keyword
MENU ▼
Read by QxMD icon Read
search

Dolomite

keyword
https://www.readbyqxmd.com/read/28525719/phosphorus-availability-and-release-pattern-from-activated-dolomite-phosphate-rock-in-central-florida
#1
Xiaoyun Mao, Qin Lu, Wei Mo, Xiaoping Xin, Xian Chen, Zhenli He
In this study, novel technology was developed to convert dolomite phosphate rock (DPR) into slow release P fertilizers. The DPR was powdered to < 100 mesh and activated with organic molecules under optimal reaction conditions. As compared to original DPR, available P, estimated by water soluble P released from the three DPRs activated with three types of organic molecules, increased by 6.86, 3.32, and 7.46 times, respectively. Phosphorus supply from the activated DPRs was greater than that of superphosphates (SP)...
May 19, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28521958/eutrophication-decrease-phosphate-adsorption-processes-in-presence-of-nitrates
#2
Susana P Boeykens, M Natalia Piol, Lisa Samudio Legal, Andrea B Saralegui, Cristina Vázquez
Eutrophication causes aquatic environment degradation as well as serious problems for different purposes of water uses. Phosphorus and nitrogen, mainly as phosphate and nitrate respectively, are considered responsible for eutrophication degradation. The focus of this work was the study of adsorption processes for decreasing phosphate and nitrate concentrations in bi-component aqueous systems. Dolomite and hydroxyapatite were selected as low-cost adsorbents. Obtained results showed that both adsorbents have high capacity for phosphate adsorption which the presence of nitrate does not modify...
May 15, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28463699/waste-heaps-left-by-historical-zn-pb-ore-mining-are-hotspots-of-species-diversity-of-beech-forest-understory-vegetation
#3
Marcin W Woch, Anna M Stefanowicz, Małgorzata Stanek
Metalliferous mining and smelting industries are associated with very high levels of heavy metal(loid) contamination of the environment. Heavy metals have been proved to significantly influence the species diversity and composition of grassland communities, but little is known on their effects on forest understory vegetation. Therefore, the aim of this study was to investigate the effects of the presence of small heaps of waste rock left by historical Zn-Pb ore mining on understory vegetation. The heaps are scattered over vast areas of beech forests in southern Poland...
April 29, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28401910/smelting-magnesium-metal-using-a-microwave-pidgeon-method
#4
Yuji Wada, Satoshi Fujii, Eiichi Suzuki, Masato M Maitani, Shuntaro Tsubaki, Satoshi Chonan, Miho Fukui, Naomi Inazu
Magnesium (Mg) is a lightweight metal with applications in transportation and sustainable battery technologies, but its current production through ore reduction using the conventional Pidgeon process emits large amounts of CO2 and particulate matter (PM2.5). In this work, a novel Pidgeon process driven by microwaves has been developed to produce Mg metal with less energy consumption and no direct CO2 emission. An antenna structure consisting of dolomite as the Mg source and a ferrosilicon antenna as the reducing material was used to confine microwave energy emitted from a magnetron installed in a microwave oven to produce a practical amount of pure Mg metal...
April 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28291791/three-dimensional-preservation-of-cellular-and-subcellular-structures-suggests-1-6-billion-year-old-crown-group-red-algae
#5
Stefan Bengtson, Therese Sallstedt, Veneta Belivanova, Martin Whitehouse
The ~1.6 Ga Tirohan Dolomite of the Lower Vindhyan in central India contains phosphatized stromatolitic microbialites. We report from there uniquely well-preserved fossils interpreted as probable crown-group rhodophytes (red algae). The filamentous form Rafatazmia chitrakootensis n. gen, n. sp. has uniserial rows of large cells and grows through diffusely distributed septation. Each cell has a centrally suspended, conspicuous rhomboidal disk interpreted as a pyrenoid. The septa between the cells have central structures that may represent pit connections and pit plugs...
