木節粘土腐植の分別抽出

概要

論文の詳細を見る
Motoyama-, Hara-, and Iga-kibushi clays were subjected to fractional extraction by using NaOH and Na_4P_2O_7 to characterize the humic substance involved in the clay. Cation exchange capacity (CEC) was also measured for the untreated and H_2O_2-treated clays. Followings were verified : 1) The humic substance involved in Motoyama- and Hara-kibushi was mainly composed of a humin-type, which was hardly extracted with NaOH and Na_4P_2O_7,while the humic substance was extracted readily from Iga-kibushi. 2) The humic substance extracted was considered to be bound with clay via Al-ions. 3) While CEC was larger for untreated clay than for H_2O_2-treated one in an alkali region, there was not .much difference in CEC between both treatments in the neutral and acidic regions except Iga-kibushi. The contribution of the humic substance to the negative charge of the clay surface was discussed on the basis of the CEC mesured.
日本粘土学会の論文
1990-08-10