Bibliografie tematiche / Sodium dichromate

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Letteratura scientifica selezionata sul tema "Sodium dichromate"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 17 febbraio 2022

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Articoli di riviste sul tema "Sodium dichromate"

1

Sharma, Sangita, Kinnari H. Parikh, Mahesh V. Kadia, Falguni D. Thakkar e Dhara D. Patel. "Polarization Studies on Inhibitory Effect of Chromates and Dichromates on Corrosion of Tin Coated Steel in 0.5M Monochloroacetic Acid". E-Journal of Chemistry 5, n. 2 (2008): 302–8. http://dx.doi.org/10.1155/2008/658706.

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Chromates and Dichromates have been tested for its inhibitory effects towards tin coated steel in 0.5M monochloroacetic acid. The corrosion behaviour of potassium chromate, sodium chromate, potassium dichromate, sodium dichromate and ammonium dichromate was studied by polarization curves, Tafel parameters like Tafel slopes, extrapolation of cathodic Tafel line and intersection of cathodic and anodic line at open circuit potential in presence of inhibitors have been tabulated along with other electrochemical parameters and corrosion current have been calculated from Tafel lines. The efficiencies are calculated and compared reasonably well with those obtained from loss in weight data. All the inhibitors induce a significant increase of potential positive and direction accounts for cathodic polarization. The Icorrhas also been calculated and that accounts well for cathodic reactions in presence of chromates and dichromates as inhibitors.
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Young, Jay A. "Sodium Dichromate Dihydrate". Journal of Chemical Education 80, n. 11 (novembre 2003): 1251. http://dx.doi.org/10.1021/ed080p1251.

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Vacek, Václav, e Vladimír Rod. "Diffusion coefficients of potassium chromate and dichromate in water at 25 °C". Collection of Czechoslovak Chemical Communications 51, n. 7 (1986): 1403–6. http://dx.doi.org/10.1135/cccc19861403.

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Abstract (sommario):
The concentration dependences of diffusion coefficients of potassium chromate and dichromate in water at 25 °C were measured by using the Taylor technique of the concentration pulse dispersion in laminar flow of liquid. The results were compared with hitherto published mutually inconsistent data for potassium and sodium chromates and dichromates.
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4

Hfaiedh, Mbarka, Dalel Brahmi, Mohamed Nizar Zourgui e Lazhar Zourgui. "Phytochemical analysis and nephroprotective effect of cactus (Opuntia ficus-indica) cladodes on sodium dichromate-induced kidney injury in rats". Applied Physiology, Nutrition, and Metabolism 44, n. 3 (marzo 2019): 239–47. http://dx.doi.org/10.1139/apnm-2018-0184.

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Environmental and occupational exposure to chromium compounds, especially hexavalent chromium, is widely recognized as potentially nephrotoxic in humans and animals. The present study aimed to assess the efficacy of cactus (Opuntia ficus-indica) against sodium dichromate-induced nephrotoxicity, oxidative stress, and genotoxicity. Cactus cladodes extract (CCE) was phytochemically studied and tested in vitro for its potential antioxidant activities. Additionally, the preventive effect of CCE against sodium dichromate-induced renal dysfunction in a Wistar rat model (24 rats) was evaluated. For this purpose, CCE at a dose of 100 mg/kg was orally administered, followed by 10 mg/kg sodium dichromate (intraperitoneal injection). After 40 days of treatment, the rats were sacrificed, and the kidneys were excised for histological, lipid peroxidation, and antioxidant enzyme analyses. The phenol, flavonoid, tannin, ascorbic acid, and carotenoid contents of CCE were considered to be important. Our analyses showed that 1 mL of CCE was equivalent to 982.5 ± 1.79 μg of gallic acid, 294.37 ± 0.84 μg of rutin, 234.78 ± 0.24 μg of catechin, 204.34 ± 1.53 μg of ascorbic acid, and 3.14 ± 0.51 μg of β-carotene. In vivo, pretreatment with CCE was found to provide significant protection against sodium dichromate-induced nephrotoxicity by inhibiting lipid peroxidation, preserving normal antioxidant activities, and protecting renal tissues from lesions and DNA damage. The nephroprotective potential of CCE against sodium dichromate toxicity might be due to its antioxidant properties.
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Kim, Eun, e Ki Jung N.A. "Effect of sodium dichromate on carbohydrate metabolism". Toxicology and Applied Pharmacology 110, n. 2 (settembre 1991): 251–58. http://dx.doi.org/10.1016/s0041-008x(05)80007-9.

