scholarly journals Evaluation of the Chemical Composition of Coatings Present on AWS A5.1 E6013 Welding Electrodes

2021 ◽  
Vol 26 ◽  
Author(s):  
Bruno Luiz Mendes Fernandes ◽  
Taimara Polidoro Ferreira ◽  
Rafael Arromba de Sousa ◽  
Walter dos Reis Pedreira Filho ◽  
Denise Lowinsohn
Keyword(s):  
Chemical Composition ◽  
Icp Ms

Resumo: Os eletrodos AWS A5.1 E6013 possuem elevado interesse devido a sua ampla empregabilidade. Os revestimentos destes eletrodos podem alterar os resultados da soldagem, tornando-se um interessante objeto de estudo. Uma investigação da composição química dos revestimentos dos eletrodos AWS A5.1 E6013 de quatro fabricantes brasileiros foi realizada usando espectrometria de fluorescência de raios-X por energia dispersiva (FRXED), microscopia eletrônica de varredura (MEV) e espectrometria de massa com plasma indutivamente acoplado (ICP-MS). Foram observados nas amostras compostos tais como o dióxido de titânio (TiO2), óxidos e carbonatos de metais alcalinos e alcalino-terrosos, além de Al e Si na forma de aluminosilicatos. Estes compostos auxiliam na extrusão do revestimento na etapa de fabricação do eletrodo, elevam a basicidade da escória e estabilizam o arco elétrico formado durante a soldagem. Os resultados do ICP-MS mostraram que elementos como Co, Cr, Cu e Ni são adicionados para aumentar a passividade e a resistência mecânica da junta soldada. Resíduos de Pb foram observados com teores até 700 vezes maior que o permitido pela legislação nacional. As presenças destes metais nos revestimentos evidenciam a necessidade de medidas protetivas ao manipular os eletrodos E6013.

scholarly journals MINERAL CHEMISTRY AND GEOCHEMISTRY OF HYPERSTHENE-BEARING DIORITE FROM ERUSU AKOKO, SOUTHWESTERN NIGERIA

2020 ◽  
Vol 4 (1) ◽  
pp. 13-18
Author(s):  
E. J. Oziegbe ◽  
V. O. Olarewaju ◽  
O. O. Ocan
Keyword(s):  
Chemical Composition ◽  
Chemical Properties ◽  
Mineral Chemistry ◽  
Accessory Mineral ◽  
Southwestern Nigeria ◽  
Hydrous Minerals ◽  
Icp Ms ◽  
Composition Of Minerals ◽  
Textural Relationship ◽  
Opaque Minerals

Samples of mafic intrusive rock were analyzed for their mineralogical and chemical properties. The textural relationship was studied using the petrographic microscope, elemental composition of minerals was determined using the Electron Microprobe and the whole rock chemical analysis was done using the XRF and ICP-MS. The following minerals were observed in order of abundance; pyroxene, amphibole, plagioclase, biotite, opaque minerals, quartz and chlorite, with apatite and zircon occurring as accessory mineral. Two types of pyroxenes were observed; orthopyroxene (hypersthene) and clinopyroxene. Texturally, amphiboles have inclusions of plagioclase and pyroxene. The plagioclase has undergone sericitization. The chemical composition of the pyroxene is En51.95Fs44.53Wo3.52, biotite has Fe/(Fe+Mg):0.42, Mg/(Fe+Mg):0.59, and plagioclase is Ab63.5An34.55Or1.95. Whole rock chemistry shows a chemical composition; SiO2: 45.15 %, Al2O3: 14.04 %, Fe2O3: 16.01 %, MgO: 5.65 %, CaO: 7.58 % and TiO2: 3.59 %. There is an enrichment of LREE and a depletion of HREE. Based on the minerals, mineral chemistry and the geochemistry of the studied rock, the rock is mafic and hydrous minerals formed by hydration recrystallization of pyroxene. The rock has extensively retrogressed but has not been affected by any form of deformation.

Trace elements and Pb isotope composition of annual tree rings and pine needles growing in highly industrialized region in southern Poland

2021 ◽  
Author(s):  
Barbara Sensuła ◽  
Nathalie Fagel
Keyword(s):  
Trace Elements ◽  
Chemical Composition ◽  
Tree Rings ◽  
Wet Deposition ◽  
Isotope Ratio ◽  
Isotope Composition ◽  
Pine Needles ◽  
Pb Isotope ◽  
Southern Poland ◽  
Icp Ms

