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Saputro S.,Sebelas Maret University | Masykuri M.,Sebelas Maret University | Mahardiani L.,Sebelas Maret University | Mulyani B.,Sebelas Maret University | And 4 more authors.
IOP Conference Series: Materials Science and Engineering | Year: 2017

This study aims to evaluate the usage of teak sawdust and zeolite as an adsorbent of Cr(VI) ion; optimal composition ratio of the composite adsorbent; and the sensitivity of solid-phase spectrophotometry (SPS) as a method to determine the levels of Cr(VI) ion as an adsorption results of adsorbents. The adsorbent used were teak sawdust activated carbon and zeolite as a single and composite adsorbents. The teak sawdust carbonization using muffle furnace and then activated with H3PO4 10% while the zeolite with H2SO4 10%. The contacting process of the adsorbents with Cr(VI) was done by varying the compositions. Analysis of Cr(VI) level was done using SPS method. Characterization of adsorbent before and after being activated is done using a FTIR. The results showed that teak sawdust and zeolite can be used as adsorbents to adsorb Cr(VI) in the simulated liquid waste with the adsorption capacity 1.19 μg/g; the optimum composition ratio of teak sawdust activated carbon and zeolite was 75%:25% with the percentage of adsorption was 62.72%. Solid-phase spectrophotometry is a sensitive method to analyze the decreased levels of Cr(VI) as an adsorption results in μg/L level with the limit of detection (LOD) was 0.03 μg/L. © Published under licence by IOP Publishing Ltd.


Tamari T.,Kyushu Environmental Evaluation Association | Kakiuchi H.,Insutitue for Environmental science | Momoshima N.,Kyushu University | Baglan N.,CEA DAM Ile-de-France | And 2 more authors.
Fusion Science and Technology | Year: 2011

We carried out OBT (organically bound tritium) measurement by two different methods those are radiometry and mass spectrometry and compared the applicability of these methods for environmental tritium analysis. The dried grass sample was used for the experiments. To eliminate the exchangeable OBT, the sample was washed with tritium free water before analysis. Three times washing reduced the tritium activity in the labile sites below the detectable level. In radiometry the sample was combusted to convert the OBT as well as other hydrogen isotopes to water and tritium activity in the water was measured by liquid scintillation counting (LSC). In mass spectrometry, the sample was kept in a glass container and 3He produced by tritium decay was measured by mass spectrometry. The results were in good agreement suggesting applicability of these methods for environmental tritium analysis. The mass spectrometry is more suitable for environmental tritium research because of a lower detection limit than that of the LSC.


Saputro S.,Sebelas Maret University | Yoshimura K.,Kyushu University | Matsuoka S.,Niigata University | Takehara K.,Kyushu University | And 3 more authors.
Chemical Geology | Year: 2014

The circulation of chromium at naturally occurring concentration levels (i.e., 1μgdm-3 or lower) was examined using solid-phase spectrophotometry and inductively coupled plasma-mass spectrophotometry (ICP-MS) to determine the Cr(VI) and Cr(Total) concentrations, respectively. Natural water and stream sediments were collected from areas with various types of geologic features, such as metamorphic rocks, volcanic rocks and limestone in Japan and Indonesia. Cr(VI) was predominant in weakly alkaline natural waters, and the Cr(III) concentration was less than 1μgdm-3, which was considerably lower than that expected based on the solubility of Cr(OH)3. The dissolution of chromium in natural water was described by the leaching of Cr(VI) from Cr(III)-containing minerals under oxic conditions. The Cr(VI) concentration in a solution that was in contact with chromite, FeCr2O4, linearly increased with the reaction time. The results indicated that under oxic conditions at PO2=0.21atm, the leaching rate of Cr(VI) was pseudo zero-order at a fixed pH and was higher in alkaline than in acidic solutions. The removal of Cr from natural waters was due to the reduction of Cr(VI) to Cr(III) by organic matter, such as humic substances, as well as to the adsorption of Cr(III) onto suspended matter and river sediments. The reduction of Cr(VI) to Cr(III) followed the equation -d[Cr(VI)]/dt=[H+]a[Cr(VI)][DOC] with a=0 at pH<4 and a=-1 at pH>4.5. The removal of Cr(III) by river sediments and/or suspended particulate matter was rapid and the adsorbability of Cr(III) was dependent on pH, which suggests that the active species were Cr(OH)2 + and Cr(OH)3. Schematic models of the circulation of dissolved chromium in natural water were proposed under acidic and alkaline conditions. © 2013 Elsevier B.V.


