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Medientyp:
E-Artikel
Titel:
THE MOBILIZATION AND FIXATION OF MOLYBDENUM, VANADIUM, AND URANIUM BY DECOMPOSING PLANT MATTER
Beteiligte:
BLOOMFIELD, C.;
KELSO, W. I.
Erschienen:
Wiley, 1973
Erschienen in:Journal of Soil Science
Sprache:
Englisch
DOI:
10.1111/j.1365-2389.1973.tb00772.x
ISSN:
0022-4588
Entstehung:
Anmerkungen:
Beschreibung:
<jats:title>Summary</jats:title><jats:p>Mo, V, and U are mobilized as anions by aerobically decomposing plant matter; the behaviour of the dissolved metals differs in several respects from what would be expected in inorganic systems.</jats:p><jats:p>With respect to dialysis through cellophane, between pH I and 4 the mobilized Mo is fixed by colloidal organic decomposition products, with maximum retention at pH 1.5; V is retained between pH 1.5 and 7.0, with a maximum at pH 3. The specific fixation of Mo and V by soil organic matter was considerably less, and persisted over wider pH ranges–1.5‐6.5 and 1.0‐9.0 respectively. The fixation of U by both forms of humified organic matter increased sharply to a maximum around pH 4‐5, and thereafter decreased slightly up to pH 8.</jats:p><jats:p>The anionic forms of the three elements persisted when MOO:<jats:sub>2‐</jats:sub><jats:sup>4</jats:sup>, VO;‐<jats:sup>3</jats:sup> and UO, were incubated with anaerobically decomposing plant matter; under these conditions V(V) was probably reduced to V(IV), and it seems that an anionic V(IV) complex was formed.</jats:p><jats:p>Although the molecular size of the colloidal decomposition products of lucerne was somewhat less than that of organic matter extracted from Rothamsted top soil, acid hydrolysates of the two humic acids contained the same twenty‐three amino acids, in much the same relative proportions.</jats:p>