Abstract
Concentrations for polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/PCDFs), and Co-PCBs in river waters and sediments of Kanzaki rivers, in which environmental standards of water and sediment were exceeded, were investigated. Distributions of dioxin concentrations and variations of constituents from upstream to downstream were showed. In sampling point 3, dioxin concentration of water and sediment were high, it is showed that dioxin in sediment were raised up to water layer and then water concentration increased.
Dioxin concentrations in river waters were highest in middle area of Kanzaki river and these concentration became decreased and stable as descending to downstream of the river.
Dioxin concentration constituents in suspended at river waters in middle area of Kanzaki river (around point 3) were beyond 90 % and those in soluble of low chlorinated PCDD/PCDFs and Co-PCBs were about 20 %.
Co-PCBs concentrations in sediment of downstream were higher than those of middle stream by 10 times. Dioxin concentrations in sediment were higher, where ignition loss, water content, and sulfide concentration were higher.
