巻号一覧
35 巻 (2001)
- 4 号 p. 151-
- 3 号 p. 107-
- 2 号 p. 61-
- 1 号 p. 1-
35 巻, 4 号
選択された号の論文の5件中1～5を表示しています
- |<
- <
- 1
- >
- >|
追悼
-
一國 雅巳2001 年 35 巻 4 号 p. i-iii
発行日: 2001/12/20
公開日: 2017/01/07
ジャーナル フリーPDF形式でダウンロード (595K)
報文
-
服部 裕史, 中口 譲, 近藤 祐一郎, 高田 正貴, 平木 敬三2001 年 35 巻 4 号 p. 151-158
発行日: 2001/12/20
公開日: 2017/01/07
ジャーナル フリーThe vertical profiles of dissolved selenium species; selenite (Se (IV)), selenate (Se (VI)), and organic selenide, at 4 stations in the Japan Sea were determined with a high performance liquid chromatography (HLPC)-2,3-dimaninonaphtalene (DAN) fluorometric method. In the surface water, Se (IV) concentration was 0.075±0.021 nM, and it was a little higher than the subsurface water. Se (VI) concentration was also higher in the surface. The significant variations of dissolved oxygen profiles were observed at 600〜2,500 m (the Japan Sea Deep Water: JSDW). Se (IV) increased with depth in JSDW, and Se (VI) maximum was observed at a depth of 800 m at CM 10, CM 18 and CM 12 and 1,250 m at CM 20. Organic selenide existed in the surface water, the JSDW and Japan Sea Bottom Water (JSBW) with concentrations of 0.2〜0.5 nM. The production rate of selenium was estimated from the ventilation time of JSDW and JSBW using apparent oxygen utilization (A.O.U.). Se (IV) supplied from surface to subsurface was 5.16 pM yr-1, and organic selenide regenerated from particle matter was 12.9 pM yr-1. The fluxes of Se (IV) and organic selenide into JSDW were 0.65 and 2.83 pM yr-1, and those into JSBW were 0.98 and 0.05 pM yr-1, respectively. The rate constant for the oxidation of Se (IV) to Se (VI) in JSBW was estimated to be 1.7×1O^-3yr-1. Tne mean life of Se (IV) in JSBW was estimated to be 178 years.抄録全体を表示PDF形式でダウンロード (804K) -
益永 茂樹, 姚 元, 高田 秀重, 桜井 健郎, 中西 準子2001 年 35 巻 4 号 p. 159-168
発行日: 2001/12/20
公開日: 2017/01/07
ジャーナル フリーOn the basis of the congener-specific analysis of dioxins in a dated sediment core, surface sediment, and soil samples, the sources and mass balance of dioxins in Tokyo Bay basin, Japan, were estimated. The dioxins in the sediment core showed that their deposition in the bay increased rapidly during the 1960s, peaked in the early 1970s and then decreased gradually. Principal component analysis of the congener-specific data showed that three major sources existed: combustion, pentachlorophenol (PCP), and chloronitrophen (CNP). PCP and CNP are paddy field herbicides used extensively in Japan in the past. The time trends of source contributions were estimated by multiple regression analysis using the source congener profiles. The results revealed that dioxin emission from PCP and CNP herbicides was high in the 1960s and the early 1970s, respectively. The total contribution in terms of TEQ from the two herbicides was at their maximum of 70% in the 1970s and decreased thereafter. Their contribution, however, was as high as 50% in recent sediment, indicating that dioxins sprayed as herbicide impurity were still remaining in terrestrial soil and river sediment of the basin and running off gradually.抄録全体を表示PDF形式でダウンロード (1017K) -
田中 伸幸, 河村 公隆2001 年 35 巻 4 号 p. 169-182
発行日: 2001/12/20
公開日: 2017/01/07
ジャーナル フリーTo better understand the wet scavenging processes of organic aerosols from the atmosphere, aerosol and rain samples were simultaneously collected in suburban Tokyo and analyzed for neutral lipid components using a capillary gas chromatography (GC) and GC/mass spectrometry. n-Alkanes, unresolved complex mixture of hydrocarbons (UCM), polycyclic aromatic hydrocarbons (PAHs), n-alcohols and sterols were determined in both aerosol and rainwater samples. Concentrations of n-alkanes, UCM and PAHs that originate from terrestrial higher plants or anthropogenic sources, were found to decrease with time during precipitation in both rain and aerosols. In contrast, concentrations of n-alcohols (<C20) and cholesterol that are characteristic to marine organisms generally increased during precipitation events. This study demonstrates that composition and concentrations of organic compounds in rain and aerosol samples during wet precipitation can be controlled not only by the scavenging process but also by a likely inflow of air mass of marine origin.抄録全体を表示PDF形式でダウンロード (1234K)
博士論文抄録
-
谷本 浩志2001 年 35 巻 4 号 p. 183-
発行日: 2001/12/20
公開日: 2017/01/07
ジャーナル フリーPDF形式でダウンロード (188K)
- |<
- <
- 1
- >
- >|