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It is pointed out that dissolved silicate is an essential matter for diatom and an important factor affecting ecosystems in estuaries. We made field measurements and analyses for water quality and material flow, especially dissolved silicate in the Yodo River Basin with sewerage systems and waterworks systems. Dissolved silicate concentration in Uji River is about 1 to 2 mg/L, and the spring-blooming in Lake Biwa causes a significant decrease in the concentration. The dissolved silicate concentration in water and sewage plants is hardly changing in the treating process. Moreover, underground water pumped up for tap water contains rich dissolved silicate, and is greatest source of dissolved silicate in the basin.

DISSOLVED SILICATE TRANSPORT IN COMPLEX FLOW SYSTEM IN YODO IVER BASIN