土壌型と腐植の形態との関係に関する研究(第6報) : 氷醋酸・無水醋酸・硫酸法 (Sulfacetolyseverfahren) について

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SPRINGER used in his earlier work acetyl bromide for separating true humic substnance from soil organic matter, but recently he proposed the use of mixed solution of acetic anhydride, glacial acetic acid and conc. sulphuric acid (Sulfacetolyseverfahren) instead of acetyl bromide. By the use of this solution we divided true humic substance into true humic acid and humin. 1) As the content of true humic acid did not differ significantly, we omitted the pretreatment of soils with acid. (See Table l) 2) Of upland soils, podsol had true humic acid very little; particularly, its A_0 horizon, which had a mor form. Degree of decomposition (Zersetzungsgrad) was beneath 20 in both horizons, B_1 and B_2; and humin was also very little. When we divided brown forest soils into two kinds, volcanic and non-volcanic, we could find great difference in the nature of the humus of the two. In the former, humus was accumulated; and the more the humus was, the larger the percentage of true humic acid was, we supposed, the humus in this accumulation was in the form of aluminate of true humic acid. The latter contained small amount of humus and its percentage of true humic acid was small. (See Table 2 and 3) 3) The amount of true humic acid in humic acid, extracted from soils by cold 0.5% NaOH, increased with the progress of humification. (See Table 5)
社団法人日本土壌肥料学会の論文
1956-01-05