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Artigos de revistas sobre o tema "Metals analysis"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 1 de agosto de 2024

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1

Laurinaitis, Domas, e Aušra Zigmontienė. "RESEARCH ANALYSIS OF VERMICOMPOST INFLUENCE ON BIOACCUMULATION OF HEAVY METALS IN COMMON MEADOW-GRASS (POA PRATENSIS) / VERMIKOMPOSTO ĮTAKOS SUNKIŲJŲ METALŲ BIOAKUMULIACIJAI PIEVINĖJE MIGLĖJE (POA PRATENSIS) TYRIMŲ ANALIZĖ". Mokslas – Lietuvos ateitis 8, n.º 4 (24 de outubro de 2016): 376–81. http://dx.doi.org/10.3846/mla.2016.953.

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The more intensive growth of agricultural crops adding mineral fertilizers, environmental pollution make the soil degraded: reduce the fertility of soil, increase the concentration of heavy metals. Especially dangerous is a common, synergistic effect of heavy metals. Vermicompost optimizes pH, texture and organic material content – the soil indicators, which are the major contributors to migration of heavy metals in the soil and to the plants from it. In the article there is an investigation of vermicompost influence on bioaccumulation of heavy metals in common meadow-grass. After experimental research it is determined that immobilization of heavy metals was the best in soil-vermicompost substrate, prepared in a ratio 1:2. The cadmium (Cd) concentrations were lowest and the difference of HM content determined between roots and shoots was the most in biomass grown up in that mixture. In the underground part of plant the concentration equal to 11.10 mg/kg and in the part of above ground – 1.05 mg/kg. The situation of lead (Pb) and copper (Cu) is analogous. This is the optimal ratio of mixture preparation. Intensyvesnis žemės ūkio kultūrų auginimas, tręšiant mineralinėmis trąšomis, aplinkos tarša nualina dirvožemį: sumažėja dirvožemio derlingumas, didėja sunkiųjų metalų koncentracijos. Ypač pavojingas bendras, sinergetinis sunkiųjų metalų poveikis. Vermikompostas optimizuoja dirvožemio pH, granuliometrinę sudėtį, organinės medžiagos kiekį – rodiklius, nuo kurių labiausiai priklauso sunkiųjų metalų migracija dirvožemyje ir iš jo į augalus. Straipsnyje nagrinėjama vermikomposto įtaka sunkiųjų metalų bioakumuliacijai pievinėje miglėje. Atlikus eksperimentinį tyrimą nustatyta, kad geriausiai sunkiuosius metalus „surakino“ dirvožemio-vermikomposto substratas, paruoštas santykiu 1:2. Tame mišinyje užaugintoje biomasėje kadmio (Cd) koncentracijos buvo mažiausios, o skirtumas tarp SM kiekio nustatyto šaknyse ir ūgliuose didžiausias. Požeminėje augalo dalyje koncentracija lygi 11,10 mg/kg, o antžeminėje – 1,05 mg/kg. Švino (Pb) ir vario (Cu) atvejais situacija yra analogiška. Tai optimalus mišinio ruošimo santykis.

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2

Okochi, Haruno. "Chemical analysis of metals." Bulletin of the Japan Institute of Metals 26, n.º 7 (1987): 683–86. http://dx.doi.org/10.2320/materia1962.26.683.

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3

Moore, Glyn. "Analysis of precious metals". TrAC Trends in Analytical Chemistry 11, n.º 6 (junho de 1992): XVII—XVIII. http://dx.doi.org/10.1016/0165-9936(92)80052-8.

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4

Watkins, Clinton, e Michael McAleer. "Cointegration analysis of metals futures". Mathematics and Computers in Simulation 59, n.º 1-3 (maio de 2002): 207–21. http://dx.doi.org/10.1016/s0378-4754(01)00409-8.

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5

Oliveira Brett, Ana Maria, Christopher M. A. Brett, Frank-Michael Matysik e Silke Matysik. "Sonoelectrochemical analysis of trace metals". Ultrasonics Sonochemistry 4, n.º 2 (abril de 1997): 123–24. http://dx.doi.org/10.1016/s1350-4177(97)00015-1.

