文章基本信息

标题：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
本地全文：下载
作者：小野寺祐夫 ; 田畑真佐子 ; 石倉俊治等
期刊名称：Journal of Health Science
印刷版ISSN：1344-9702
电子版ISSN：1347-5207
出版年度：1980
卷号：26
期号：1
页码：34-40
DOI：10.1248/jhs1956.26.34
出版社：The Pharmaceutical Society of Japan
摘要：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 SO₄^2- was less than 10 ppm.
关键词：hypochlorite;chloramine;dissolved oxygen;ferrous ion;chemical species of iron compounds presented in the water;corrosion of soft iron material;rate of disappearance of residual chlorine