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Clays and Clay Minerals; December 2005; v. 53; no. 6; p. 653-658; DOI: 10.1346/CCMN.2005.0530611
© 2005 Clay Minerals Society
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STRUCTURAL CHANGES OF ALLOPHANE DURING PURIFICATION PROCEDURES AS DETERMINED BY SOLID-STATE 27Al AND 29Si NMR

Syuntaro Hiradate*

Department of Biological Safety Science, National Institute for Agro-Environmental Sciences (NIAES), 3-1-3 Kan-nondai, Tsukuba, Ibaraki 305-8604, Japan



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  		Figure 1. Purification procedure of allophane from weathered pumice (Murasakino pumice; 40,000–70,000 y BP).

 


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  		Figure 2. Solid-state 27Al and 29Si NMR spectra of untreated (KiP-G) and 6% H2O2-treated (KiP-GH) ground pumice.

 


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  		Figure 3. Solid-state 27Al and 29Si NMR spectra of coarse sand (KiP-GHFCS; 500–63 µm), fine sand (KiP-GHFFS; 63–20 µm), silt (KiP-GHFST; 20–2 µm), coarse clay (KiP-GHFCC; 2–0.2 µm), and fine clay (KiP-GHFFC; <0.2 µm) fractions of the H2O2-treated ground pumice (KiP-GH).

 


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  		Figure 4. Comparison of solid-state 27Al and 29Si NMR spectra between before-(KiP-GHFFC) and after-(KiP-GHFFCD) dithionite-citrate-bicarbonate treatment of the fine clay fraction of the H2O2-treated ground pumice.

 


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  		Figure 5. Influence of 5% Na2CO3 treatment on solid-state 27Al and 29SiNMRspectra of allophane. KiP-GHFFCD; untreated control, KiP-GHFFCDSC16; incubated for 16 h at room temperature, KiP-GHFFCDSH005; boiling for 0.5 h, KiP-GHFFCDSH01; boiling for 1 h, KiP-GHFFCDSH02; boiling for 2 h, KiP-GHFFCDSH04; boiling for 4 h, KiP-GHFFCDSH08; boiling for 8 h.

 




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