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6

Burkhanov, G. S. "Physicochemical analysis in metals science". Russian Journal of Inorganic Chemistry 55, n.º 11 (novembro de 2010): 1703–13. http://dx.doi.org/10.1134/s0036023610110082.

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7

Pridhvi Krishna, Gaddey, e Raja Sundararajan. "A REVIEW ON MULTI-ELEMENT ANALYSIS OF DIFFERENT SAMPLES BY ICP-OES". YMER Digital 21, n.º 06 (16 de junho de 2022): 461–83. http://dx.doi.org/10.37896/ymer21.06/45.

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Heavy metals over acceptable limits established by the world health organization can source complications to human beings and animal life in the environment. Several analytical approaches have been established to screen the air, water, food quality by tracing different heavy metal ions in samples. The review work begins with the introduction of pharmaceutical analysis, including metal's effect on the body and various instruments used in the heavy metal determination. The potential of ICP-OES to sense heavy metal ions was discussed. This review article provides an impression of the metals present in the environment and their detection through ICP-OES. In addition, recapitulates the body of work on heavy metal determination in the previous years using ICP-OES. The strengths and limitations of ICPOES have also been conversed. The review illustrates that ICP-OES has great prospective in heavy metal ion determination. Keywords: ICP-OES, Heavy elements, Multi-element determination, Plasma, Metals

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8

Akyuz, Burak, e Don McKay. "Quantitative Chemical Analysis of Metals in Failure Analysis". Journal of Failure Analysis and Prevention 22, n.º 1 (fevereiro de 2022): 108–12. http://dx.doi.org/10.1007/s11668-021-01327-z.

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9

Jones, Reese E., Jeremy A. Templeton, Gregory J. Wagner, David Olmsted e Nomand A. Modine. "Electron transport enhanced molecular dynamics for metals and semi-metals". International Journal for Numerical Methods in Engineering 83, n.º 8-9 (19 de março de 2010): 940–67. http://dx.doi.org/10.1002/nme.2857.

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10

Lugli, Francesco, e Claudio Fernando Mahler. "Phytoremediation of Metals: A Numerical Analysis". International Journal of Phytoremediation 17, n.º 3 (14 de novembro de 2014): 242–48. http://dx.doi.org/10.1080/15226514.2014.883495.

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11

Kilner, Cary. "Qualitative analysis of some transition metals". Journal of Chemical Education 62, n.º 1 (janeiro de 1985): 80. http://dx.doi.org/10.1021/ed062p80.

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12

Bennett, Gary F. "Environmental Sampling and Analysis for Metals". Journal of Hazardous Materials 98, n.º 1-3 (março de 2003): 322–23. http://dx.doi.org/10.1016/s0304-3894(02)00362-x.

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13

Wilner, Benjamin. "Stress analysis of particles in metals". Journal of the Mechanics and Physics of Solids 36, n.º 2 (janeiro de 1988): 141–65. http://dx.doi.org/10.1016/s0022-5096(98)90002-3.

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14

Moraw, Michal. "Analysis of outgassing characteristics of metals". Vacuum 36, n.º 7-9 (julho de 1986): 523–25. http://dx.doi.org/10.1016/0042-207x(86)90239-3.

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15

Tamames, Juan A. C., e Maria João Ramos. "Metals in proteins: cluster analysis studies". Journal of Molecular Modeling 17, n.º 3 (21 de maio de 2010): 429–42. http://dx.doi.org/10.1007/s00894-010-0733-5.

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16

van Veen, A., A. C. Kruseman, H. Schut, P. E. Mijnarends, B. J. Kooi e Jeff T. M. de Hosson. "Positron Analysis of Defects in Metals". Materials Science Forum 255-257 (setembro de 1997): 76–80. http://dx.doi.org/10.4028/www.scientific.net/msf.255-257.76.

