巻号一覧
24 巻, 7 号
選択された号の論文の6件中1～6を表示しています
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原著論文
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陣矢 大助, 門上 希和夫, 岩村 幸美, 濱田 建一郎, 山田 真知子, 柳 哲雄2001 年 24 巻 7 号 p. 441-446
発行日: 2001/07/10
公開日: 2007/02/22
ジャーナル フリーThree detailed surveys on chemical substances in water columns of Dokai Bay in Kitakyushu, Japan, were carried out to know actual states of their distributions and behavior in the bay. Sixteen chemicals, such as chlorobenzenes, chlorophenols and anilines, were widely detected in surface water and nine polycyclic aromatic hydrocarbons (PAHs) were detected in bottom water around center of the bay. Horizontal and vertical distributions of chlorobenzens, chlorophenols and anilines were consistent with the residual current of seawater. By comparing the decrease of their concentrations to salinity, it was elucidated that chlorobenzenes and chlorophenols were declined by volatilization and photolysis respectively, and anilines were declined by biodegradation and photolysis. On the other hand, it was strongly suggested that PAHs which adsorbed to suspended particles were swiftly settled to bottom sediment near their source with the influence of residual current.抄録全体を表示PDF形式でダウンロード (742K) -
井関 直政, 益永 茂樹, 中西 準子2001 年 24 巻 7 号 p. 447-453
発行日: 2001/07/10
公開日: 2007/02/22
ジャーナル フリーPolychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs) and coplanar PCBs (Co-PCBs) concentrations in cormorant eggs collected from two colonies in Japan were compared. Among PCDD/Fs, the 2,3,7,8-substituted congeners dominated approximately about 90% of the total concentrations in both colonies. Concentrations of PCDD/Fs found in eggs collected from Tokyo area (average concentration=1900pg·g-1 fat) were significantly greater than the eggs from Aomori (1000pg·g-1 fat). PCDFs were found at higher level in eggs from Tokyo. In addition, Co-PCBs in egg from Tokyo were also higher (9300ng·g-1 fat) than in eggs from Aomori (2800ng·g-1 fat). Besides, toxic equivalents (TEQ) of PCDD/Fs and Co-PCBs in eggs were higher by 2.1 fold at Tokyo (3600pgTEQ·g-1 fat) than Aomori (1700pgTEQ·g-1 fat). The main contributors to the toxicity were 1,2,3,7,8-PeCDD (8, 15%), 2,3,4,7,8-PeCDF (14, 11%), CB81 (15, 11%), CB77 (17, 14%), CB126 (36, 39%) in both locations (Tokyo and Aomori), respectively.抄録全体を表示PDF形式でダウンロード (860K) -
Dadang Suhendar, 川西 琢也, 清水 宣明, 林 良茂2001 年 24 巻 7 号 p. 454-458
発行日: 2001/07/10
公開日: 2007/02/22
ジャーナル フリーAn autotrophic continuous denitrification process, using hydrogen generated by electrolysis with activated carbon anodes, were experimentally demonstrated to be an effective nitrate removal process. Several fixed bed columns with polypropylene packing and honey-come shaped activated carbon anodes and stainless rod cathodes were set in thermostat chamber of 30°C, and then potassium nitrate enriched tap water, nitrogen concentration of 30mg-N·l-1, was supplied at various flow rates and electric currents. Although the anode is in the same column where microbes grow, sufficient nitrate removal was observed. For example, 94% of nitrate was removed at the HRT of as short as 1.8h for an electrical current of 6mA. A model assuming successive nitrate and nitrite reductions and plug-flow process, nitrate reduction rate=k1[NO3-][H2], and nitrite reduction rate=k2[NO2-][H2]1.5 was constructed. Calculated results with k1=1.3l·mmol-1·h-1 and k2=3.3l1.5·mmol-1.5·h-1 agreed well with the all the experimental results.抄録全体を表示PDF形式でダウンロード (692K) -
鄒 国燕, 宋 祥甫, Weiming WU, 西崎 日佐夫, 羅 栄, 村本 茂樹, 青山 勲2001 年 24 巻 7 号 p. 459-465
発行日: 2001/07/10
公開日: 2007/02/22
ジャーナル フリーRapid modernization is proceeding and water pollution by detergents, agricultural chemicals, heavy metals and other toxic chemicals is now on problem with magnification of human activities in China. In this paper, the effect of cadmium on rice growth, bioaccumulation of cadmium to each part of rice, removal rate of cadmium from water and safety of food were investigated. Rice was grown from young plant to harvesting stage in vinyl house and exposed to cadmium for 80 days.
The rice grew normally at the concentration range from 0.001 to 0.1mgCd·l-1, however, the growth of rice was extremely inhibited at the concentration of 100mg Cd·l-1. The Cd concentration of each part of rice was in the order of root>stem>leave>stalk>grain>brown rice. In the first 40 days of the treatment, the accumulation rate of each part of rice reached to 70-94% for the final accumulation at the harvesting time. It was found that the Cd concentration in water satisfying the safety standard is below 0.029mgCd·l-1, when Cd concentration in brown rice is 0.4mgCd·kg-1.抄録全体を表示PDF形式でダウンロード (873K) -
芦田 賢一, 山本 淳, 古武家 善成2001 年 24 巻 7 号 p. 466-472
発行日: 2001/07/10
公開日: 2007/02/22
ジャーナル フリーSpatial and temporal distributions of arsenic and other heavy metals in river waters, river sediments and spring waters were investigated in the Ina River System flowing in the east area of Hyogo Prefecture during 1996-99. Arsenic showed the highest concentration at the water quality monitoring point of Gin-bashi, located in middle reaches, among the sampling points in the main stream. The concentration was found to be influenced from three tributaries, Nojiri River, Shio River and Yato River, and several springs containing arsenic in the order of 10-100μg·l-1. Other heavy metal concentrations in river waters did not differ from average in this prefecture. Dissolved As3+ was found as major arsenic component in most of the springs. In main stream, arsenic in river sediments also indicated similar distribution pattern as the pattern in river waters.
From these results and long-term monitoring data of arsenic, it is presumed that the distributions of arsenic in river waters and sediments are influenced basically by geological features, and temporarily by Hyogo-ken Nanbu Earthquake and Inagawa Earthquake Swarm.抄録全体を表示PDF形式でダウンロード (942K)
ノート
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花木 啓祐, 中村 剛雄, 松尾 友矩, 糸川 浩紀2001 年 24 巻 7 号 p. 473-476
発行日: 2001/07/10
公開日: 2007/02/22
ジャーナル フリーAbrupt emission of nitrous oxide was observed in denitrification step of circulated nitrogen removal process treating domestic wastewater from combined sewerage system. Continuous monitoring of nitrous oxide emission revealed that such abrupt nitrous oxide emission occurred only when redox potential (ORP) exceeded+300mV. Dilution of influent by rain or snow was suspected reason for this emission, but rain or snow did not always resulted in such event. Laboratory scale experiments demonstrated the emission of nitrous oxide and accumulation of nitrate with intentional shock feeding of diluted influent. Addition of acetate after the feeding of diluted influent helped quick process recovery to the normal denitrification.抄録全体を表示PDF形式でダウンロード (641K)
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