17 0 0 0 OA 煮沸による高度浄水処理水のトリハロメタンおよび全有機ハロゲン (TOX) 濃度の変化
- 著者
- 山本 耕司 角谷 直哉 山本 敦史 鶴保 謙四郎 森 義明
- 出版者
- Japan Society for Environmental Chemistry
- 雑誌
- 環境化学 (ISSN:09172408)
- 巻号頁・発行日
- vol.15, no.1, pp.137-144, 2005-03-25 (Released:2010-05-31)
- 参考文献数
- 25
- 被引用文献数
- 5 6
大阪市では2000年3月から全域で高度浄水処理水が給水されている。高度処理水をやかん, 電気ポットで加熱, 沸騰させたときのトリハロメタン, 全有機ハロゲン (TOX) の減少経過について検討した。トリハロメタンについては, これまでの水道水にみられた沸騰直前の急激な濃度上昇は見られず, 加熱に伴って減少し, 煮沸1分で消失した。蛇口水でのTOXに占めるTHMの割合は32%であった。TOXの加熱・煮沸に伴う減少経過から, TOXは揮発性と不揮発性のハロゲン化合物から構成されていた。高度処理水のTOXはやかんで沸騰時に17%, 電気ポットで40%しか減少されなかった。
2 0 0 0 OA アスベスト問題の現状と課題
- 著者
- 船坂 邦弘 鶴保 謙四郎 森 義明
- 出版者
- (社)大阪生活衛生協会
- 雑誌
- 生活衛生 (ISSN:05824176)
- 巻号頁・発行日
- vol.50, no.5, pp.333-337, 2006 (Released:2006-10-19)
- 参考文献数
- 8
- 被引用文献数
- 2
In June 2005, media coverage of the health effects of asbestos used at factories on nearby residents developed into an “asbestos panic” in Japan. Asbestos is a natural mineral fiber and is widely used as a material for industrial and construction purposes because of its significant tensile strength, heat resistance and thermal insulating properties. Japan′s Ministry of Health, Labor and Welfare has proposed a new regulation for the prevention of asbestos scattering due to building demolition. Here, we provide a brief overview of asbestos from the viewpoints of present and future problems.
- 著者
- 山本 耕司 鶴保 謙四郎 細川 守 山本 攻
- 出版者
- 公益社団法人 日本薬学会
- 雑誌
- 衛生化学 (ISSN:0013273X)
- 巻号頁・発行日
- vol.27, no.5, pp.278-284, 1981-10-31 (Released:2008-05-30)
- 参考文献数
- 10
- 被引用文献数
- 1
In order to elucidate the effect of fiber reinforced plastics (FRP) for water works on the water quality, the time course of elution of organic matters from FRP test pieces was investigated and the free available chlorine consumption by test pieces was also studied. Total organic carbon (TOC) of the water, in which test pieces were immersed, was regarded as the amount of organic matters eluted from test pieces to water. The amount eluted to distilled water was propotional to the surface area of test pieces, and entirely dependent on the water temperature. The similar tendency was observed in the amount of styrene contained in the eluted organic matters. Gel filtration of the eluate showed that the organic matter contained high molecular weight substances. The organic matter was also eluted from the test pieces which had been washed with tap water during 12 months. The chlorine had no effect on the elution profile of organic matters from test pieces. The time course of elution of styrene, however, showed a time lag in the presence of chlorine. The styrene reacted with the chlorine in water and the product was 1-phenyl-2-chloroethanol. The chlorine consumption by test pieces, however, was not able to be estimated by the amount of eluted styrene. A linear relationship existed between the decrease of chlorine and the square root of time. Its slope was propotional to the initial concentration of chlorine and the surface area of test pieces. The chlorine consumption by test pieces could be explained by the assumption that the diffusion of chlorine into the interface between test pieces and water was the rate-determining step.
