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Aouda Khalfa, Senia Mellouk, Kheira Marouf-Khelifa, Amine Khelifa
Dolomite was treated at 800 °C (D800), characterized, and used in the adsorptive removal of catechol (1,2-dihydroxybenzene) from aqueous solutions. The performances of the D800 sample, named dolomitic solid, were compared with those of the raw material. A bibliographic review shows that the data on the adsorption of phenolic compounds by dolomites are non-existent. Kinetic data, equilibrium isotherms, thermodynamic parameters, and pH influence were reported. Special attention was paid to the spectroscopic study, before and after adsorption...
April 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Pizzolotto Roberto, Brandmayr Pietro
Is it correct to look for a supposedly missing species by focusing research at the type locality? A species can be declared extinct because for an unusual amount of time it has not been seen again; however, in the frame of the climate change it is likely that a supposedly missing species is a lucky survivor not seen because it was not searched for in the correct environment. We used the strictly endemic Leistus punctatissimus Breit, 1914 (Coleoptera, Carabidae) as the case study for testing the latter hypothesis vs...
2018: ZooKeys
Tsiverihasina V Rakotonimaro, Carmen Mihaela Neculita, Bruno Bussière, Thomas Genty, Gérald J Zagury
Multi-step passive systems for the treatment of iron-rich acid mine drainage (Fe-rich AMD) perform satisfactorily at the laboratory scale. However, their field-scale application has revealed dissimilarities in performance, particularly with respect to hydraulic parameters. In this study, the assessment of factors potentially responsible for the variations in performance of laboratory and field-scale multi-step systems was undertaken. Three laboratory multi-step treatment scenarios, involving a combination of dispersed alkaline substrate (DAS) units, anoxic dolomitic drains, and passive biochemical reactors (PBRs), were set up in 10...
April 17, 2018: Environmental Science and Pollution Research International
Massimo Bernardi, Piero Gianolla, Fabio Massimo Petti, Paolo Mietto, Michael J Benton
Dinosaurs diversified in two steps during the Triassic. They originated about 245 Ma, during the recovery from the Permian-Triassic mass extinction, and then remained insignificant until they exploded in diversity and ecological importance during the Late Triassic. Hitherto, this Late Triassic explosion was poorly constrained and poorly dated. Here we provide evidence that it followed the Carnian Pluvial Episode (CPE), dated to 234-232 Ma, a time when climates switched from arid to humid and back to arid again...
April 16, 2018: Nature Communications
Pouyan Ebrahimi, Javier Vilcáez
To assess the risk of underground sources of drinking water contamination by barium (Ba) present in petroleum produced water disposed into deep saline aquifers, we examined the effect of salinity (NaCl), competition of cations (Ca, Mg), temperature (22 and 60°C), and organic fracturing additives (guar gum) on the sorption and transport of Ba in dolomites and sandstones. We found that at typical concentration levels of NaCl, Ca, and Mg in petroleum produced water, Ba sorption in both dolomites and sandstones is inhibited by the formation of Ba(Cl)+ complexes in solution and/or the competition of cations for binding sites of minerals...
April 12, 2018: Science of the Total Environment
Sergio Rusi, Diego Di Curzio, William Palmucci, Riccardo Petaccia
The water-rock interaction is discussed in this study for some Central Apennine aquifers and their relative springs, where the geological and hydrogeological setting is potentially responsible for hydrocarbon contamination. The contamination is related to the presence of limestone formations with high organic content that are connected to the genesis of hydrocarbons in the Central-Southern Apennines. Thanks to a multidisciplinary approach based on a seasonal monitoring of hydrogeological, hydrogeochemical, organic chemical, and isotopic variables, and to a detailed geological analysis, it was possible to demonstrate that the bituminous schists within the bituminous dolomite formation (a Triassic Formation presents in the Gran Sasso acquifer), the bituminous intercalations within the Bolognano Formation (an Olocenic calcareous Formation in the Majella acquifer), and the petroleum-saturated rocks of the Bolognano Formation (in the Morrone acquifer) are all able to leach hydrocarbons into groundwater...
March 23, 2018: Environmental Science and Pollution Research International
C L Blättler, M W Claire, A R Prave, K Kirsimäe, J A Higgins, P V Medvedev, A E Romashkin, D V Rychanchik, A L Zerkle, K Paiste, T Kreitsmann, I L Millar, J A Hayles, H Bao, A V Turchyn, M R Warke, A Lepland
Major changes in atmospheric and ocean chemistry occurred in the Paleoproterozoic Era (2.5-1.6 billion years ago). Increasing oxidation dramatically changed Earth's surface, but few quantitative constraints exist on this important transition. This study describes the sedimentology, mineralogy, and geochemistry of a two-billion-year-old and ~800 m-thick evaporite succession from the Onega Basin in Russian Karelia. The deposit consists of a basal unit dominated by halite (~100 m) followed by anhydrite-magnesite (~500 m) and dolomite-magnesite (~200 m) dominated units...