March 2017: PLoS Biology
https://www.readbyqxmd.com/read/28287717/reaction-rates-in-chemically-heterogeneous-rock-coupled-impact-of-structure-and-flow-properties-studied-by-x-ray-microtomography
#6
Yousef Al-Khulaifi, Qingyang Lin, Martin J Blunt, Branko Bijeljic
We study dissolution in a chemically heterogeneous medium consisting of two minerals with contrasting initial structure and transport properties. We perform a reactive transport experiment using CO2-saturated brine at reservoir conditions in a millimeter-scale composite core composed of Silurian dolomite and Ketton limestone (calcite) arranged in series. We repeatedly image the composite core using X-ray microtomography (XMT) and collect effluent to assess the individual mineral dissolution. The mineral dissolution from image analysis was comparable to that measured from effluent analysis using inductively coupled plasma mass spectrometry (ICP-MS)...
March 23, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28283029/legal-immigrants-invasion-of-alien-microbial-communities-during-winter-occurring-desert-dust-storms
#7
Tobias Weil, Carlotta De Filippo, Davide Albanese, Claudio Donati, Massimo Pindo, Lorenzo Pavarini, Federico Carotenuto, Massimiliano Pasqui, Luisa Poto, Jacopo Gabrieli, Carlo Barbante, Birgit Sattler, Duccio Cavalieri, Franco Miglietta
BACKGROUND: A critical aspect regarding the global dispersion of pathogenic microorganisms is associated with atmospheric movement of soil particles. Especially, desert dust storms can transport alien microorganisms over continental scales and can deposit them in sensitive sink habitats. In winter 2014, the largest ever recorded Saharan dust event in Italy was efficiently deposited on the Dolomite Alps and was sealed between dust-free snow. This provided us the unique opportunity to overcome difficulties in separating dust associated from "domestic" microbes and thus, to determine with high precision microorganisms transported exclusively by desert dust...
March 10, 2017: Microbiome
https://www.readbyqxmd.com/read/28281141/oxidative-potential-op-and-mineralogy-of-iron-ore-particulate-matter-at-the-gol-e-gohar-mining-and-industrial-facility-iran
#8
Naghmeh Soltani, Behnam Keshavarzi, Armin Sorooshian, Farid Moore, Christina Dunster, Ana Oliete Dominguez, Frank J Kelly, Prakash Dhakal, Mohamad Reza Ahmadi, Sina Asadi
Concentrations of total suspended particulate matter, particulate matter with aerodynamic diameter <2.5 μm (PM2.5), particulate matter <10 μm (PM10), and fallout dust were measured at the Iranian Gol-E-Gohar Mining and Industrial Facility. Samples were characterized in terms of mineralogy, morphology, and oxidative potential. Results show that indoor samples exceeded the 24-h PM2.5 and PM10 mass concentration limits (35 and 150 µg m(-3), respectively) set by the US National Ambient Air Quality Standards...
March 9, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28265834/characteristics-and-quality-of-reservoir-sediments-mujib-dam-central-jordan-as-a-case-study
#9
Nazem El-Radaideh, Ahmed A Al-Taani, Wesam M Al Khateeb
This paper focuses on characterizing the current status of physiochemical properties of Mujib Dam sediments. Five types of granulometric textural facies were observed for the bottom sediments of Mujib reservoir bed; these are clayey facies, clayey-silt facies, sand-silt-clay facies, sand facies, and granule facies. This average grain size will likely play a vital role in adsorption-desorption of the majority trace metals to the reservoir lake. Other sediment parameters including the total averages were 5.9% (total organic matter (TOM)), 7...
April 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28251545/impact-of-tillage-practices-on-soil-bacterial-diversity-and-composition-under-the-tobacco-rice-rotation-in-china
#10
Yanping Lei, Yongliang Xiao, Lifeng Li, Chaoqiang Jiang, Chaolong Zu, Tian Li, Hui Cao
Tobacco-rice rotation is a common farming system in south China, and many tillage practices such as straw mulching, dolomite dust, and quicklime application have been adopted to improve crop production. These agricultural management practices alter soil physical and chemical properties and affect microbial life environment and community composition. In this research, six tillage practices including no tobacco and rice straw mulching (CK), tobacco and rice straw mulching (TrSr), rice straw returning fire (TrSc), tobacco and rice straw mulching with dolomite dust (TSD), rice straw returning fire and quicklime (TSQ), and rice straw returning fire, quicklime and reduced fertilizer (TSQf) were conducted to detect changes in soil bacterial diversity and composition using Illumina sequencing...
