Journal of Ecotechnology Research
Online ISSN : 1884-0388
Print ISSN : 1881-9982
ISSN-L : 1881-9982
Volume 11, Issue 3
Displaying 1-7 of 7 articles from this issue
Original Article
  • Yasunobu IWASAKA
    2005 Volume 11 Issue 3 Pages 101-104
    Published: 2005
    Released on J-STAGE: March 11, 2015
    JOURNAL FREE ACCESS
    Recently Japan Meteorological Agency stated KOSA forecasting following China and Korea. This suggested that research of KOSA, especially research on long-range transport of KOSA, came to a kind of summit and new era also started. Microphysics of KOSA particles and their effects on climate and environment will be an important issue in future since it is hardly possible to assess those processes completely and those processes link to various research fields in addition to meteorology and climate. The importance of KOSA transformation was strongly suggested by the field measurements made in Japan and China in 2000-2003: reactions including atmospheric sulfur on the KOSA particle surface, phase transformation of KOSA particles, shape change of KOSA particles.
    It will be important to use and apply the information given by the KOSA forecasting to academic fields and our social activities in future.
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  • Masamoto TAFU, Tetsuji CHOHJI
    2005 Volume 11 Issue 3 Pages 105-109
    Published: 2005
    Released on J-STAGE: March 11, 2015
    JOURNAL FREE ACCESS
    In arid areas, a water resource is one of the most serious environmental issues. For examples, in some part of northern China, many serious health diseases caused by ground water polluted with fluoride have been reported. We have developed new technologies based on material science for treatment of fluoride-polluted water. In this review, we reported some results of our studies about 1) a novel water treatment process using activated alumina, 2) a unique “biomimetic nano-surface reaction” of calcium phosphate and fluoride in water, and 3) material design for water treatment.
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  • Kazutoshi TANABE, Norihito OHMORI, Shuichiro ONO, Takatoshi MATSUMOTO, ...
    2005 Volume 11 Issue 3 Pages 111-116
    Published: 2005
    Released on J-STAGE: March 11, 2015
    JOURNAL FREE ACCESS
    A chemical safety database system named CAESAR (Computer-Aided Evaluation of Chemical Safety with QSAR) has been developed to assess the toxicity for diverse organic compounds. The system contains experimental toxicity data critically reviewed on selected chemical substances, and toxicity data predicted with QSAR models for numerous, diverse chemicals in commerce. As a first step, the carcinogenicity database has been constructed, where experimental carcinogenicity data on about 400 compounds were collected from various sources such as IARC, NTP and others, and their reliabilities were ranked into nine categories. To construct a predictive model of the carcinogenicity for diverse chemicals, 70 kinds of molecular descriptors were calculated from their 3D structures for these compounds, and the relationship between experimental carcinogenicity data and 25 parameters summarized from those descriptors with the principal component analysis was analyzed with an artificial neural network. The performance of the proposed model was assessed by applying the leave-one-out cross validation test. It was found that this method can predict the relative carcinogenicity of diverse chemicals with reasonable accuracy.
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  • Maromu YAMADA, Yasunobu IWASAKA, Guangyu SHI, Atsushi MATSUKI, Dmitri ...
    2005 Volume 11 Issue 3 Pages 117-124
    Published: 2005
    Released on J-STAGE: March 11, 2015
    JOURNAL FREE ACCESS
    Aerosol particles were directly collected by a balloon-borne aerosol sampler in altitude ranges of 3–9 km over Dunhuang, China (40°00'N, 94°30'E) on August 29, 2002, March 24, 2003, and March 22, 2004, in order to investigate mixture state of aerosol particles over a source area of Asian dust particles. The shape, size, and elemental compositions of the fine particles (0.2 ‹ d ‹ 1.0 μm) were individually examined (757 fine particles in total), using a scanning electron microscope and an energy dispersive X-ray analyzer. The results suggested that submicron particles could be classified into four different types: sulfate, biomass burning, mineral dust, and heavy metal particles. Sulfate particles were predominantly detected both in the diameter range of 0.3–1.0 μm and 0.2–0.3 μm. Number fractions of mineral dust particles were considerably high in the diameter range of 0.3–1.0 μm not in that of 0.2–0.3 μm, when the atmosphere was affected by high dust loading. We also found the particles derived from biomass burning and heavy metal particles in fine mode range in the free troposphere over Dunhuang.