<p>Trees can provide annual records of ecosystem changes connected with human activity over several decades. These changes can be recorded in the pattern of variation of tree-rings widths and in the variation in the elemental composition of wood. Analysis of trace metal pollution is based on the assumption that element concentrations in tree foliage and tree rings represent element availability in the environment.</p><p>We determined the chemical composition of pine needles and annual tree rings to monitor environmental contamination in an urban forest environment in the most industrialized part of southern Poland.</p><p>The concentrations of trace elements (Cr, Co, Ni, Cu, Zn, Pb) and the Pb isotope composition were measured in needles from Pinus sylvestris L. growing in nine urban forests near five factories. Trace elemental concentration and Pb isotope ratio were determined by ICP-MS and MC-ICP-MS, respectively. The needles were characterized based on the concentrations of Cr, ranging from 0.05 to 0.7 mg/kg, Co, from 0.005 to 0.075 mg/kg, Ni, from 0.12 to 0.66 mg/kg, Cu, from 0.49 to 1.0 mg/kg, Zn, from 3.9 to 14 mg/kg, and Pb, from 0.06 to 0.53 mg/kg. The <sup>208</sup>Pb/<sup>206</sup>Pb ratio ranged from 2.08 to 2.11 and the <sup>206</sup>Pb/<sup>207</sup>Pb ratio between 1.15 and 1.17. The heterogeneity of Pb isotope ratio indicates that there are different sources affecting the Pb isotopic composition of pine needles (Sensuła et al., 2021).</p><p>In one of the investigated site, a radial trace-element profiles were determined by Laser Ablation Inductively Coupled Plasma-Mass Spectrometry (Laser ablation: New Wave Research UP-193 FX Fast Excimer, ICP-MS: Thermo Scientific X-Series2 with CCT -Collision Cell Technology) at Royal Museum for Central Africa (Belgium). LA-ICP-MS provides a repeatable, minimally destructive, sensitive method for determining many elements in wood tissue, with relatively high spatial resolution.Temporal variations of element concentration (median) in annual tree-rings of pines were compared with time series of wet deposition of pollutant and air pollutant concentration in the investigated area. The similar trends of magnitudes changes can be observed between analysed elements concentration (Na, Mg, Fe, Ni, Zn) and total wet deposition of these elements in the environment during vegetation period or these elements concentration in the rain (Sensuła et al. 2017). </p><p>Different space-time patterns of element accumulation in pine needles and annaul tree rings were observed. The variation in isotopic composition reflects a mix between different anthropogenic sources.</p><p> </p><p>References:</p><p>Sensuła, B., Wilczyński, S., Monin, L., Allan, M., Pazdur, A., & Fagel, N. (2017). Variations of tree ring width and chemical composition of wood of pine growing in the area nearby chemical factories, Geochronometria, 44(1), 226-239. doi: https://doi.org/10.1515/geochr-2015-0064</p><p>Sensuła, B., Fagel, N., & Michczyński, A. (2021). Radiocarbon, trace elements and pb isotope composition of pine needles from a highly industrialized region in southern Poland. Radiocarbon, 1-14. doi:10.1017/RDC.2020.132</p>

scholarly journals GLASS FINDS FROM THE EARLY MEDIEVAL CEMETERIES IN THE MOUNTAINOUS AREAS OF THE NORTH CAUCASUS CENTRAL REGIONS: CHEMICAL COMPOSITION AND ORIGIN

2019 ◽  
Author(s):  
О.С. Румянцева ◽  
А.А. Кадиева ◽  
С.В. Демиденко ◽  
Д.А. Ханин ◽  
М.В. Червяковская ◽  
...  
Keyword(s):  
Roman Empire ◽  
Chemical Composition ◽  
Mountainous Areas ◽  
North Caucasus ◽  
Early Medieval ◽  
The North ◽  
Icp Ms ◽  
Central Regions ◽  
Plant Ash ◽  
Different Origin

В статье рассмотрен химический состав серии стеклянных изделий, происходящих из раннесредневековых могильников центральных районов Северного Кавказа (втор. пол. V VIII в.). Стекло проанализировано методами SEM EDS, EPMA, LA ICP MS. Стекло одного из украшений изготовлено на золе растений и происхождением связано с регионом к востоку от Евфрата (возможно, с сасанидским Ираном) остальные стекла содовые и происходят, вероятно, из Восточного и Юго Восточного Средиземноморья. По составу они находят соответствие среди групп, распространенных на территории Римской империи как в синхронное, так и в более раннее время (HIMT, группы Foy 3.2 Foy 4, Левантийская 1, римское зеленоголубое). Некоторые признаки химического состава позволяют говорить о случайном характере сырья, использовавшегося при изготовлении вставок, и/или о разном происхождении самих украшений со вставками. The paper explores the chemical composition of a series of glass items originating from the early medieval cemeteries discovered in the North Caucasus central regions (second half of the 5th 8th centuries). The glass was analyzed by SEM EDS, EPMA, LA ICP MS methods. The glass of one item was made of plant ash glass, originated from a region east of the Euphrates (possibly, Sasanian Iran) other items were made from soda glass and, most likely, came from the Eastern and Southeastern Mediterranean. Their composition is similar to the glass of the groups well known in the Roman Empire during the same period and earlier (HIMT, Foy 3.2 Foy 4, Roman bluegreen, Levantine I groups). Some aspects of the chemical composition suggest that the the accidental choice of the glass used in making inserts and/or about different origin of the items with inserts.

