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HERO ID
6701203
Reference Type
Journal Article
Title
Selectivity of reagents used to extract iron from soil
Author(s)
Vodyanitskii, YuN; Vasil'ev, AA; Morgun, EG; Rumyantseva, KA; ,
Year
2007
Is Peer Reviewed?
Yes
Journal
Eurasian Soil Science
ISSN:
1064-2293
EISSN:
1556-195X
Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
Location
NEW YORK
Page Numbers
1076-1086
DOI
10.1134/S1064229307100055
Web of Science Id
WOS:000250512000005
URL
http://link.springer.com/10.1134/S1064229307100055
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Abstract
The selectivity of the Tamm and Mehra-Jackson reagents to iron (hydr)oxides was verified chemically by comparing the efficiencies of the two methods of iron extraction: parallel (commonly adopted) and sequential, i.e., by calculating the difference Delta Fe = [Fe-dit - (Fe-ox(paral) + Fe-dit(seq))]. The expected equality of the extracted iron (i.e., Delta Fe similar to 0) is rarely observed. A positive balance reaching Delta Fe = (0.5-0.8)% predominates upon iron extraction from forest soils of the Cis-Ural region. This is probably due to the stable Fe(II)-oxalate forming in the course of the Tamm extraction, which is incompletely dissolved by the dithionite-citrate-bicarbonate (DCB). On the contrary, a negative balance with Delta Fe reaching -0.4% predominates in the steppe soils of the Stavropol region. This may be caused by Fe(II) minerals (pyrite and siderite) acting as catalyzers in Tamm's extract, while being weakly soluble in the DCB. To follow the additivity principle for the Tamm and Mehra-Jackson extracts, we suggest a modification of the Schwertmann criterion K-Sch = (Fe-ox: Fe-dit(paral)), which sometimes exceeds 1, to K-Sch (m) = Fe-ox: (Fe-ox + Fe-dit(seq)), which is always less than 1. The values of the modified Schwertmann criterion better agree with the color of the Cis-Ural forest soils expressed in the CIE-L*a*b* optical system as compared with the initial Schwertmann criterion. In the steppe soils, the use of the modified criterion makes it possible to replace the illogical values of K-Sch = 1.11-1.37 by the quite acceptable K-Sch(m) = 0.68-0.83.
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