Occurrence of 1,4-Dioxane Contamination in the Water Source and the Yodo River Zone in Osaka Prefecture, Japan

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Levels of 1, 4-dioxane in raw and tap water at 15 water purification plants in Osaka prefecture, Japan, and in the Yodo River Zone were investigated. The 1, 4-dioxane levels in samples at 14 of the water purification plants ranged from <0.05 to 1.8 μg/l. These values are much lower in concentration than the 50 μg/l water quality standard for drinking water in Japan. However, over 50 μg/l of 1, 4-dioxane was detected in raw and tap water collected at one of the water purification plants surveyed. The groundwater in this water purification plant was determined to be contaminated by 1, 4-dioxane. The removal ratio of 1, 4-dioxane by water treatment was found to be inefficient, even with advanced water treatment methods. The levels of 1, 4-dioxane in the Yodo River, the main water source in the Osaka area, ranged from 0.08 to 0.91μg/l well within the acceptable level.
日本環境化学会の論文