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首页> 外文期刊>Soil Science and Plant Nutrition >Extractability of manganese and iron oxides in typical Japanese soils by 0.5 mol L-1 hydroxylamine hydrochloride (pH 1.5).
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Extractability of manganese and iron oxides in typical Japanese soils by 0.5 mol L-1 hydroxylamine hydrochloride (pH 1.5).

机译：0.5 mol L -1 羟胺盐酸盐（pH 1.5）在典型日本土壤中的锰和铁氧化物的萃取能力。

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摘要

We investigated the extractability of manganese (Mn) and iron (Fe) oxides from typical Japanese soils (Entisols, Inceptisols, and Andisols) by 0.5 mol L-1 hydroxylamine hydrochloride (NH2OH-HCl) extraction (pH 1.5; 16 h shaking at 25 degrees C; soil:solution ratio 1:40), referred as to HHmBCR, which is Step 2 (used for the reducible fraction) of the modified BCR (Community Bureau of Reference) sequential extraction procedure. The HHmBCR 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 HHmBCR 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 HHmBCR from Andisols.
机译：我们调查了0.5 mol L -1 羟胺盐酸盐（NH 2 OH-HCl）萃取（pH 1.5;在25摄氏度下振摇16 h;土壤：溶液比1:40），称为HH mBCR ，它是步骤2（用于还原分数）的修改后的BCR（社区参考局）顺序提取程序。 HH mBCR 方法从非Andisol样品中提取了几乎所有Mn氧化物，但未能从Andisol的一些样品中提取了一部分Mn氧化物。该方法从非Andisol样品中提取了大多数短程有序的Fe氧化物，但分别从同色和非卤代Andisol样品中仅提取了7.5％和13％的短程有序Fe氧化物。 Fe氧化物的这种极低的可萃取性表明，HH mBCR 方法不适用于从Andisols中萃取氧化物吸附的重金属。由于使用萃取剂从各种土壤中萃取短程有序Fe氧化物的速率与草酸盐和焦磷酸盐可萃取的Al的含量呈负相关，即使通过将土壤与溶液的比例从1增加到降低萃取pH的可变性时也是如此。从1:40到1：500，Fe氧化物的可萃取性将受到活性Al的存在的不利影响，包括Allophane / imogolite，无定形Al和Al-humus络合物。由于这些铝成分在Andisols中含量较高，因此至少部分原因是HH mBCR 从Andisols中提取铁氧化物的能力较低。

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