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17

Guryanova, Lidiya, e Natalia Chernova. "Metals futures market: a comparative analysis of investment and arbitrage strategies". Development Management 17, n.º 4 (3 de março de 2020): 42–54. http://dx.doi.org/10.21511/dm.17(4).2019.04.

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The article deals with the application of optimal portfolio theory and pair trading theory on the metals futures market. Advantages of the futures market over the spot market include relatively small initial price, low transaction costs, and high volatility. The main aim of the study is to explore the potential of both strategies for effective trading. The following financial instruments were chosen as the inputs of the models: futures on industrial metals (aluminum, copper, nickel, zinc, lead, tin), futures on precious metals (gold and silver). When building the optimal portfolio, it was decided to include Dow Jones Index futures and S&amp;P Index futures among metals. This is because these instruments are extremely volatile and may play the role of a hedge in the portfolio. A drawdown indicator was used to assess the effectiveness of each strategy. The results show that both strategies can be applied on the real-life market. The final choice will depend on the level of risk taking by investors and the desired value of return.

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18

Wang, Juan, Xuejing Wang, Guoxue Li, Jingtao Ding, Yujun Shen, Di Liu, Hongsheng Cheng, Ying Zhang e Ran Li. "Speciation Analysis Method of Heavy Metals in Organic Fertilizers: A Review". Sustainability 14, n.º 24 (14 de dezembro de 2022): 16789. http://dx.doi.org/10.3390/su142416789.

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Heavy metals in organic fertilizers pose a risk to the agricultural ecosystem. The environmental risk of heavy metals depends not only on the total amount but also on the speciation. Hence, more information on heavy metals speciation in organic fertilizers is needed to avoid adverse effect. At present, the speciation information of heavy metals is usually obtained by the single-extraction method and sequential extraction method. Common heavy metals that have received attention include Cu, Zn, Pb, Cd, Cr, Hg and As. There is a lack of reviews on speciation analysis methods for heavy metals, specifically in organic fertilizers. This work aims to comprehensively review the methods, explore the problems of the sequence extraction procedure and summarize the factors affecting the distribution of heavy metals speciation. Each sequence extraction procedure of heavy metals in organic fertilizers is described in detail, and the affecting factors are proposed. The review could contribute proposing the directions of optimizing the sequence extraction procedure of heavy metals in organic fertilizers in the future.

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19

Liu, Jing, Ye Qiu e Jian Wang. "Analysis of Heavy Metals in Paper-Process Reconstituted Tobacco". Advanced Materials Research 396-398 (novembro de 2011): 1692–95. http://dx.doi.org/10.4028/www.scientific.net/amr.396-398.1692.

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In this paper, content of heavy metals such as mercury, lead, cadmium and arsenic in tobacco leaves, tobacco stems, imported and domestic RT was compared, it was found that content of heavy metals in tobacco leaves was higher than that in RT and tobacco stems; compared with the imported RT, the content of heavy metals in domestic products was higher, especially the content of cadmium was significantly high. The soil was the main source of heavy metals in RT, so strengthening inspection and monitor of soil was necessary and important.

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20

Vaišis, Vaidotas, e Lidija Šuksta. "EXPERIMENTAL ANALYSIS OF IRON IMPACT ON HEAVY METAL (COPPER) MIGRATION IN THE SOIL". JOURNAL OF ENVIRONMENTAL ENGINEERING AND LANDSCAPE MANAGEMENT 18, n.º 4 (31 de dezembro de 2010): 306–11. http://dx.doi.org/10.3846/jeelm.2010.35.

