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Detection of aluminium coordination in soils and clay fractions using 27 Al magic angle spinning n.m.r.
Author(s) -
WILSON M. A.,
BARRON P. F.,
CAMPBELL A. S.
Publication year - 1984
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1984.tb00275.x
Subject(s) - andosol , aluminium , imogolite , ordination , soil water , chemistry , mineralogy , analytical chemistry (journal) , crystallography , allophane , clay minerals , chromatography , mathematics , soil science , geology , organic chemistry , statistics
SUMMARY Preliminary studies using 27 Al n.m.r. of well characterized size fractions containing imogolite from an Andosol are reported. They demonstrate that 27 Al n.m.r. is a useful complementary tool to X‐ray fluorescence methods for the detection of four‐and six‐fold co‐ordination of aluminium in soils. Whereas the X‐ray method depends on interpolating between standards, this is unnecessary in the n.m.r. method since four‐ and six‐fold coordinated aluminium are clearly resolved. The results demonstrate how aluminium co‐ordination changes in size fractions from the Andosol and confirm that all aluminium in imogolite is in six‐fold co‐ordination. It is also suggested that the Al‐O bond distance in imogolite is 1.82 A.