1.製糸用湯中の鉄イオンを封鎖するにあたって, EDTA2Na塩を使用し, 共存する硬度成分に関係なくpH6～7において鉄イオン5～15ppmに対しEDTA量として40～120ppmで安全にその活性を封鎖出来ることを知った (この場合鉄イオンの量とEDTA量には等モル関係が成立している)。
2.上記結果の妥当性を確認するためEDTA-金属の安定度定数より検討した結果, 鉄-EDTA錯塩はpH6～7において何れもlog値で8以上であり当然EDTAと金属が等モルで化学量論的に反応する領域にあり, またCaはlog値で8以下でFeとCaとの開きはlog値で3であり硬度成分たるCaはEDTAによるFeの捕捉には問題にならないことがわかり, えられた結果の理論的根拠を明らかにしえた。

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This paper reports the pattern of acid excretion in patients on chronic hemodialysis and with renal tubular acidosis examined by the method for qualitative and quantitative analysis of urinary acids which was reported in a previous paper. The specimens were early-morning urine and the titration curve with alkali was drawn by the automatic recording titrator. (1) Chronic hemodialysis cases In 10 cases, there were 1 of JJJ-type, 6 of JJ-type and 3 of J-type. Every case showed an abnorml type of titration curve, i. e. A(±) or A(-) type. Especially in the A(-) type, H₂PO₄-showed a pH-jump, i. e. the type was J-P. There was no significant relation between the type and the duration of dialysis. Urine pH was high, except in 1, with a mean of 7.00. This is presumably due to the excretion of HC0₃- caused by an increase of its concentration in the blood by importation from dialysate. TA and NH₄.+ concentrations were markedly reduced. In 5 cases examined for HCO₃-excretion, it was found in every case. (2) Cases of renal tubular acidosis In all the 3 cases studied, the titration curve was of JJ-P⋅AB type, but the proximal RTA case represented JJJ-type in an advanced stage. Urine pH was over 6.00 in spite of the presence of metabolic acidosis, with a mean of 6. 79, TA concentration was reduced in every case. NH₄+ concentration was reduced in two cases with distal RTA, but within the normal range in the case with proximal RTA. HC0₃- was detected in every case. But in an advanced stage of acidosis in the proximal RTA case, TA and NH₄⁺ concencentions markedly increased and HC0₃- disappeared. The causes of this are discussed.

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A study on the fixation character of various cations adsorbed on kaolin minerals due to drying have been carried out. Kibushi clay, Gaerome clay, both are widely used in ceramic industry in Japan, and Zettlitz kaolin were selected as samples.
The obtained results are summerized as follows:
(1) The fresh raw undried Kibushi and Gaerome clays, fixed the exchangeable cations (Na⁺, K⁺, Ca⁺⁺, Mg⁺⁺) increasingly with drying temperature up to 50-500°C.
(2) Various monoionic clays prepared by leaching with chloride solutions fixed the cations increasingly with drying temperature up to 200-300°C. The order of the fixation tendency was Li⁺>Na⁺>K⁺.
(3) Polyvalent cations (Th⁺⁺⁺⁺, Ca⁺⁺) adsorbed on Zettlitz kaolin were found to be fixed intensively on drying at the temperature up to 300-500°C.

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