Sakai S.,Humanity | Kawakita A.,Kyoto University | Ooi K.,Kyushu Environmental Evaluation Association | Inoue T.,Kyoto University
American Journal of Botany | Year: 2013

Premise of the study: Diversification of floral traits in angiosperms is often attributed to have been driven by adaptations to pollinators. Nevertheless, phylogenetic studies on the relationships among evolutionary changes in floral traits and pollination systems are still limited. We examined the relationships between floral trait changes and pollinator shifts in Bornean gingers (Zingiberaceae). These plants have strongly zygomorphic flowers pollinated by spiderhunter birds, bees of the genus Amegilla, and halictid bees. Methods: We identified pollination systems through field observations and recorded petal color, quantity of floral rewards, and seven measures of flower morphology in 28 ginger species. Phylogenetic trees were constructed from nucleotide sequences of the matK and ITS regions. We examined the correlations between the evolution of pollination systems and floral traits using phylogenetically independent contrasts. Key Results: Significant association was found between pink color and spiderhunter pollination, orange and Amegilla pollination, and yellow and white and halictid pollination. Sugar production was higher in spiderhunter-pollinated species and lower in halictid-pollinated. Meanwhile, there was a significant association only for a subset of the floral morphological characters measured. Floral tube length, which is often thought to evolve to match the lengths of pollinator probing apparatuses, did not show any correlation. Conclusions: There is considerable variation in the strength of association among pollination systems and floral traits. Lack of significant correlation in some traits could partly be explained by floral functions other than pollination, such as adaptations to prevent herbivore damage to the ovules. Further studies on these factors may improve understanding of plant-pollinator interactions. © 2013 Botanical Society of America.


Park J.-I.,Kuwait Institute for Scientific Research | Al-Mutairi A.,Kuwait Institute for Scientific Research | Marafi A.M.J.,Kuwait Institute for Scientific Research | Mochida I.,Kyushu Environmental Evaluation Association | And 2 more authors.
Journal of Industrial and Engineering Chemistry | Year: 2016

Behaviors of vanadium and nickel species during hydrodemetallization (HDM) were studied. A Kuwait atmospheric residue and its hydrodemetallized products from a pilot plant at mild and severe reaction conditions were characterized by using GPC coupled with ICP-MS and high temperature GC-AED after separation of them into saturates, aromatics, resins, and asphaltenes. It was found that the HDM reactivity of the vanadium species, especially those with lower molecular weight, was higher than that of Ni species, probably due to the higher polarity of the former than the latter. HDM of the vanadium species in the asphaltene was more difficult than that in the resin. The average molecular weight of metal species through higher temperature HDM was higher than that through the lower temperature HDM, although the metal removal at the higher temperature is higher. © 2016 The Korean Society of Industrial and Engineering Chemistry.


Anan M.,Takasaki Sogo Consultant Co. | Yuge K.,Kyushu University | Oohira Y.,Kyushu Environmental Evaluation Association
Paddy and Water Environment | Year: 2012

The subject of this study is water management in low-lying paddy fields. The objective of this study is to quantify the water requirement, and estimate an appropriate volume and facilitate management of irrigation water in areas where it is difficult to estimate the flow rate continuously. A field observation was conducted at a 14-ha study site located in the Kuwabara area, Fukuoka City, southwest of Japan, to evaluate water management conditions in the command area of the reservoir. This site near the reservoir was selected, because it was impossible to understand the water supply situation in the entire command area. The farmers in this region have been unable to retain sufficient irrigation water. The observation results indicate that the water depth fluctuates widely in every irrigation canal. The canals are frequently empty because rotational irrigation is conducted by water managers; this makes quantifying the flow rate in the irrigation canal very difficult. To quantify the water requirement, an improved tank model was introduced. The accuracy of the model was examined by comparing the observed and calculated ponding depths at a paddy field. The simulation results agreed with the observed data. Using this model, water management for the reduction of water managers' labor was simulated. Simulation results indicated that rotational irrigation effectively reduces labor and saves irrigation water. © 2011 Springer-Verlag.