March 22, 2018: Science
Kamal T Hindy, Ashraf R Baghdady, Fares M Howari, Ahmed S Abdelmaksoud
This study is concerned with the identification of the mineralogical composition of dust fall samples collected from southeast of Cairo, Egypt. The mineralogical identification was conducted by means of the polarizing microscope, infra-red spectroscopy (IR), and X-ray diffraction (XRD). The relationship between the mineralogical composition of dust fall samples and 10 rock samples from the surrounding terrains were investigated. The major mineralogical species existing in the atmosphere of the study area are: carbonates mainly in the form of calcite in addition to the appearance of the dolomite form in traces overall the study area, but with considerable observation in the southern region; quartz which is less than calcite in its abundance; sulphates in the form of gypsum which may also be present as traces in the anhydrite form...
March 21, 2018: International Journal of Environmental Research and Public Health
Pouyan Ebrahimi, Javier Vilcáez
This research aimed to elucidate the effect of brine salinity and guar gum on the sorption and transport of Ba in dolomite rocks collected from the Arbuckle formation in Oklahoma, USA. Guar gum represents the most important organic additive used in viscosified fracturing fluids, and Ba constitutes the most common and abundant heavy metal found in unconventional oil and gas (UOG) wastewater. Batch experiments conducted using powdered dolomite rocks (500-600 μm particle size) revealed that at brine salinities of UOG wastewater, chloro-complexation reactions between Ba and Cl ions and pH changes that results from dolomite dissolution are the controlling factors of Ba sorption on dolomite...
March 12, 2018: Journal of Environmental Management
Radhouan El Zrelli, Lotfi Rabaoui, Nabil Daghbouj, Heithem Abda, Sylvie Castet, Claudie Josse, Pieter van Beek, Marc Souhaut, Sylvain Michel, Nejla Bejaoui, Pierre Courjault-Radé
Since the establishment of the coastal industrial complex in Gabes city (Gulf of Gabes, SE Tunisia), hundred million tons of untreated phosphogypsum have been discharged in the open sea causing serious environmental problems. To better understand the dynamic and behavior of phosphate/phosphogypsum contaminants from raw ores to marine environment, a chemical, organic, mineralogical, and morphological characterization of phosphate rock and phosphogypsum was conducted using several sophisticated techniques. The chemical analysis showed that phosphate and phosphogypsum contain high loads of trace elements and that the transfer factors of pollutants varied from 5...
March 12, 2018: Environmental Science and Pollution Research International
Fei Li, Ximin Zhang, Jiyi Gong, Lunxian Liu, Yin Yi
Karst topography is formed from the dissolution of soluble rocks, such as limestone and dolomite. In soils of such a landform, excessive contents of exchangeable calcium seriously limit the growth of vegetations. Researches have proved that rhizosphere microorganisms and endophytes help host plants to adapt to various adverse environments. The adaptive capacity of plants that grow in adverse environment with salt, drought, thermal and heavy metal stresses partially or completely comes from symbiotic microorganisms...
2018: PloS One
Danni Li, Xubo Gao, Yanxin Wang, Wenting Luo
Excessive amounts of fluoride in drinking groundwater are harmful to human health, but the mechanisms responsible for fluoride enrichment in groundwater are not fully understood. Samples from two neighboring areas with endemic fluorosis were collected to test the hypothesis that there are distinctly different mechanisms responsible for the enrichment of fluoride in these groundwater. Hydrochemistry, stable isotopes and geochemical simulation were conducted together to investigate the fluoride spatial distribution and the diversity of responsible mechanisms...
March 1, 2018: Environmental Pollution
C Ribeiro, F B Scheufele, H J Alves, A D Kroumov, F R Espinoza-Quiñones, A N Módenes, C E Borba
No abstract text is available yet for this article.
February 16, 2018: Environmental Technology
Tai-Hsiang Huang, Yun-Jie Lai, Zeng-Yei Hseu
In situ stabilization of trace elements by adding cheap amendments is an emerging technology for large-scale soil remediation. Various amendments have been examined well in the literature, but related have focused predominantly on short-term laboratory scale incubation or pot experiments. This study applied dolomitic lime at 40 ton ha-1, oyster shell (OS) at 80 ton ha-1, and sugarcane bagasse compost (SC) at 60 ton ha-1 to a paddy field in Taiwan for two rice (Oryza sativa L.) cropping seasons. The aims of study were to gain an understanding of the bioavailable concentrations of Cr, Ni, Cu, and Zn in the amended soil and the metal uptake of rice for practical amendment use in field-scale remediation of contaminated soils...
