徳山　和秀・迫　昭男・赤崎　いずみ・冨山　典孝・関屋　幸一・青山　好文

The Pattern of Dioxins Isomers and Homologue in Environmental River Water

Kazuhide TOKUYAMA, Akio SAKO, Izumi AKAZAKI, Noritaka TOMIYAMA, Koichi SEKIYA and Yoshifumi AOYAMA

Abstract
We have evaluated the concentration of tetra- through octa- chlorodibenzo-p-dioxins (PCDDs), tetra- through octa- chlorodibenzofurans (PCDFs) and coplanar polychlorobiphenyls (Co-PCBs) in environmental river water in Miyazaki prefecture since 2002, and analyzed the data of homologue/isomer pattern in 2002 and 2003.

As a result, dioxin pollution in environmental river water seemed to be caused by agricultural chemicals, combustion and PCB products.

PCDDs occupied a large amount of dioxin concentration in river water. While dioxin concentration in river water contained a low percentage of PCDFs and Co-PCBs.

A source of PCDDs pollution seemed to be agricultural chemicals, that of PCDFs seemed to be combustion and PCB products from each proportion of homologue. A pollution source of Co-PCBs seemed to be PCB products from isomer pattern.

Key words : PCDDs, PCDFs, Co-PCBs, homologue/isomer pattern, dioxin pollution

はじめに
当所では、平成14年度に特殊化学物質分析施設が増設され、環境中及び発生源のダイオキシン類分析を行っている。平成14年度及び15年度に行政依頼検査として県内の環境河川水中のダイオキシン類を36検体分析した。これらのデータを用い、ダイオキシン類実測濃度の同族体・異性体構成比率等について概要をまとめたので報告する。