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Guohua Shi, Changhui Peng, Meng Wang, Shengwei Shi, Yanzheng Yang, Junyao Chu, Junjun Zhang, Guanghui Lin, Yan Shen, Qiuan Zhu
The lateral transport of dissolved organic carbon (DOC) plays an important role in linking the carbon cycles of terrestrial and aquatic ecosystems. Neglecting the lateral flow of dissolved organic carbon can lead to an underestimation of the organic carbon budget of terrestrial ecosystems. It is thus necessary to integrate DOC concentrations and flux into carbon cycle models, particularly with regard to the development of models that are intended to directly link terrestrial and ocean carbon cycles. However, to achieve this goal, more accurate information is needed to better understand and predict DOC dynamics...
2016: PloS One
Jingxi Li, Chengjun Sun, Li Zheng, Xiaofei Yin, Junhui Chen, Fenghua Jiang
The geochemistry of rare earth elements (REE) in surface sediment from Cuarteron reef (N1), Johnson reef (N2), Hugh reef (N3), Gaven reef (N4), Fiery cross reef (N5), and Subi reef (N6) were firstly studied. The total REE abundance (∑REE) varied from 2.244μg·g(-1) to 21.661μg·g(-1), with an average of 4.667μg·g(-1). The LREE/HREE was from 2.747 to 9.869, with an average of 3.687, which indicated that the light REE was evidently enriched. Fractionation was observed between LREE and HREE. Gd with a negative anomaly was also detected in all of the stations...
October 13, 2016: Marine Pollution Bulletin
Jenna L Shelton, Denise M Akob, Jennifer C McIntosh, Noah Fierer, John R Spear, Peter D Warwick, John E McCray
Stimulating in situ microbial communities in oil reservoirs to produce natural gas is a potentially viable strategy for recovering additional fossil fuel resources following traditional recovery operations. Little is known about what geochemical parameters drive microbial population dynamics in biodegraded, methanogenic oil reservoirs. We investigated if microbial community structure was significantly impacted by the extent of crude oil biodegradation, extent of biogenic methane production, and formation water chemistry...
2016: Frontiers in Microbiology
Yuan Liu, Guijian Liu, Qinyuan Qu, Cuicui Qi, Ruoyu Sun, Houqi Liu
Vanadium in coals may have potential environmental and economic impacts. However, comprehensive knowledge of the geochemistry of V in coals is lacking. In this study, abundances, distribution and modes of occurrence of V are reviewed by compiling >2900 reported Chinese coal samples. With coal reserves in individual provinces as the weighting factors, V in Chinese coals is estimated to have an average abundance of 35.81 μg/g. Large variation of V concentration is observed in Chinese coals of different regions, coal-forming periods, and maturation ranks...
October 11, 2016: Environmental Geochemistry and Health
Emilie Strady, Vu Bich Hanh Dang, Julien Némery, Stéphane Guédron, Quoc Tuc Dinh, Hervé Denis, Phuoc Dan Nguyen
The Saigon River, Southern Vietnam, crosses one of the most dynamic developing Megacity in Southeast Asia: Ho Chi Minh City (HCMC). The increased economic, industrial, and domestic developments may affect the environmental quality of water and halieutic resources. In this study, we evaluated the seasonal (dry and wet seasons) biogeochemical state of the Saigon River during two snapshot campaigns conducted along the river basin upstream from HCMC; the Saigon River was characterized by slightly acidic (pH 5.7-7...
October 10, 2016: Environmental Science and Pollution Research International
Aysha Masood Khan, Nor Kartini Abu Bakar, Ahmad Farid Abu Bakar, Muhammad Aqeel Ashraf
Rare earths (RE), chemically uniform group of elements due to similar physicochemical behavior, are termed as lanthanides. Natural occurrence depends on the geological circumstances and has been of long interest for geologist as tools for further scientific research into the region of ores, rocks, and oceanic water. The review paper mainly focuses to provide scientific literature about rare earth elements (REEs) with potential environmental and health effects in understanding the research. This is the initial review of RE speciation and bioavailability with current initiative toward development needs and research perceptive...