Ueda S.,Japan Institute for Environmental Sciences | Kakiuchi H.,Japan Institute for Environmental Sciences | Hasegawa H.,Japan Institute for Environmental Sciences | Akata N.,Japan Institute for Environmental Sciences | And 2 more authors.
Journal of Radioanalytical and Nuclear Chemistry | Year: 2014

The spent nuclear fuel reprocessing plant in Rokkasho, Japan, has been undergoing final testing since March 2006. The concentrations of 129I in environmental water samples collected around the reprocessing plant were measured from 2005 to 2012. The 129I concentrations in water samples of the brackish lake adjacent to a plant from 2006 to 2008 which the spent fuel rods were cut and chemically processed, was higher than the background level. The major source of 129I in the lake was dominated by the direct deposition of 129I from the atmosphere than that from the ocean. © 2014 Akadémiai Kiadó, Budapest, Hungary.


Ueda S.,Japan Institute for Environmental Sciences | Kakiuchi H.,Japan Institute for Environmental Sciences | Hasegawa H.,Japan Institute for Environmental Sciences | Kawamura H.,Kyushu Environmental Evaluation Association | Hisamatsu S.,Japan Institute for Environmental Sciences
Radiation Protection Dosimetry | Year: 2015

The spent nuclear fuel reprocessing plant in Rokkasho, Japan, has been undergoing final testing since March 2006. During April 2006-October 2008, that spent fuel was cut and chemically processed, the plant discharged 129I into the atmosphere and coastal waters. To study 129I behaviour in brackish Lake Obuchi, which is adjacent to the plant, 129I concentrations in aquatic biota were measured by accelerator mass spectrometry. Owing to 129I discharge from the plant, the 129I concentration in the biota started to rise from the background concentration in 2006 and was high during 2007-08. The 129I concentration has been rapidly decreasing after the fuel cutting and chemically processing were finished. The 129I concentration factors in the biota were higher than those reported by IAEA for marine organisms and similar to those reported for freshwater biota. The estimated annual committed effective dose due to ingestion of foods with the maximum 129I concentration in the biota samples was 2.8 nSv y-1. © The Author 2015. Published by Oxford University Press. All rights reserved.


Takagi M.,Osaka City University | Saitoh T.,Yamashina Institute for Ornithology | Yamaguchi N.,Nagasaki University | Okabe H.,Kyushu Environmental Evaluation Association | And 2 more authors.
Ornithological Science | Year: 2015

A nest of the Ryukyu Scops Owl Otus elegans was found on Okinoshima (Okino Island), Fukuoka Prefecture, Japan (34.24°N, 130.10°E), in the Tsushima Strait, on 28 July 2013. The breeding pair and their three owlets were caught and their identity confirmed genetically using the BOLD System for COI in the mitochondrial genome. Their calls and external morphological measurements also accorded with what is known of the species. We estimated that at least 23 territorial males inhabit the Island. Okinoshima lies 490 km beyond the previously known northern limit of the species’ distribution. © The Ornithological Society of Japan 2015


Kakiuchi H.,Intituefor Environmental science | Hasegawa H.,Intituefor Environmental science | Akata N.,Intituefor Environmental science | Tamari T.,Kyushu Environmental Evaluation Association | And 5 more authors.
Fusion Science and Technology | Year: 2011

We adeveloped an analytical method for organically bound 3T) in biological environmental samples by using noble gas mass spectrometry of 3He produced from 3 . Three environmental samples with background level OBT concentrations were analyzed, and the results agreed well with those by the conventional liquid scintillation counting of electrolyzed combustion water of the samples. This showed that the method is practical and effective. We also developed an analytical method for nonexchangeable OBT as a combination of pre-treatment of dried samples with free water 3H and our newly developed analytical method for OBT. The repeated analysis of a grass sample with moderate 3H concentration had smaller variance of results for non-exchangeable OBT than for OBT. The sum of non-exchangeable and exchangeable OBT agreed well with OBT measured in the samples. The developed method was successfully applied to terrestrial and marine environmental samples with background 3H levels.

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