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Furlow, Bryant. "KBR appeals $85 million sodium dichromate verdict". Lancet Respiratory Medicine 1, n. 8 (ottobre 2013): 593. http://dx.doi.org/10.1016/s2213-2600(13)70180-2.

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Steinhoff, D., Sh C. Gad, G. K. Hatfield e U. Mohr. "Carcinogenicity study with sodium dichromate in rats". Experimental pathology 30, n. 3 (gennaio 1986): 129–41. http://dx.doi.org/10.1016/s0232-1513(86)80085-8.

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Antonijević, M. M., e N. V. Pacović. "Investigation of molybdenite oxidation by sodium dichromate". Minerals Engineering 5, n. 2 (gennaio 1992): 223–33. http://dx.doi.org/10.1016/0892-6875(92)90044-a.

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Cemeli, Eduard, Ricard Marcos e Diana Anderson. "Genotoxic and antigenotoxic properties of selenium compounds in thein vitromicronucleus assay with human whole blood lymphocytes and tk6 lymphoblastoid cells". Scientific World JOURNAL 6 (2006): 1202–10. http://dx.doi.org/10.1100/tsw.2006.204.

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Selenium is known to possess both genotoxic and antigenotoxic properties. In the present study, we have evaluated the genotoxicity and antigenotoxicity of three selenium compounds (sodium selenate, sodium selenite and selenous acid) by measuring in vitro micronucleus induction. Assays were conducted in whole blood lymphocytes and in the TK6 lymphoblastoid cell line, with and without co-treatment with potassium dichromate, a known genotoxic compound. In general, the compounds were more active in TK6 cells than they were in blood lymphocytes. Only 1 μM selenous acid increased the frequency of binucleated cells containing micronuclei (BNMN) in blood lymphocytes, while all three selenium compounds increased BNMN in TK6 cells. In addition, combinations of selenous acid and potassium dichromate resulted in lower frequencies of BNMN than potassium dichromate alone in blood lymphocytes, while combinations of sodium selenate and potassium dichromate produced lower frequencies of BNMN than potassium dichromate alone in TK6 cells. The concentrations of selenium compounds that were used, in combination with the medium components and the biological physiology of the whole blood lymphocytes and TK6 cells, could have affected the redox potential of the compounds, switching the chemicals from a pro-oxidant to antioxidant status and vice-versa. The lower activities of the compounds in blood lymphocytes may be due to the protective effects of blood components. The results indicate that the genotoxic and antigenotoxic properties of selenium compounds are highly dependent upon the conditions under which they are evaluated.
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Ke, Bao Lin, e Jian Hua Chen. "Research on the Role of Pre-Oxidation in the Separation of Cu-Pb in the Presence of Potassium Dichromate". Advanced Materials Research 402 (novembre 2011): 526–28. http://dx.doi.org/10.4028/www.scientific.net/amr.402.526.

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It is the most effective method to use potassium dichromate to separate copper from lead when galena is oxidized. However, it needs long time to oxidize galena by potassium dichromate. The efficiency of five oxidants on potassium dichromate depressing ability to galena have been studied completely in this paper, and results suggest that separation of Cu-Pb can be carried out effectively in short time in the presence of potassium dichromate when galena is pre-oxidized by oxidants. Sodium hypochlorite is the best oxidant, and after the interaction of 15 min., the grade and the recovery of copper concentrate are 24.02% and 81.93% respectively, and the grade and the recovery of lead concentrate are 17.88% and 84.98% respectively.
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Più fonti

Tesi sul tema "Sodium dichromate"

1

Silva, Djalma Ribeiro da. "Estudo de inibidores de corros?o em concreto armado, visando a melhoria na sua durabilidade". Universidade Federal do Rio Grande do Norte, 2007. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12869.