October 10, 2016: Environmental Science and Pollution Research International
James B Bell, Alfred Aquilina, Clare Woulds, Adrian G Glover, Crispin T S Little, William D K Reid, Laura E Hepburn, Jason Newton, Rachel A Mills
Despite a number of studies in areas of focused methane seepage, the extent of transitional sediments of more diffuse methane seepage, and their influence upon biological communities is poorly understood. We investigated an area of reducing sediments with elevated levels of methane on the South Georgia margin around 250 m depth and report data from a series of geochemical and biological analyses. Here, the geochemical signatures were consistent with weak methane seepage and the role of sub-surface methane consumption was clearly very important, preventing gas emissions into bottom waters...
September 2016: Royal Society Open Science
Andrew H Knoll, Kristin D Bergmann, Justin V Strauss
Microfossils, stromatolites, preserved lipids and biologically informative isotopic ratios provide a substantial record of bacterial diversity and biogeochemical cycles in Proterozoic (2500-541 Ma) oceans that can be interpreted, at least broadly, in terms of present-day organisms and metabolic processes. Archean (more than 2500 Ma) sedimentary rocks add at least a billion years to the recorded history of life, with sedimentological and biogeochemical evidence for life at 3500 Ma, and possibly earlier; phylogenetic and functional details, however, are limited...
November 5, 2016: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
Hsin-Yi Wen, Yuji Sano, Naoto Takahata, Yama Tomonaga, Akizumi Ishida, Kentaro Tanaka, Takanori Kagoshima, Kotaro Shirai, Jun-Ichiro Ishibashi, Hisayoshi Yokose, Urumu Tsunogai, Tsanyao F Yang
Shallow submarine volcanoes have been newly discovered near the Tokara Islands, which are situated at the volcanic front of the northern Ryukyu Arc in southern Japan. Here, we report for the first time the volatile geochemistry of shallow hydrothermal plumes, which were sampled using a CTD-RMS system after analyzing water column images collected by multi-beam echo sounder surveys. These surveys were performed during the research cruise KS-14-10 of the R/V Shinsei Maru in a region stretching from the Wakamiko Crater to the Tokara Islands...
September 27, 2016: Scientific Reports
Zdzisław M Migaszewski, Agnieszka Gałuszka, Sabina Dołęgowska
A detailed hydrogeochemical study was performed in the Wiśniówka mining area (south-central Poland). This covered three acid pit bodies, historic tailings acid ponds, acid pools, and additionally two neighboring rivers. All these acid mine drainage (AMD) waters are characterized by the pH in the range of 1.7 (pools) to 3.5 (tailings ponds). The most interesting is the Podwiśniówka acid pit lake that shows a very low pH (2.2-2.5) and very high concentrations of SO4 (2-) (2720-5460 mg/L), Fe (545-1140 mg/L), Al (86...
September 25, 2016: Environmental Science and Pollution Research International
Kara E Marsac, Pamela C Burnley, Christopher T Adcock, Daniel A Haber, Russell L Malchow, Elisabeth M Hausrath
This study compares high resolution forward models of natural gamma-ray background with that measured by high resolution aerial gamma-ray surveys. The ability to predict variations in natural background radiation levels should prove useful for those engaged in measuring anthropogenic contributions to background radiation for the purpose of emergency response and homeland security operations. The forward models are based on geologic maps and remote sensing multi-spectral imagery combined with two different sources of data: 1) bedrock geochemical data (uranium, potassium and thorium concentrations) collected from national databases, the scientific literature and private companies, and 2) the low spatial resolution NURE (National Uranium Resource Evaluation) aerial gamma-ray survey...
September 15, 2016: Journal of Environmental Radioactivity
Xiaodong Zhang, Masahiko Honda, Doug Hamilton
Performance of the Helix MC Plus noble gas mass spectrometer installed at the Australian National University (ANU) is reported. Results for sensitivity, mass discrimination and their linearity against partial pressure of noble gases, and mass resolution of the mass spectrometer are presented, and the results are compared with those of conventional noble gas mass spectrometers. The application of the five detectors on the Helix MC Plus in measuring various noble gas isotopes in multi-collector modes and the integration of the software drivers of peripheral hardware devices into the controlling program Qtegra of the mass spectrometer are discussed...
September 15, 2016: Journal of the American Society for Mass Spectrometry
Dorina Murgulet, Valeriu Murgulet, Nicholas Spalt, Audrey Douglas, Richard G Hay
There is a lack of understanding and methods for assessing the effects of anthropogenic disruptions, (i.e. river fragmentation due to dam construction) on the extent and degree of groundwater-surface water interaction and geochemical processes affecting the quality of water in semi-arid, coastal catchments. This study applied a novel combination of electrical resistivity tomography (ERT) and elemental and isotope geochemistry in a coastal river disturbed by extended drought and periodic flooding due to the operation of multiple dams...