March 1, 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28249180/release-of-hydrogen-sulfide-during-microwave-pyrolysis-of-sewage-sludge-effect-of-operating-parameters-and-mechanism
#11
Jun Zhang, Wei Zuo, Yu Tian, Linlin Yin, Zhenlong Gong, Jie Zhang
The effects of sludge characteristics, pyrolysis temperature, heating rate and catalysts on the release of H2S and mechanism of H2S formation during sludge pyrolysis were investigated in a microwave heating reactor (MHR). The evolution of sulfur-containing compounds in the pyrolysis chars obtained at temperature range of 400-800°C was characterized by XPS. For a given temperature, the maximum concentration of H2S appeared at moisture content of 80%. Compared to the influence of heating rate on the H2S yields, pyrolysis temperature and catalyst played a more significant role on the release of H2S during microwave pyrolysis process...
February 23, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28224337/influence-of-ameliorating-soil-acidity-with-dolomite-on-the-priming-of-soil-c-content-and-co2-emission
#12
Muhammad Shaaban, Lei Wu, Qi-An Peng, Lukas van Zwieten, Muhammad Afzal Chhajro, Yupeng Wu, Shan Lin, Muhammad Mahmood Ahmed, Muhammad Salman Khalid, Muhammad Abid, Ronggui Hu
Lime or dolomite is commonly implemented to ameliorate soil acidity. However, the impact of dolomite on CO2 emissions from acidic soils is largely unknown. A 53-day laboratory study was carried out to investigate CO2 emissions by applying dolomite to an acidic Acrisol (rice-rapeseed rotation [RR soil]) and a Ferralsol (rice-fallow/flooded rotation [RF soil]). Dolomite was dosed at 0, 0.5, and 1.5 g 100 g(-1) soil, herein referred to as CK, L, and H, respectively. The soil pH(H2O) increased from 5.25 to 7...
February 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28204976/variation-in-whole-dna-methylation-in-red-maple-acer-rubrum-populations-from-a-mining-region-association-with-metal-contamination-and-cation-exchange-capacity-cec-in-podzolic-soils
#13
K N Kalubi, M Mehes-Smith, G Spiers, A Omri
Although a number of publications have provided convincing evidence that abiotic stresses such as drought and high salinity are involved in DNA methylation reports on the effects of metal contamination, pH, and cation exchange on DNA modifications are limited. The main objective of the present study is to determine the relationship between metal contamination and Cation exchange capacity (CEC) on whole DNA modifications. Metal analysis confirms that nickel and copper are the main contaminants in sampled sites within the Greater Sudbury Region (Ontario, Canada) and liming has increased soil pH significantly even after 30 years following dolomitic limestone applications...
April 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28165773/greenhouse-gas-emissions-from-a-cu-contaminated-soil-remediated-by-in-situ-stabilization-and-phytomanaged-by-a-mixed-stand-of-poplar-willows-and-false-indigo-bush
#14
M Šimek, D Elhottová, M Mench, L Giagnoni, P Nannipieri, G Renella
Phytomanagement of trace element-contaminated soils can reduce the soil toxicity and restore the soil ecological functions, including the soil gas exchange with the atmosphere. We studied the emission rate of the greenhouse gases (GHG) CO2, CH4 and N2O, and the potential CH4 oxidation, denitrification activity (DEA) and glucose mineralization of a Cu-contaminated soil amended with dolomitic limestone and compost, alone or in combination, after a 2 year-phytomanagement with a mixed stand of Populus nigra, Salix viminalis, S...
February 6, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28153810/characterization-of-ceramic-ware-fragments-from-aizanoi-turkey-by-micro-raman-xrpd-and-sem-edx-spectrometry
#15
Evin Caner, Bilge Alp Güney
Ceramic fragments from the antique city of Aizanoi, Turkey were investigated by micro Raman spectrometry in conjunction with XRPD and SEM-EDX analyses. Some basic physical characteristics of the ceramic samples were also investigated. Illite and muscovite were determined as the main clay types in the ceramic fragments. Clay used in the production of ceramic wares was found to be calcareous in most of the samples. No high temperature clay minerals were detected in the ceramics. All ceramic fragments were found to be rich in iron content...