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Made available in DSpace on 2014-12-17T14:07:22Z (GMT). No. of bitstreams: 1 DjalmaRS.pdf: 1628891 bytes, checksum: d4993a3fdaeab8a1baca119c6780c3ac (MD5) Previous issue date: 2007-03-01
Petr?leo Brasileiro SA - PETROBRAS
This thesis has as objective presents a methodology to evaluate the behavior of the corrosion inhibitors sodium nitrite, sodium dichromate and sodium molybdate, as well as your mixture, the corrosion process for the built-in steel in the reinforced concrete, through different techniques electrochemical, as well as the mechanical properties of that concrete non conventional. The addition of the inhibitors was studied in the concrete in the proportions from 0.5 to 3.5 % regarding the cement mass, isolated or in the mixture, with concrete mixture proportions of 1.0:1.5:2.5 (cement, fine aggregate and coarse aggregate), superplasticizers 2.0 % and 0.40 water/cement ratio. In the modified concrete resistance rehearsals they were accomplished to the compression, consistence and the absorption of water, while to analyze the built-in steel in the concrete the rehearsals of polarization curves they were made. They were also execute, rehearsals of corrosion potential and polarization resistance with intention of diagnose the beginning of the corrosion of the armors inserted in body-of-proof submitted to an accelerated exhibition in immersion cycle and drying to the air. It was concluded, that among the studied inhibitors sodium nitrite , in the proportion of 2.0 % in relation to the mass of the cement, presented the best capacity of protection of the steel through all the studied techniques and that the methodology and the monitoring techniques used in this work, they were shown appropriate to evaluate the behavior and the efficiency of the inhibitors
Esta tese tem como objetivo apresentar uma metodologia para avaliar o comportamento dos inibidores de corros?o nitrito de s?dio, molibdato de s?dio, dicromato de s?dio, bem como a suas misturas, no processo de corros?o para o a?o embutido no concreto armado, atrav?s de diferentes t?cnicas eletroqu?micas, bem como as propriedades mec?nicas desse concreto n?o convencional. Estudou-se a adi??o dos inibidores no concreto nas propor??es de 0,5 a 3,5 % em rela??o ? massa do cimento, isolados e em mistura, num tra?o 1,0:1,5:2,5 (cimento, areia e brita), superplastificante 2,0 % e rela??o ?gua/cimento 0,40. No concreto modificado foram realizados ensaios de resist?ncia ? compress?o, consist?ncia e a absor??o de ?gua, enquanto que para analisar o a?o embutido no concreto foram efetuados ensaios de curvas de polariza??o. Foram executados tamb?m ensaios de potencial de corros?o e resist?ncia de polariza??o com intuito de diagnosticar o in?cio da corros?o das armaduras inseridas em corpos-de-prova submetidos a uma exposi??o acelerada em ciclo de imers?o e secagem ao ar. Concluiu-se que, dentre os inibidores estudados, o nitrito de s?dio, na propor??o de 2,0 % em rela??o ? massa do cimento, apresentou a melhor capacidade de prote??o do a?o atrav?s de todas as t?cnicas estudadas e que a metodologia e as t?cnicas de monitoramento utilizadas neste trabalho mostraram-se adequadas para avaliar o comportamento e a efici?ncia dos inibidores
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Mendes, Sandra Valéria Buratini. "Efeitos do meio de cultivo sobre a sobrevivência, reprodução e sensibilidade de Ceriodaphnia dubia". Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/18/18139/tde-08122016-111522/.