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The paper focusses on analysis of the impact of iron particles on heavy metals migration in the soil within the northern area of Klaipeda city. The city has been chosen due to its function as a transit harbour locating 19 big companies related to the sea business and cargo services. Like every ecosystem, the soil is characterized by accumulating different substances with no exclusion of contaminants. For the analysis of iron impact on heavy metals migration, an experimental stand with six fixed columns was constructed. Copper salt solution was passed through the columns on quartz sand with iron filings (1.5 and 10%) in it and without (the control column). Quartz sand was chosen due to its inert properties. The analysis proves that iron forms a geochemical barrier and it has significant impact on the mode of the heavy metal (Cu) migration in the soil. Santrauka Straipsnyje analizuojama geležies daleliu itaka sunkiuju metalu migravimui šiaurineje Klaipedos uosto dalyje. Klaipeda pasirinkta, nes tai tranzitinis uostas, kuriame vyksta kroviniu krovimas, laivu statyba, rekonstravimas ir visos kitos funkcijos, susijusios su jūrine veikla ir krovininiu laivu paslaugomis. Kaip ir kiekvienoje ekosistemoje dirvožemiams būdingos akumuliacines savybes, juose kaupiasi ivairios medžiagos, kartu – ir teršalai. Geležies itakai sunkiuju metalu migravimui tirti buvo sukonstruotas specialus eksperimentinis stendas su šešiomis kolonomis, pro kurias per tiriama terpe – kvarcini smeli (nes jis yra inertiškas) buvo leidžiamas vario druskos tirpalas. Eksperimente naudotas kvarcinis smelis su geležies drožlemis (1, 5 ir 10 %) ir be ju (kontrolinis). Iš analizes rezultatu akivaizdu, kad geležis turi reikšminga itaka sunkiojo metalo (Cu) migracijos pobūdžiui dirvožemyje bei sukuria geochemini barjera. Резюме Клайпеда – крупный транзитный порт, в котором погрузкой грузов, строительством кораблей и их реконструкцией, а также всеми остальными функциями, касающимися морской деятельности и услуг грузоподъемных кораблей, занимаются 19 больших компаний. Как и каждая экосистема, почва функционирует как накопитель и резервуар материалов, включая и загрязняющие вещества. В статье главное внимание уделено исследованию частиц железа, оказывающих влияние на миграцию тяжелых металлов в северной части города Клайпеды около Клайпедского порта. С этой целью была сконструирована специальная доска с шестью колоннами, через которые в анализируемую среду – кварцевый песок (инертный материал) – пропускался раствор. Для эксперимента был выбран кварцевый песок со стружками железа (1, 5 и 10%) и без него. Результаты анализа показали, что железо оказывает значительное влияние на формы миграции тяжелого металла (меди), а также создает геохимический барьер.

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21

Agbugui, Marian, e Grace Abe. "Analysis of Trace Metal Bioaccumulation in Fish and Man; Health Risk Impact". International Journal of Fisheries and Aquaculture Research 9, n.º 1 (15 de janeiro de 2023): 32–59. http://dx.doi.org/10.37745/ijfar.15/vol9n13259.

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Trace metals occur during natural processes and are also obtained during anthropogenic activities. Streams, lakes and rivers surrounded by farmlands engaged in the use of Trace metal-enriched fertilizers have shown a possible and positive correlation to the rise of Trace metals in the use of chemical, organic and water-soluble fertilizers for a long period. there is a tendency for high correlations of trace metals in source waters. Furthermore, the increasing level of trace metals in fish is alarming and has spurred scientists to make research on the dangers caused by the trace metals resulting in trace metal accumulation and bioaccumulation of life cells. This study aims at assessing the possible sources of trace metals in the aquatic environment, the impact of Trace metals in the aquatic environment, their bioaccumulation in fish and human health risk impact, negative effects in fish have been attributed to the accumulation of trace metals such as irritation of the gastrointestinal mucosa, nephritis, necrosis, neurological and behavioural disorders and death amongst others). The ingestion, absorption and uptake of trace metals in fish are usually toxic and result in harmful damage to the fish and fish life. Since most of the metals taken up are non-biodegradable, such metals can bioaccumulate and bio-magnify. Over time, the accumulated metals affect the growth and development stages of fish from the production of viable eggs, hatchability laval, fingerlings and juvenile life stages. This is so because the early life stages are more sensitive than during maturing and adulthood. In conclusion, negative results of the presence of trace metals and the effect of bioaccumulation and bio-magnification have been reviewed in this paper. This study recommends that the proper assessment and treatment of all forms of wastewater, agricultural waste, sewage, and industrial effluents be carried out before their discharge into the environment.