scholarly journals Determination of the chemical composition of medieval glazed pottery from Drastar (Bulgaria) using PIXE/PIGE and LA-ICP-MS

2017 ◽  
pp. 69-82 ◽  
Author(s):  
Valentina Lyubomirova ◽  
Žiga Šmit ◽  
Helena Fajfar ◽  
Ivelin Kuleff
Keyword(s):  
Chemical Composition ◽  
Icp Ms

scholarly journals Ash Characteristics and Selected Critical Elements (Ga, Sc, V) in Coal and Ash in Polish Deposits

Resources ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 115
Author(s):  
Barbara Bielowicz
Keyword(s):  
Chemical Composition ◽  
Bituminous Coal ◽  
Raw Materials ◽  
Coal Ash ◽  
Proximate Analysis ◽  
Petrographic Composition ◽  
Critical Elements ◽  
Icp Ms ◽  
Coal Ashes ◽  
The Relationship

The chemical composition of coal ash and the content of the critical elements Ga, Sc, and V in coal and ash are examined herein. In this study, lignite and bituminous coal from Polish deposits were used. The coals were subjected to ultimate and proximate analysis; the petrographic composition was determined based on maceral groups. The chemical composition of ash and the content of critical elements were determined using ICP-MS. The obtained results were correlated and Pearson’s linear correlation coefficient was determined. Based on the correlation analysis, the relationship between the chemical composition of ash and the proximate and ultimate analyses was demonstrated. The content of selected critical elements in the tested deposits was lower than the Clarke value in coal. However, in some deposits these contents are much higher in coal ashes. The higher levels of Ga, V, and Sc in the ash are associated with Al2O3. Therefore, it can be stated that ashes can be a potential source of some raw materials. The highest concentrations of critical elements in coal and ash were recorded in the Lublin Coal Basin. Supra-Clarke contents of Ga, V, and Sc were recorded in the Bogdanka coal mine.

scholarly journals Nutritional Composition and Mineral Elements Content Analyses of Lonicera fulvotomentosa Hsu et S. C. Cheng Grown in China

2021 ◽  
Author(s):  
Xianghui Jiang ◽  
Longqian Xiao
Keyword(s):  
Chemical Composition ◽  
Caffeic Acid ◽  
Inductively Coupled Plasma ◽  
Crude Protein ◽  
Mineral Elements ◽  
Nutritional Composition ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Karst Landform ◽  
Candidate Molecule

Abstract Lonicera fulvotomentosa Hsu et S. C. Cheng (L. fulvotomentosa), a vine shrub found in Southwestern China, is used for treating epidemic fever and infectious diseases, such as SARS and Avian Influenza. Here, we investigated the chemical composition and nutritional content of dried flowers of L. fulvotomentosa grown in yellow loam and Karst landform soil in Guizhou, China. The moisture content in all samples varied from 3.25 to 3.63%, lipids from 7.76 to 9.93%, fiber from 6.93 to 7.34%, ashes from 12.32 to 12.76%, crude protein from 7.85 to 8.53%, and carbohydrates from 56.21 to 59.77%. Using inductively coupled plasma-mass spectroscopy (ICP-MS), the predominant mineral elements in the dried flowers were found to be calcium (297.34-351.26 mg/kg), potassium (132.56-140.37 mg/kg), iron (37.77–41.25 mg/kg), and magnesium (9.47–11.36 mg/kg). Also, HPLC identified flavonoids (kaempferol, rutin, quercetin, luteolin, and apigenin) and phenolic acids (caffeic acid, gallic acid, and chlorogenic acid). Thus, the chemical composition of L. fulvotomentosa was similar to that of Lonicera japonica Thunb. (L. japonica). Thus, it could be used as an alternative to L. japonica. Our results showed that the dried flower of L. fulvotomentosa had an extremely high content of chlorogenic acids and caffeic acid, which could be developed as a candidate molecule as HIV inhibitors.

Chemical Composition Assessment of Sulphurous Waters

2018 ◽  
Vol 69 (5) ◽  
pp. 1037-1040
Author(s):  
Ovidiu Murarescu ◽  
Gica Pehoiu ◽  
Cristiana Radulescu ◽  
Ioana Daniela Dulama ◽  
Sofia Teodorescu ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Dissolved Oxygen ◽  
Mass Spectroscopy ◽  
Water Samples ◽  
Inductively Coupled Plasma ◽  
Physicochemical Parameters ◽  
Total Hardness ◽  
Summer Period ◽  
Inductively Coupled ◽  
Icp Ms

The study aims to assess the chemical composition of sulphurous spring waters collected from Pucioasa � Vulcana Bai balneotherapeutical area, Dambovita County. The sampling were achieved from active and preserved sulphurous sources (i.e. five springs), during the summer period of the year 2016. The content of nine metals (i.e. Cr, Mn, Fe, Co, Ni, Cu, Cd, Zn, and Pb) in water samples was determined by Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS). The relationships between physicochemical parameters (i.e. pH, conductivity, TDS, salinity, total hardness and dissolved oxygen) and metal concentrations were investigated, as well.

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