Extractability of manganese and iron oxides in typical Japanese soils by 0.5molL^<-1> hydroxylamine hydrochloride (pH 1.5)(Soil chemistry and soil mineralogy)
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概要
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We investigated the extractability of manganese (Mn) and iron (Fe) oxides from typical Japanese soils (Entisols, Inceptisols, and Andisols) by 0.5molL^<-1> hydroxylamine hydrochloride (NH_2OH-HCl) extraction (pH 1.5; 16h shaking at 25℃; soil:solution ratio 1:40), referred as to HH_<mBCR>, which is Step 2 (used for the reducible fraction) of the modified BCR (Community Bureau of Reference) sequential extraction procedure. The HH_<mBCR> procedure extracted almost all Mn oxides from the non-Andisol samples, but failed to extract a part of the Mn oxides from some Andisol samples. The procedure extracted most short-range ordered Fe oxides from non-Andisol samples, but it extracted only 7.5% and 13% of the short-range ordered Fe oxides from allophanic and non-allophanic Andisol samples, respectively. This remarkably low extractability of Fe oxides suggests that the HH_<mBCR> method is not suitable for extracting oxide-occluded heavy metals from Andisols. Since the extraction rate of short-range ordered Fe oxides from various soils with the extractant was negatively correlated with the amounts of oxalate- and pyrophosphate-extractable Al even when the variability of the extraction pH was reduced by increasing the soil:solution ratio from 1:40 to 1:500, the extractability of Fe oxides would be negatively affected by the presence of active Al, including allophane/imogolite, amorphous Al, and Al-humus complexes. Because these Al constituents are abundant in Andisols, they would be at least partially responsible for the lower extractability of Fe oxides by HH_<mBCR> from Andisols.
- 2012-12-00
著者
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Makino Tomoyuki
National Inst. Agro‐environmental Sci. Tsukuba Jpn
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SUDA Aomi
JSPS:Graduate School of Life and Environmental Sciences, University of Tsukuba
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Higashi Teruo
Graduate School of Life and Environmental Science, University of Tsukuba
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