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  • Thi Hien TO, Tu Thanh LE, Takayuki KAMEDA, Norimichi TAKENAKA, Hiroshi ...
    2005 Volume 11 Issue 3 Pages 125-129
    Published: 2005
    Released on J-STAGE: March 11, 2015
    JOURNAL FREE ACCESS
    Measurements of polycyclic aromatic hydrocarbons (PAHs) in atmospheric particulate matters near the traffic road with different particle sizes were carried out by using a low- pressure cascade impactor from 17 Jan. 2005 to 04 Feb. 2005 in Ho Chi Minh City, Viet Nam. Average temperature during the sampling periods was 26°C (ranged from 19 to 34°C). PAHs were analyzed by high performance liquid chromatography with fluorescence detection. Total PAHs contents were mainly concentrated in particles with aerodynamic diameter smaller than 0.4μm. The particle size distributions of particulate matters (PM) and PAHs were bi-modal with a peak in fine particle mode (‹2.1μm) and another peak in coarse particle mode (›2.1μm). PM occupied approximately 80% in the coarse particles, conversely, about 80% of PAHs content associated with airborne particles was found in the fine particles smaller than 2.1μm.
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  • Le Quoc TUAN, Tran Thi Thanh HUONG, Bui Xuan AN, Tomonori KAWAKAMI
    2005 Volume 11 Issue 3 Pages 131-135
    Published: 2005
    Released on J-STAGE: March 11, 2015
    JOURNAL FREE ACCESS
    A drainage system with a cover of vegetation is considered to be one of the affordable systems as a wastewater treatment. A drainage system with vetiver grass which has special characteristics in absorbing the pollutants from wastewater was designed and applied to treat domestic wastewater. We analyzed chemical oxygen demand (COD), total nitrogen (T-N), total phosphorus (T-P) and pathogens in influent and effluent of the treatment system to evaluate the performance of the system. The system could remove 68% of T-N, 76% of T-P, 78% of COD and a considerable amount of pathogen from wastewater. The water quality of the effluent met the standard of EPA for watering plants in a garden. The results indicated that the drainage system had potential for treating domestic wastewater.
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  • Erini YUWATINI, Noriko HATA, Shigeru TAGUCHI
    2005 Volume 11 Issue 3 Pages 137-142
    Published: 2005
    Released on J-STAGE: March 11, 2015
    JOURNAL FREE ACCESS
    The behavior of di(2-ethylhexyl) phthalate (DEHP) in river water, sediment and plants in Jinzu River from upper reaches to estuary and two branches (Furu River and Itachi River) flowing to Jinzu River was investigated by a micro-organic ion-associate phase extraction and a solid phase extraction / HPLC / UV detection method. Furu River passes through a residential area and Itachi River passes sewered town areas. DEHP concentrations at a domestic wastewater discharged point in Furu River ranged 8-25 μg/L in water and 1000-2100 μg/kg in sediment. At the point in Itachi River, DEHP concentrations in water and in sediment were less than 0.6-1 μg/L and 200-500 μg/kg, respectively. In the upper reaches of Jinzu River, DEHP concentrations in water and in sediment were less than 0.6 μg/L and less than 20 μg/kg, respectively, at almost all the sampling points. At the estuary of Jinzu River, DEHP concentration in water was less than 0.6 μg/L, however; it increased up to 300 μg/kg in sediment. Clearly the pollution of sediment was serious not only at the domestic wastewater discharged point but also at the estuary. In submerged aquatic plant, Potamogeton Octandrus Poir sp., DEHP was detected only at an initial stage of the growth in May (2100μg/kg and 1800μg/kg in 2001 and 2002, respectively) and June (600μg/kg and 1100μg/kg in 2001 and 2002, respectively), while DEHP was less than 20 μg/kg in other months both in years 2001 and 2002.
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