge site was regulated by the content of micaceous minerals in northern Thailand. In Japanese soil clays, large RIP values were found in the EB and Bs horizons of a Podzodic profile (SW1), which had large vermiculitic expanded layers like the test vermiculite. However, the RIP values drastically decreased from the Bs to E horizon, maintaining a high vermiculitic layer charge. Thus, intensive weathering in highly acidic soils in Japan might reduce the frayed edge site.

• 社団法人日本土壌肥料学会の論文

著者

• KOSAKI Takashi

  Graduate School of Urban Environmental Sciences Tokyo Metropolitan University

• FUNAKAWA Shinya

  Graduate School of Agriculture, Kyoto University

• Nakao Atsushi

  Graduate School Of Agriculture Kyoto University

• Kosaki Takashi

  Department Of Tourism Science Tokyo Metropolitan University

• Funakawa Shinya

  Graduate School Of Agriculture Kyoto University

• Kosaki Takashi

  Department Of Soil Sciences And Land Resource Faculty Of Agriculture Bogor Agricultural University

• Kosaki Takashi

  Graduate School Of Agriculture Kyoto University

• THIRY Yves

  Radiation Protection Research Unit, Radioecology Section, SCK-CEN, Foundation of Public Utility

• Thiry Yves

  Radiation Protection Research Unit Radioecology Section Sck-cen Foundation Of Public Utility

• Funakawa Shinya

  Department Of Soil Sciences And Land Resource Faculty Of Agriculture Bogor Agricultural University

• Funakawa Shinya

  Graduate School Of Global Environmental Studies Kyoto University:graduate School Of Agriculture Kyot

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