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22

Kuusela, Maija. "Optimal die design for work-hardening metals". Journal of Mathematical Analysis and Applications 117, n.º 2 (agosto de 1986): 411–27. http://dx.doi.org/10.1016/0022-247x(86)90232-5.

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23

Казаков, Алексей Васильевич, Роман Александрович Емельянов, Дмитрий Викторович Бухтояров e Денис Владимирович Полтавец. "ANALYSIS OF MODERN TECHNOLOGIES FOR EXTINGUISHING ACTIVE METALS". Pozharnaia bezopasnost`, n.º 4(109) (16 de dezembro de 2022): 29–35. http://dx.doi.org/10.37657/vniipo.pb.2022.109.4.002.

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Проведен анализ огнетушащих составов, применяемых для тушения активных металлов (пожары класса D). Отмечено, что основные современные средства обеспечения пожаротушения представляют собой галогенсодержащие соли (фториды или хлориды щелочных и щелочно-земельных металлов), препятствующие доступу кислорода без ингибирующего эффекта по отношению к самому горящему металлу. При этом данные солевые композиции не лишены недостатков из-за их высокой гигроскопичности (содержания кристаллизационной воды), что усложняет тушение. Ввиду последнего разработка более эффективных огнетушащих составов для тушения активных металлов является достаточно актуальной и перспективной. Ignition of active metals and their alloys often results in significant material damage. This determines the relevance for development of means to eliminate the possibility of ignition of metals and their alloys in zones of their most likely occurrence - during their melting and refining in metallurgical processes, in the technological processes of their processing and manufacturing of products by enterprises of various industries. For these purposes it is necessary to equip both consumers and special fire departments with highly effective means to ensure fire safety. Burning of active metals is characterized by a very rapid development of the oxidation reaction in the air due to their high reactivity. At the same time, for example, in a D1 class fire (burning of light metals except alkaline), the upper temperature threshold can reach 3000 °C. Alkaline and alkaline-earth metals are able to sustain combustion with limited air oxygen or contact with nitrogen or oxygen-containing substances. Extinguishing metals and their compounds differs from extinguishing fires of other classes. The main extinguishing agent used at protection facilities is a special purpose extinguishing powder. Class D fire extinguishing with a special purpose extinguishing powder consists in creating a protective layer on the burning surface. The use of calming nozzles practically prevents the formation of the air suspension when applying a fire extinguishing agent to burning area. Thus, the principle of extinguishing metals with powder extinguishing agents is to isolate and interrupt the chain reaction of burning. Despite the sufficient effectiveness of the powder compositions used, there was also identified a number of significant drawbacks in the work: a large consumption of extinguishing agent, the difficulty of supplying extinguishing agent to the hearth due to high temperature, the high cost of special extinguishing powders of a new generation, etc. As a matter of fact, it is concluded that the search for more effective means of extinguishing fires of metals and their alloys is relevant and promising, with the absence of these shortcomings.

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Song, Guang Sheng, Shi Hong Zhang, Ming Cheng e Bin Wang. "Analysis on the Twinning of FCC Metals by EBSD". Advanced Materials Research 472-475 (fevereiro de 2012): 700–706. http://dx.doi.org/10.4028/www.scientific.net/amr.472-475.700.

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For the technology of EBSD, the twinning of metals was described in the form of rotation angle combined with rotation axis, while the twinning of metals was usually described in the form of twinning plane combined with twinning direction. In this report, the corresponding relationship between the two description forms of twinning of face-centered cubic (FCC) metals has been built, based on this relationship, the twinning plane and twinning direction of FCC metals can be determined by EBSD. As the practical application of this relationship above, the twinning variants of two kinds of Ni based superalloys were analyzed.

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Girin, Oleg. "ELECTROCHEMICAL POLYMORPHIC PHASE FORMATION IN METALS". Acta Metallurgica Slovaca 27, n.º 3 (13 de setembro de 2021): 139–45. http://dx.doi.org/10.36547/ams.27.3.1011.