April 15, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28110455/influence-of-environmental-and-anthropogenic-factors-at-the-bottom-sediments-in-a-doce-river-tributary-in-brazil
#16
Deyse Almeida Dos Reis, Aníbal da Fonseca Santiago, Laura Pereira Nascimento, Hubert Mathias Peter Roeser
In developing countries, it is uncommon to find watersheds that have been the object of detailed environmental studies. It makes the assessment of the magnitude of environmental impacts and pollution of these sites difficult. This research demonstrated ways to understand the dynamics of river bottom sediments contamination, even for watersheds with a lack of environmental data. Based on geochemical affinity, we conducted a comprehensive study on the concentration of metals and metalloids. Then, we discussed the probable origin of the concentration of these elements at the bottom sediment along the Matipó River...
January 22, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28063184/biologically-agglutinated-eukaryotic-microfossil-from-cryogenian-cap-carbonates
#17
K R Moore, T Bosak, F A Macdonald, D J G Lahr, S Newman, C Settens, S B Pruss
Cryogenian cap carbonates that overlie Sturtian glacial deposits were formed during a post-glacial transgression. Here, we describe microfossils from the Kakontwe Formation of Zambia and the Taishir Formation of Mongolia-both Cryogenian age, post-Sturtian cap carbonates-and investigate processes involved in their formation and preservation. We compare microfossils from these two localities to an assemblage of well-documented microfossils previously described in the post-Sturtian Rasthof Formation of Namibia...
January 6, 2017: Geobiology
https://www.readbyqxmd.com/read/28052072/microbial-response-to-soil-liming-of-damaged-ecosystems-revealed-by-pyrosequencing-and-phospholipid-fatty-acid-analyses
#18
Ramya Narendrula-Kotha, Kabwe K Nkongolo
AIMS: To assess the effects of dolomitic limestone applications on soil microbial communities' dynamics and bacterial and fungal biomass, relative abundance, and diversity in metal reclaimed regions. METHODS AND RESULTS: The study was conducted in reclaimed mining sites and metal uncontaminated areas. The limestone applications were performed over 35 years ago. Total microbial biomass was determined by Phospholipid fatty acids. Bacterial and fungal relative abundance and diversity were assessed using 454 pyrosequencing...
2017: PloS One
https://www.readbyqxmd.com/read/28034436/characteristics-of-change-in-water-quality-along-reclaimed-water-intake-area-of-the-chaobai-river-in-beijing-china
#19
Lei Yang, Jiangtao He, Yumei Liu, Jian Wang, Lie Jiang, Guangcai Wang
To reveal the basic characteristics and controlling factors of water quality change in the project Wenyu to Chaobai reclaimed water diversion, the water quality in the study area was monitored for one year at seven monitoring sites. Inverse geochemical models of the statistical groups were developed using PHREEQC to elucidate the hydrochemistry characteristics of reclaimed water and the factors. The monitoring results indicated that nitrogen and phosphorus contents were significantly reduced along the river mainly caused by seasonal and location variation...
December 2016: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/27960117/factors-controlling-groundwater-salinization-and-hydrogeochemical-processes-in-coastal-aquifers-from-southern-spain
#20
M Argamasilla, J A Barberá, B Andreo
In detrital coastal aquifers, seawater and surface water may interact with groundwater in multiple ways. Understanding the interference of water fluxes in this type of environment is essential to effectively manage the groundwater resources in water-stressed regions, such as the Mediterranean coastal fringe. In this research, the characterization of the main hydrogeochemical processes and the interaction between surface water and groundwater in the Marbella-Estepona coastal aquifers (southern Spain) have been carried out by means of the combined use of different hydrogeochemical indicators along with isotope data...
February 15, 2017: Science of the Total Environment
keyword
keyword
17090
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"