1984
DOI: 10.1180/claymin.1984.019.1.11
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Ferrihydrite in pyrophosphate extracts of podzol B horizons

Abstract: The amount of Fe and Al extracted from soil by 0·1 M pyrophosphate (Fep, Alp) has long been used as a criterion in the designation of spodic horizons of podzols (Avery, 1973). Although Adams et al. (1980) showed that in a group of podzolic soils developed from Lower Palaeozoic sedimentary (LPS) rocks Fep was very closely correlated with the quantities of Fe eluviated and illuviated, such evidence validating the use of pyrophosphate is not generally available. Recently there has been renewed interest in the ide… Show more

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Cited by 35 publications
(17 citation statements)
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“…Furthermore the presence of large amounts of non-crystalline Fe in Bs horizons together with the observation that ferrihydrite requires to be peptized by organic fractions to be extractable by pyrophosphate (Kassim et al, 1984) support the contention that transformations of Fe in Bs horizons are tied strongly to its association with organic fractions.…”
Section: Results a N D Discussionmentioning
confidence: 60%
“…Furthermore the presence of large amounts of non-crystalline Fe in Bs horizons together with the observation that ferrihydrite requires to be peptized by organic fractions to be extractable by pyrophosphate (Kassim et al, 1984) support the contention that transformations of Fe in Bs horizons are tied strongly to its association with organic fractions.…”
Section: Results a N D Discussionmentioning
confidence: 60%
“…In addition to organically-bound Fe and Al, sodium pyrophosphate can dissolve both non-crystalline and crystalline Al and Fe minerals in some soils (Schuppli et al 1983;Kassim et al 1984). The fact that AJ, and Fe, concentrations were often greater than separate AJ and Fe, concentrations (Table 2) suggests that pyrophosphate did extract some noncrystalline and/or crystalline Al and Fe from these soils, and therefore does not provide a reliable estimate of organically-bound Al and Fe.…”
Section: Discussionmentioning
confidence: 80%
“…More recently, it has been recognized that pyrophosphate may also peptize fine clays such as ferrihydrite and goethite (Jeanroy and Guillet 1981;Kassim et al 1984; Parfitt and Childs 1988) and thereby seriously overestimate the presence of organic matter (OM)-Fe complexes. Pyrophosphate, however, appears to be a good indicator of OM-A1 complexes (Higashi 1983;Skjemstad et al 1989), although the extraction of small amounts of A1 from allophane has been reported by Farmer et al (1983~).…”
Section: Introductionmentioning
confidence: 99%