海水中におけるモノクロラミンの減衰と残留する酸化性物質の存在

概要

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Monochloramine (NH2Cl) is the strongest toxic substance resulting from chlorinated sewage effluent. To estimate of NH2Cl on the growth of organisms in coastal region, disappearance of NH2Cl in seawater was investigated.Changes concentration of NH2Cl and total oxidant in artificial seawater were determined. The concentration of NH2Cl decreased with time and reached to 20% of the initial concentration after 6 hour at 30°C. On the other hand, 90% of the initial concentration of total oxidant was detected after disappearance of NH2Cl. The rate constant of NH2Cl disappearance was not concerned in the initial concentration at constant temperature. Disappearance of NH2Cl depended on water temperature, and the rate constant followed the Arrhenius equation. The rate constant and half-life value at 20°C for NH2Cl in seawater were 0.031 h-1 and 10 h. These results suggested that the effluent contained NH2Cl would be enough to effect on coastal organism until its disappearance. NH2Cl disappearance depended on salinity. However, NH2Cl in artificial seawater without KBr was stable even in the same condition. It was clear that the disappearance factor of NH2Cl was in existence of Br-. NH2Cl changed to the other oxidant with Br-, therefore, the product which may act on organisms still remained in seawater after disappearance of NH2Cl.
1996-05-10