Hygienic Chemical Studies of Water Supply : Disappearance of Residual Chlorine and Presence of Ferrous Compounds in the Water during Contact with Model Iron Material
Year: 1980
Type: article
Abstract: 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 Fe2+ from iron pieces into the water was accelerated by residual chlorine suddenly followed by oxidation of Fe2+ to Fe3+ precipitate. After disappearance of free Cl, however, presence of Fe2+ 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 1.5×10-2M/dm2 (Fe)/min, respectively, when the concentration of these substances and SO42- was less than 10 ppm.
Source: Eisei kagaku
Authors: SUKEO ONODERA, MASAKO TABATA, SHUNJI ISHIKURA
Language: English
Subfield: Health, Toxicology and Mutagenesis
Field: Environmental Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4240643113