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A espécie Ceriodaphnia dubia tem sido amplamente utilizada em testes de toxicidade crônica. Como a água constitui um fator essencial à sua manutenção, procurou-se avaliar a influência de três tipos de meio no cultivo e na resposta toxicológica deste microcrustáceo a três substâncias de referência. Foram acompanhadas, durante 13 a 18 gerações, a sobrevivência e a reprodução dos organismos em água natural (Reservatório de Ribeirão do Piraí, município de Salto, São Paulo, Brasil) e em dois meios reconstituídos (um simples - água mole reconstituída acrescida de selênio - e um complexo, denominado MS), avaliando-se, a cada 4 ou 5 gerações, as condições e a sensibilidade de cada cultura em testes com cloreto de sódio, dicromato de potássio e fenol. Os resultados evidenciaram um desempenho similar nos meios reconstituídos (em que padrões mínimos para sobrevivência e fecundidade nem sempre foram atendidos) e diferenciado do obtido em água natural - a mais eficiente para manutenção das culturas, onde tais padrões foram, geralmente, superados. Constatou-se a similaridade entre organismos provenientes da água natural e do meio OMS. Observou-se, também que a variabilidade dos resultados do teste ecotoxicológico difere conforme a água de diluição e a substância química utilizada, permitindo reconhecer o NaCI como substância de referência mais apropriada à avaliação da precisão deste método de ensaio, cujo coeficiente de variação máximo aceitável poderia ser estabelecido em 35%.
The species Ceriodaphnia dubia has been widely used in chronic toxicity tests. As water represents as essential factor to its maintenance, as evaluation was made of the influence of three different media in the culture and toxicological response of this microcrustacean to three reference toxicants. Survival and reproduction of this organism, reared in natural water (from Ribeirão do Piraí Reservoir), São Paulo State, Brazil) and in two reconstituted media (a simple one - reconstituted soft water, supplemented with selenium - and a complex one, called MS), were accompanied during 13 to 18 generations; at each 4 or 5 generations such cultures were evaluated in relation to health and sensitivity in toxicity tests with sodium chloride, potassium dichromate and phenol. The results indicated a similar performance in the reconstituted media (where the minimum patterns for survival and fecundity were not always reached) and differentiated from that obtained in natural water - the most suitable culture medium, where such patterns were, usually, exceeded. It was found a comparable sensitivity between natural water and MS cultures. It was also verified that the variability of the results among ecotoxicological test differs according to dilution water and chemical substance, allowing to recognize NaCl as the most suitable reference toxicant to measure the precision of this test method, whose maximum coefficient of variation could be established in 35%.
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Hung, Chen-Hsiu, e 洪振修. "Transport Phenomena of Sodium Dichromate in Aqueous Solution with Ion Exchange Membrane Electrodialysis". Thesis, 1995. http://ndltd.ncl.edu.tw/handle/18959895148816388745.

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碩士
國立成功大學
化學工程研究所
83
The forms of Cr(VI) present in the aqueous solution are dependent on the total chromate concentration and solution pH. Within the Cr(VI) concentration range of 2 to 100 mM and pH range of 4.1 to 4.6,the predominant species are HCrO4- and Cr2 O72-. In this range of Cr(VI) concentration and pH,the transporrt behavior of Cr(VI) in the electrodialysis was studied both under constant voltage and under constant current. It was observed that the transport of HCrO4- and Cr2O72- throuth the electrodialysis is not Both the results obtained under constant voltage and under constant current showed that the increasing rate of the concentration of Cr(VI) in concentrate solution became slow with time when the initial concentration of Cr(VI) in dilute solution was below 10mM. However,the increasing rate of the concentration of Cr(VI) in concentrate solution increased with time when [Cr]>20mM. Furthermore,under constant voltage,the current of the system decreased with time when [Cr]<10mM,and the current efficiency increased as [Cr] increased.When [Cr]>20mM,the current of the system increased with time, and the current efficiency decreased first and then increased.Under constant current,the results showd that the applied voltage became greater and the current efficiency decreased with time when [Cr] was lower.
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Seepe, Alfred Hlabana. "Determination of chromic acid and sodium dichromate in a concentrated electrolytic solution with the aid of Artificial Neural Networks". Diss., 2009. http://hdl.handle.net/2263/29921.

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The aim of this work is to quantify the concentration of chromic acid (CA) in a saturated solution of chromium trioxide and sodium dichromate using Artificial Neural Networks (ANNs). A set of titration curves was obtained by automated acid-base titration according to a factorial experimental design that was developed for this purpose. These titration curves were divided into three subsets, a learning, training and test set for use by ANNs. Once trained, ANNs have the ability to recognize, generalize and relate the input to a particular output. Concentration of chromic acid (CA), total chromium(VI) and/or dichromate was used as the outputs and titration curves as the inputs to ANNs. Our aim here was to establish whether ANNs would be able to predict the concentration of chromic acid with an absolute error below 1%. For real world problem, the neural networks are only given the inputs and are expected to produce reasonable outputs corresponding to that inputs without any prior ‘knowledge’ about theory involved – here, no interpretation of titration curves was performed by ANNs. The test set of data that was not used for learning process, was used to validate the performance of the neural networks, to verify whether the ANNs learned the input-output patterns properly and how well trained ANNs were able to predict the concentrations of chromic acid, dichromate and total chromium. A number of ANNs models have been considered by varying the number of neurons in the hidden layer and parameters related to the learning process. It has been shown that ANNs can predict the concentration of chromic acid with required accuracy. A number of factors that affect the performance of the neural networks, such as the number of points in a titration curve, number of test points and their distribution within the training set, has been investigated. This work demonstrates that ANNs can be used for online monitoring of an electrolytic industrial process to manufacture chromic acid.
Dissertation (MSc)--University of Pretoria, 2009.
Chemistry
unrestricted
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Capitoli di libri sul tema "Sodium dichromate"