September 10, 2016: Science of the Total Environment
S Hetzinger, M Pfeiffer, W-Chr Dullo, J Zinke, D Garbe-Schönberg
Coral reefs are biologically diverse ecosystems threatened with effective collapse under rapid climate change, in particular by recent increases in ocean temperatures. Coral bleaching has occurred during major El Niño warming events, at times leading to the die-off of entire coral reefs. Here we present records of stable isotopic composition, Sr/Ca ratios and extension rate (1940-2004) in coral aragonite from a northern Venezuelan site, where reefs were strongly impacted by bleaching following the 1997-98 El Niño...
2016: Scientific Reports
Jerzy Falandysz, Martyna Saba, Hong-Gao Liu, Tao Li, Ji-Peng Wang, Anna Wiejak, Ji Zhang, Yuan-Zhong Wang, Dan Zhang
This study aimed to investigate and discuss the occurrence and accumulation of mercury in the fruiting bodies of wild-growing fungi (Macromycetes) collected from montane forests in two regions of southwestern China with differences in soil geochemistry, climate and geographical conditions. Fungal mycelia in soils of the subalpine region of the Minya Konka (Gongga Mountain) in Sichuan and in the highlands of Yunnan efficiently accumulated mercury in fruiting bodies (mushrooms). The examined sites in Yunnan with highly mineralized red and yellow soils showed Hg contents ranging from 0...
September 12, 2016: Environmental Science and Pollution Research International
R Humston, S S Doss, C Wass, C Hollenbeck, S R Thorrold, S Smith, C P Bataille
Radiogenic strontium isotope ratios ((87) Sr:(86) Sr) in otoliths were compared with isotope ratios predicted from models and observed in water sampling to reconstruct the movement histories of smallmouth bass Micropterus dolomieu between main-river and adjacent tributary habitats. A mechanistic model incorporating isotope geochemistry, weathering processes and basin accumulation reasonably predicted observed river (87) Sr:(86) Sr across the study area and provided the foundations for experimental design and inferring fish provenance...
September 12, 2016: Journal of Fish Biology
Simone Gwosdz, Julia M West, David Jones, Jana Rakoczy, Kay Green, Tom Barlow, Marco Blöthe, Karon Smith, Michael Steven, Martin Krüger
Impacts of long-term CO2 exposure on environmental processes and microbial populations of near-surface soils are poorly understood. This near-surface long-term CO2 injection study demonstrated that soil microbiology and geochemistry is influenced more by seasonal parameters than elevated CO2 Soil samples were taken during a 3-year field experiment including sampling campaigns before, during and after 24 months of continuous CO2 injection. CO2 concentrations within CO2-injected plots increased up to 23% during the injection period...
December 2016: FEMS Microbiology Ecology
Wei Yuan, Jiu Bin Chen, Jean-Louis Birck, Zuo Ying Yin, Sheng Liu Yuan, Hong Ming Cai, Zhong Wei Wang, Qiang Huang, Zhu Hong Wang
Though an isotope approach could be beneficial for better understanding the biogeochemical cycle of gallium (Ga), an analogue of the monoisotopic element aluminum (Al), the geochemistry of Ga isotopes has not been widely elaborated. We developed a two-step method for purifying Ga from geological (biological) samples for precise measurement of Ga isotope ratio using multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS). Ga was thoroughly separated from other matrix elements using two chromatographic columns loaded with AG 1-X4 and Ln-spec resin, respectively...
October 4, 2016: Analytical Chemistry
(no author information available yet)
No abstract text is available yet for this article.
2016: Nature
Jan Sedláček, Ondřej Bábek, Tereza Nováková
While numerous studies of dam reservoirs contamination are reported world-wide, we present a missing link in the study of reservoirs sourced from multiple river catchments. In such reservoirs, different point sources of contaminants and variable composition of their sedimentary matrices add to extremely complex geochemical patterns. We studied a unique, step-wise filled Nové Mlýny dam reservoir, Czech Republic, which consists of three interconnected sub-basins. Their source areas are located in units with contrasting geology and different levels and sources of contamination...
August 28, 2016: Science of the Total Environment
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