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Soil Manganese: E Values, Distribution of Manganese‐54 among Soil Fractions, and Effects of Drying
Author(s) -
Goldberg S. P.,
Smith K. A.
Publication year - 1984
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1984.03615995004800030018x
Subject(s) - manganese , chemistry , soil water , manganese oxide , water soluble , tracer , environmental chemistry , soil science , geology , physics , organic chemistry , nuclear physics
The Mn labile pool was determined in a wide range of United Kingdom soils, using 54 Mn tracer and two different extractants, CaCl 2 and DTPA. Good agreement was obtained between E values obtained by two different equilibration procedures in CaCl 2 , but for most soils the concentrations of CaCl 2 ‐extractable Mn were considerably lower than the E‐values. Higher E‐values were obtained in DTPA than in CaCl 2 , indicating that the former dissolved some nonisotopically exchangeable Mn. The rate of disappearance of 54 Mn from the soil solution, and its distribution in various fractions, differed greatly between the soils. Generally, the radioisotope labeled all the soil fractions determined, with the majority of 54 Mn associated with the water‐soluble + exchangeable, organically bound and easily reducible oxide fractions. When the labeled soils were subjected to air and oven‐drying, net gains of 54 Mn were observed in the water‐soluble + exchangeable, resistant and residual Mn fractions, with corresponding reductions in the easily reducible oxide fractions. Upon drying, native Mn increased in the water‐soluble + exchangeable and EDTA‐extractable fractions. Possible mechanisms for these changes are discussed.