東北海道に分布する火山灰土壌の微量要素

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Volcanic ash soils are widely distributed in large parts of eastern Hokkaido. However, little attention has been paid to the subject of trace elements of these soils. This study was carried out to elucidate the distribution and behaviour of trace elements which accompany the soil formation process. For this purpose, 67 samples from 12 virgin soils were examined by the general methods for the analysis of trace elements. The chemical analyses used here were Na_2 CO_3 fusion and HCIO_4 digestion methods for the total trace element contents, and "H_2O_2-TAMM's reagent-Mg reduction" in successive treatments for trace elements such as Mn, Zn, Cu, Co and Mo. Quantitative determination of trace elements was by means of atomic absorption spectrophotometry and colorimetry. The results obtained are summarized as follows : 1) The total trace element contents ranged from 695 to 3, 549ppm, 48 to 224ppm, 8 to 93ppm, 2.9 to 46.6ppm and 0.39 to 3.38ppm in Mn, Zn, Cu, Co and Mo respectively. Further the total Mn and Co content increased in the buried volcanic ash soils in proportion to depth. The soil samples from the top "A" and buried "A" horizons showed high contents of total Zn and Cu, in particular, total Zn increased in the buried volcanic ash soils in proportion to depth. By contrast, total Cu did not show any such tendency. Of all trace elements studied, total Mo varied the least within the soil profile. 2) Total Fe was used to compare the behaviour of each of the trace elements within the soil profile. The correlation of the total content of each trace element to that of Fe differed. No differences were observed among the "A" horizons and "(B)-C" horizons with respect to Zn and Co, while on the other hand, there was a distinct difference between the "A" horizons and "(B)-C" horizons with respect to Cu. 3) As a result of successive treatments for Mn, Zn, Cu and Co, the percentage of the total soluble parts within the total content of Mn, Zn, Cu and Co, ranged from 9 to 92%, 18 to 47%, 4 to 70% and 9 to 70%, respectively. With reference to the distribution of total soluble parts of successive treatments within the soil profile, it was found that Mn and Co increased, while Zn and Cu decreased in the buried volcanic ash soils. The comparative concentrations of trace elements for each treatment, were as follows : [chemical formula] In general, the behaviour of Cu in the soil profile was accompanied by the formation of amorphous SiO_2 -A1_2O_3 gels. Zn and Co were, by contrast, accompanied by the formation of free Fe oxides.
帯広畜産大学の論文
1975-10-10

東北海道に分布する火山灰土壌の微量要素

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