<報文>水道水中の低級ハロゲン化炭化水素の生成

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The aim in this study was to find the precursor for low halogenated hydrocarbon contaminated in the tap water from the point of reaction chemistry. When a 100ppb solution containing any of these organic compounds (ethanol, acetoaldehyde, acetone, dimedone, 5-methylfurfural, acetophenone, hydroquinone, resorcinol, catecoal, pyrogallol, frorogurcinol and humic acid) was allowed to react with the 10ppm chlorine water at 25℃ and pH=7.0, trichloromethane was undoubtedly formed from the acctone, dimedone, 5-methylfurfural, resorcinol and humic aeid. When acetone or acetophenone was reactant, it seemed that the typc of the trichloromethane reaction at pH=7 reprcsented seccesivefirst order kinetics. Next, three reaction experiments detcrmining whether CHCl₃ and CHCl₂Br could be formed or not were conducted by using the test waters which was made from raw water removing humic acid by the pretreatmcnts. In the casc of the test water that was eluated through anion exchange resin (IRA-402), CHCl₃ and CHCl₂Br were not detected. But, in the other test waters, CHCl₃ and CHCl₂Br were formed, the amounts of CHCl₃ and CHCl₂Br which were produced in both the test waters, One filtered with No. 6 filter paper and the other filtered with the same paper after precipitation treatment at pH=1, were less than those of raw water, The normal concentration of acetone, 5-methylfurfural, and acetophenone in raw water was extremely less than 100ppb used in this experiment. So, it would not seem that these compounds are the precursor for low halogenated hydrocarbon in tap water. On other hand, humic acid is considered to be a brccursor, because ofthe experimental facts (1) that the low halogenated hydrocarbons were formed from humic acid (2) that the low halogenated hydrocarbons were not detected in the effluent through the anion exchange resin and (3) that this concentration of humic acid was thought to be present in raw water. The low brominated hydrocarbon in tap water would be formed in the following ways: The concentration of Brˉ was about 80ppb. The Brˉ is changed to Br₂ with the addition of Cl₂. The low hrominated hydrocarbons were formed by the reaction between precursor and Br₂ like as Cl₂.
横浜国立大学の論文

<報文>水道水中の低級ハロゲン化炭化水素の生成

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