水道水の衛生化学的研究 : モデル鉄材との接触過程でおこる残留塩素の消失および第一鉄の残留

概要

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Changes in th quality of domestic tap water during contact with model iron materials were investigated by chemical and instrumental analyses. When neutral chlorinated water was placed in contact with pure iron pieces at 20°, the concentration of residual chlorine (free and combined) and solved oxygen in the water decreased rapidly with time, and pH of the water was lowered in the presence of free chlorine, but rose in the presence of combined chlorine. Dissolution of Fe^<2+> from iron pieces into the water was accelerated by residual chlorine suddenly followed by oxidation of Fe^<2+> to Fe^<3+> precipitate. After disappearance of free Cl, however, presence of Fe^<2+> compounds in the water was found in a higher concentration. The rate of disappearance of free Cl, combined Cl, and dissolved oxygen in the water showed a linear relation with logarithm of each concentration. Rate constants for the disappearance of free Cl, combined Cl, and dissolved oxygen in the neutral water at 20° were about 3.2×10^<-2>, 2.7×10^<-2>, and 1.5×10^<-2>M/dm^2 (Fe)/min, respectively, when the concentration of these substances and SO_4^<2-> was less than 10 ppm.
社団法人日本薬学会の論文
1980-02-29