Abstract Cesium adsorption/desorption experiments for various clay minerals, considering actual contamination conditions in Fukushima, were conducted using the 137 Cs radioisotope and an autoradiography imaging plates (IPs). A 50 μl solution containing 0.185 ~ 1.85 Bq of (10 −11 10 −9 molL −1 Cs) was dropped onto a substrate where mineral particles arranged. It found that partially-vermiculitized biotite, which is termed “weathered biotite” (WB) this study, from Fukushima sorbed far more...

Radioactive soil particles several tens of micrometers in size were collected from litter the radiation contaminated area by Fukushima nuclear plant accident and characterized using electron X-ray microanalyses. The radioactive discriminated autoradiography imaging plates (IP) on which microgrids formed laser ablation order to find under microscopy. Fifty identified classified into three types their morphology chemical composition, namely: (1) aggregates clay minerals, (2) organic matter...

Concentrations of dissolved oxygen and inorganic nitrogenous compounds in burrows occupied by the shrimps Callianassa japonica (de Haan) Upogebia major were compared to those overlying waters under simulated situ conditions.Dissolved content burrow was considerably lower; it ranged from 12 45 % saturation values for C. 30 41 U. respectively.One order magnitude higher ammonium 2 3 times nitrate plus nitrite values, waters, also observed.Both nitrogen data indicate that water is distinctively...

Microparticles of radioactive cesium (Cs)-bearing silicate glass emitted from the Fukushima Daiichi nuclear power plant were investigated mainly using state-of-the-art energy-dispersive X-ray spectroscopy in scanning transmission electron microscopes. Precise elemental maps particles obtained double silicon drift detectors with a large collection angle X-rays, and qualitative analysis was performed high-resolution microcalorimetry detector. Beside substantial elements (O, Si, Cl, K, Fe, Zn,...

Caledonian amphibolite-facies shear zones developed in granulite-facies anorthosites and anorthositic gabbros of the Bergen Arcs, western Norway, allow a detailed study relationships between fluid-infiltration, mineral reactions, evolution microstructure deformation mechanisms. A sequence rocks from relatively pristine granulites into zone has been studied by optical microscopy, electron microprobe microanalysis (EMPA), scanning microscopy (SEM), backscatter diffraction (EBSD) transmission...

Ambient concentrations of four marine‐derived halocarbons (methyl iodide, ethyl bromoform and dibromomethane) two man‐made (trichloroethylene tetrachloroethylene) were measured during western Pacific cruises east southeast Asian cruises. Ethyl iodide was detected in the atmosphere for first time identified as an atmospheric iodine source compound. Bromoform positively correlated with those dibromomethane, methyl showed variations similar to iodide. However, there no correlation between...

The sorption characteristics of cesium (Cs) ions into weathered biotite with biotite–vermiculite interstratification collected from granodiorite in Fukushima Prefecture, Japan has been investigated. Both single crystals and crushed powder forms the were experimentally reacted 20–2000 ppm CsCl aqueous solutions, analyzed by X–ray diffraction (XRD), scanning electron microscopy (SEM) transmission (STEM) to examine distribution Cs inside crystals. From XRD pattern, proportion vermiculite unit...

Abstract The stimulation of bacterial activities that convert hexavalent uranium, U(VI), to tetravalent U(IV), appears be feasible for cost-effective remediation contaminated aquifers. However, U(VI) reduction typically results in the precipitation U(IV) particles less than 5 nanometers diameter, except environmental conditions enriched with iron. Because these tiny are mobile and susceptible oxidative dissolution after termination nutrient injection, situ bioremediation remains impractical....

Radioactive particles of around 50 µm size were collected from highly contaminated soil in the Fukushima Prefecture, Japan, and characterized using micro X–ray diffraction with synchrotron radiation (SR–µ–XRD). Two–dimensional patterns individual rotated during irradiation recorded on a flat imaging plate one–dimensional profile, as function 2θ, was derived pattern. Weathered biotite (WB) plate–like morphology showed broad peak corresponding to basal reflection d = 10–14 Å, indicating...

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 293:59-68 (2005) - doi:10.3354/meps293059 Nitrogen dynamics of surfgrass Phyllospadix iwatensis N. Hasegawa1,4,*, H. Iizumi2, Mukai3 1Graduate School Science, Hokkaido University, 5 Aikappu, Akkeshi-cho Akkeshi-gun, 088-1113, Japan2Japan Sea National Fisheries Research Institute, 1-5939-22 Suidou-cho, Niigata...

Abstract In this work, we investigated the seasonal cycle of atmospheric potential oxygen (APO), a unique tracer air‐sea gas exchanges molecular (O 2 ) and carbon dioxide (CO ), expressed as APO = O + 1.1 × CO . data were obtained from flask air samples collected since late 1990s at three Japanese ground stations on commercial cargo ships sailing between Japan Australia/New Zealand, North America, Southeast Asia. We also analyzed spatial distribution cycles with simulations an transport...

Abstract. We conducted soil warming experiment in a cool-temperate forest with peat northern Japan, during the snowless seasons of 2007–2009. Our objective was to determine whether or not heterotrophic respiration rate and temperature sensitivity would change by warming. elevated 3 °C at 5 cm depth means overhead infrared heaters continuously measured CO2 fluxes using fifteen-channel automated chamber system. Trenching treatment also carried out separate root from total respiration. The...

Abstract. We examined potential interferences from water vapor and atmospheric background gases (N2, O2, Ar), biases by isotopologues of target species, on accurate measurement CO2 CH4 means wavelength-scanned cavity ring-down spectroscopy (WS-CRDS). Variations in the composition gas substantially impacted measurements: measured amounts decreased with increasing N2 mole fraction, but increased O2 Ar, suggesting that pressure-broadening effects (PBEs) as Ar < N2. Using these experimental...