土壌及び底質中の塩素化ダイオキシン類とその類似化合物の抽出及び濃縮方法と汚染源の同定に関する研究(博士論文要録)
スポンサーリンク
概要
- 論文の詳細を見る
Source identification of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDDs/PCDFs), as well as coplanar polychlorinated biphenyls (Co-PCBs) in soil and sediment samples is an essential factor to reduce those compounds released into the environment and to reduce the risk to human health and survival. However, chemical analyses of these compounds in environmental samples are ultra-trace-level analyses that required much time and labor. In this study, effective extraction and concentration methods for PCDDs/PCDFs and Co-PCBs analyses were studied, and the concentrations and sources of those compounds in paddy soil and sediment samples from major river basins in Akita were systematically investigated. Optimization studies of extraction solvents for pressurized liquid extraction (PLE), and nitrogen gas-flow rates and concentration solvents for the final concentration were performed. The proposed methods were successfully applied to analyzing the target compounds in real samples. The target compounds were ubiquitous in paddy soil and sediment in river basins, but the concentrations in those samples were much lower than that in the environmental standards. In addition, the concentrations of Co-PCBs were lower than that of PCDDs/PCDFs. Furthermore, the results obtained from homologue and isomer compositions have demonstrated that PCDDs/PCDFs originating from impurities in herbicides and atmospheric depositions could be extremely important sources of the compounds in paddy soil and sediment in Akita.
- 2007-01-05