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Gooch, Jan W. "Sodium Dichromate". In Encyclopedic Dictionary of Polymers, 674. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_10828.

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Alford, R. E. "Cyclochrome—The Recycle of Sodium Dichromate in Sodium Chlorate Manufacture". In Modern Chlor-Alkali Technology, 43–57. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2880-3_5.

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Glaser, U., D. Hochrainer e H. Oldiges. "Investigations of the Lung Carcinogenic Potentials of Sodium Dichromate and Cr VI/III Oxide Aerosols in Wistar Rats". In Environmental Hygiene, 111–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73766-4_24.

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Okeniyi, Joshua Olusegun, Adebanji Samuel Ogbiye, Olubanke Olujoke Ogunlana, Elizabeth Toyin Okeniyi e Oluseyi Ebenezer Ogunlana. "InvestigatingSolanum AethiopicumLeaf-Extract and Sodium-Dichromate Effects on Steel-Rebar Corrosion Insaline/Marine Simulating-Environment: Implications on Sustainable Alternative for Environmentally-Hazardous Inhibitor". In Engineering Solutions for Sustainability, 167–75. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119179856.ch16.

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Okeniyi, Joshua Olusegun, Adebanji Samuel Ogbiye, Olubanke Olujoke Ogunlana, Elizabeth Toyin Okeniyi e Oluseyi Ebenezer Ogunlana. "Investigating Solanum Aethiopicum Leaf-Extract and Sodium-Dichromate Effects on Steel-Rebar Corrosion in Saline/Marine Simulating-Environment: Implications on Sustainable Alternative for Environmentally-Hazardous Inhibitor". In Engineering Solutions for Sustainability, 167–75. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48138-8_16.

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"Sodium dichromate". In Encyclopedic Dictionary of Polymers, 898. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-30160-0_10632.

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von Angerer, S. "With Sodium Dichromate or Sodium Periodate". In Ketones, 1. Georg Thieme Verlag KG, 2005. http://dx.doi.org/10.1055/sos-sd-026-00005.

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Figadère, B., e X. Franck. "With Potassium or Sodium Dichromate". In Three Carbon-Heteroatom Bonds: Acid Halides; Carboxylic Acids and Acid Salts, 1. Georg Thieme Verlag KG, 2007. http://dx.doi.org/10.1055/sos-sd-020-00153.

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Atti di convegni sul tema "Sodium dichromate"

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Akinwumi, Kazeem Akinyinka, Olabode Olatunbosun Osifeso, Olajumoke Jumoke Aboyewa e Oyeronke Aduni Odunola. "Abstract B21: Potassium dichromate and sodium arsenite toxicities: Modification by methanol extract of Rauvolfia vomitoria in albino mice". In Abstracts: AACR International Conference: New Frontiers in Cancer Research; January 18-22, 2017; Cape Town, South Africa. American Association for Cancer Research, 2017. http://dx.doi.org/10.1158/1538-7445.newfront17-b21.

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Rapporti di organizzazioni sul tema "Sodium dichromate"

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Carroll, Erica E. Pathology Report for Intraperitoneal Sodium Dichromate Exposure in Rats, Protocol No. 15-002-3. Fort Belvoir, VA: Defense Technical Information Center, dicembre 2015. http://dx.doi.org/10.21236/ad1006353.

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Sodium dichromate expedited response action assessment. Office of Scientific and Technical Information (OSTI), settembre 1993. http://dx.doi.org/10.2172/10191008.

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Sodium Dichromate Barrel Landfill expedited response action proposal. Office of Scientific and Technical Information (OSTI), settembre 1993. http://dx.doi.org/10.2172/10185085.

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