January 31, 2018: Chemosphere
Xueru Guo, Rui Zuo, Li Meng, Jinsheng Wang, Yanguo Teng, Xin Liu, Minhua Chen
Globally, groundwater resources are being deteriorated by rapid social development. Thus, there is an urgent need to assess the combined impacts of natural and enhanced anthropogenic sources on groundwater chemistry. The aim of this study was to identify seasonal characteristics and spatial variations in anthropogenic and natural effects, to improve the understanding of major hydrogeochemical processes based on source apportionment. 34 groundwater points located in a riverside groundwater resource area in northeast China were sampled during the wet and dry seasons in 2015...
February 6, 2018: International Journal of Environmental Research and Public Health
Aung Zaw Oo, Shigeto Sudo, Hiroko Akiyama, Khin Thuzar Win, Akira Shibata, Akinori Yamamoto, Tomohito Sano, Yuhei Hirono
A laboratory study was conducted to study the effects of liming and different biochar amendments on N2O and CO2 emissions from acidic tea field soil. The first experiment was done with three different rates of N treatment; N 300 (300 kg N ha-1), N 600 (600 kg N ha-1) and N 900 (900 kg N ha-1) and four different rates of bamboo biochar amendment; 0%, 0.5%, 1% and 2% biochar. The second experiment was done with three different biochars at a rate of 2% (rice husk, sawdust, and bamboo) and a control and lime treatment (dolomite) and control at two moisture levels (50% and 90% water filled pore space (WFPS))...
2018: PloS One
Pawan Kumar Gaury, Narendra Kumar Meena, A K Mahajan
The present research is to study hydrochemistry and water quality of Rewalsar Lake during pre-monsoon, monsoon, and post-monsoon seasons. The Ca2+ and Na+ are observed as the dominant cations from pre- to post-monsoon season. On the other hand, HCO3- and Cl- are observed dominant anions during pre-monsoon and monsoon seasons, whereas HCO3- and SO42- during post-monsoon season. The comparison of alkaline earth metals with alkali metals and total cations (Tz+) has specified that the carbonate weathering is the dominant source of major ions in the water of lake...
January 17, 2018: Environmental Monitoring and Assessment
Muhammad Shaaban, Yupeng Wu, Muhammad Salman Khalid, Qi-An Peng, Xiangyu Xu, Lei Wu, Aneela Younas, Saqib Bashir, Yongliang Mo, Shan Lin, Muhammad Zafar-Ul-Hye, Muhammad Abid, Ronggui Hu
Several studies have been carried out to examine nitrous oxide (N2 O) emissions from agricultural soils in the past. However, the emissions of N2 O particularly during amelioration of acidic soils have been rarely studied. We carried out the present study using a rice-rapeseed rotation soil (pH 5.44) that was amended with dolomite (0, 1 and 2 g kg-1 soil) under 60% water filled pore space (WFPS) and flooding. N2 O emissions and several soil properties (pH, NH4 + N, NO3 - -N, and nosZ gene transcripts) were measured throughout the study...
April 2018: Environmental Pollution
Mehmet Yesiltas
Synchrotron-based high spatial resolution hyperspectral infrared imaging technique provides thousands of infrared spectra with high resolution, thus allowing us to acquire detailed spatial maps of chemical molecular structures for many grains in short times. Utilizing this technique, thousands of infrared spectra were analyzed at once instead of inspecting each spectrum separately. Sutter's Mill meteorite is a unique carbonaceous type meteorite with highly heterogeneous chemical composition. Multiple grains from the Sutter's Mill meteorite have been studied using this technique and the presence of both hydrous and anhydrous silicate minerals have been observed...
April 5, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Maja Radziemska, Eugeniusz Koda, Ayla Bilgin, Mgdalena D Vaverková
The experiment was carried out in order to evaluate the effects of trace element immobilizing soil amendments, i.e., chalcedonite, dolomite, halloysite, and diatomite on the chemical characteristics of soil contaminated with Cr and the uptake of metals by plants. The study utilized analysis of variance (ANOVA), principal component analysis (PCA) and Factor Analysis (FA). The content of trace elements in plants, pseudo-total and extracted by 0.01 M CaCl₂, were determined using the method of spectrophotometry...
December 23, 2017: International Journal of Environmental Research and Public Health
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