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The phenomenon of electrochemical phase formation in metals and alloys via a supercooled liquid state stage was discussed. Assuming the electrodeposited metal to be a product of formation and ultrarapid solidification of supercooled metallic liquid, a possibility of metastable phase formation during electrodeposition of polymorphous metals was suggested. It was anticipated that the polymorphic transition of the metal’s metastable form to the stable one occurs by shear, as does the martensitic transformation. To enable revealing an orientation relationship between grains of the two phases, a method for X-ray texture analysis of metals was developed using a combination of direct pole figures. It was established that the phase formation during electrodeposition of polymorphous metals produces metastable modifications typical of entities that crystallized from a liquid state at extremely high rates. In regards polymorphic transitions in metal electrodeposition, certain orientation relationships were observed between grains of the stable and the metastable phase, which is typical of phase transformations proceeding at extremely high rates. The results obtained provided additional arguments in favor of the phenomenon under discussion.

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Alexandrov, Igor V., e Ruslan Valiev. "X-Ray Analysis of Bulk Nanostructured Metals". Materials Science Forum 321-324 (janeiro de 2000): 577–82. http://dx.doi.org/10.4028/www.scientific.net/msf.321-324.577.

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Zaoui, A., Andrzej Korbel, P. Dubois e C. Rey. "Bifurcation Analysis of Shear Banding in Metals". Solid State Phenomena 3-4 (janeiro de 1991): 433–46. http://dx.doi.org/10.4028/www.scientific.net/ssp.3-4.433.

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Shigabaeva, G. N., e E. O. Akhtyrskaya. "Correlation analysis of heavy metals in sediments". Izvestiya MGTU MAMI 8, n.º 2-3 (20 de maio de 2014): 55–59. http://dx.doi.org/10.17816/2074-0530-67561.

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This paper presents the results of chemical analysis of lakes sediments in the taiga zone of Western Siberia. The total content and mobile forms of heavy metals are determined, correlation diagram for the heavy metal content is made, Clarke concentrations are calculated. There is constructed a matrix of pair correlations using the program Statistika 6.0.

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29

Seymour, Richard. "Platinum Group Metals Patent Analysis and Mapping". Platinum Metals Review 52, n.º 4 (1 de outubro de 2008): 231–40. http://dx.doi.org/10.1595/147106708x362735.

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Sharma, Manu, Esha Prashar, Rajnish Aggarwal e Gauravdeep Kaur. "Gold and Precious Metals: A Comparative Analysis". Journal of Private Equity 16, n.º 4 (31 de agosto de 2013): 93–97. http://dx.doi.org/10.3905/jpe.2013.16.4.093.

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Jurado-Lopez, Alicia, e Maria Luque de Castro. "X-Ray Fluorescence Analysis of Valuable Metals". Current Analytical Chemistry 2, n.º 3 (1 de julho de 2006): 271–77. http://dx.doi.org/10.2174/157341106777698215.

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Fairman, Ben, Michael W. Hinds, Simon M. Nelms, Denise M. Penny e Phill Goodall. "Industrial analysis: metals, chemicals and advanced materials". Journal of Analytical Atomic Spectrometry 15, n.º 12 (2000): 1606–31. http://dx.doi.org/10.1039/b007460h.

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Fairman, Ben, Michael W. Hinds, Simon M. Nelms, Denise M. Penny e Phill Goodall. "Industrial analysis: metals, chemicals and advanced materials". Journal of Analytical Atomic Spectrometry 14, n.º 12 (1999): 1937–69. http://dx.doi.org/10.1039/a908094e.

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MCINTYRE, N. S., R. D. DAVIDSON, P. A. W. VAN DER HEIDE e S. RAMAMURTHY. "IMPROVEMENT OF METALS TECHNOLOGIES THROUGH SURFACE ANALYSIS". Surface Review and Letters 02, n.º 05 (outubro de 1995): 667–87. http://dx.doi.org/10.1142/s0218625x95000601.

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