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Dissertations / Theses on the topic 'Sulphite ion'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Kaputo, M. T. "Reaction of melanoidins with sulphite ion." Thesis, University of Leeds, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382876.

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2

Cartwright, John Alexander. "Study of the leaching of polymetallic sulphide ores using ion selective membranes." Thesis, Queensland University of Technology, 1998.

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3

Sui, Chihyu Caroline. "Metal ion transfer between sulphide minerals and effect on xanthate interaction with pyrite." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40263.

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Metal ion production by minerals alone and in pairs was studied by solution analysis, extraction with ethylene diamine tetraacetate (EDTA) and laser ion mass spectroscopy (LIMS) for combinations of pyrite, pyrrhotite, galena, and sphalerite. The effect of grinding, pH, and the presence of xanthate was studied. Metal ion transfer between sulphide minerals was determined.<br>Metal ion production with minerals in pairs was different from that for single minerals. The amount of metal ion in solution followed a galvanic interaction model, increasing for the anodic mineral and decreasing for the cat

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4

Modarres, Mohammad Hadi. "Reduced graphene oxide nanoparticle hybrids and their assembly for lithium-ion battery anodes." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/277144.

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Lithium-ion batteries (LIBs) are an integral part of consumer electronic devices and electric vehicles. There is a growing need for LIBs with higher capacity, rate performance and cycling stability. At the anode electrode these challenges are being addressed for instance by utilising materials with higher theoretical capacity compared to graphite (372 mAh/g) or by optimising the morphology of materials through nanostructuring of the electrode. In this thesis the former is investigated by synthesising a reduced graphene oxide (rGO) tin sulphide (SnS2) hybrid, and the latter by self-assembly of

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5

Mpinga, Cleophace Ngoie. "Removal and recovery of aluminium and sulphate ions from an alkaline medium using solvent extraction." Thesis, Cape Peninsula University of Technology, 2009. http://hdl.handle.net/20.500.11838/898.

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Thesis submitted in fulfilment of the requirements for the degree Master of Technology: Chemical Engineering in the Faculty of Engineering at the Cape Peninsula University of Technology<br>Throughout the world, many water resources are polluted by industrial and domestic effluents, acid mine drainage, etc. The increasing awareness and concern about the environment has motivated in the recent years extensive research into developing new efficient, cost effective and environmentally sound technologies to treat industrial solutions bearing metals and sludges. From the literature review, mu

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6

Kärner, Katrin. "The metallogenesis of the Skorpion non-sulphide zinc deposit, Namibia." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=985497890.

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7

Al-Maghrabi, Mufied Mahmoud. "Thermoluminescence spectra from sulphates, fluorides and garnets doped with rare earth ions." Thesis, University of Sussex, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366054.

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Luminescence measurements have been applied to three different structures namely, sulphate, fluorides and YAG. In all cases the RE doping suppresses the intrinsic emission and results in intense luminescence characteristic of the RE dopant. Additionally, in double doped samples, or contaminated ones, the TL data show that each dopant defines a glow peak, which is displaced in temperature relative to the others. Examples of this were discussed for CaS04:Ce,Mn; YAG:Nd,Tb,Cr,Mn; BaF2:Ho,Ce and BaF2:Tm,Ce. The data are discussed in terms of an energy transfer model between different parts of exten

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8

Bergius, Lina. "Sulfatmätningar i kokeriet." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-104912.

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Arbetet har mestadels utförts i kokeriet på Domsjö Fabriker i syfte att kartlägga hur processförhållandena hänger samman med koncentrationen sulfatjoner. Detta för att lättare kunna undvika förhållanden i processen som innebär mycket höga värden. Arbetet ingår i examen för högskoleutbildningen: processoperatör vid Umeå Universitet.Vid Domsjö Fabriker har tidigare liknande mätningar gjorts i kokeriet och det har konstaterats att koncentrationen sulfatjoner hänger samman med pH och tid. Syftet är att djupare kartlägga hur processförhållandena hänger samman för att lättare kunna undvika förhållan

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9

Tchoumou, Martin. "Hydrometallurgie du cuivre en milieu chlorure : attaques de minerais dosages polarographiques des solutions resultant de l'attaque et depot cathodique du cuivre." Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR13154.

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Etude dans le cadre de l'extraction de cu des minerais de type chalcopyrite. Lors de l'attaque des minerais de type chalcopyrite par des solutions de cu(ii) en milieu fortement chlorure, les metaux presents dans le minerai sous forme de sulfures passent en solution soit partiellement soit en totalite, et s elementaire precipite. Mise au point du dosage polarographique des ions cu, pb, zn et fe dissous. L'electrolyse de solutions a teneur elevee en cu(i) et contenant pb(ii), zn(ii) ou fe(ii) a mis en evidence un phenomene de codeposition de pb avec cu lorsqu'on opere a des densites de courant e

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10

Kladova, Anna Vadymivna. "Metals in proteins from sulphate-reducing bacteria: adenylate kinase and ATP sulfurylase. Proteins containing cobalt, zinc, iron (II) ions." Doctoral thesis, Faculdade de Ciências e Tecnologia, 2009. http://hdl.handle.net/10362/6342.

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A Thesis submitted at the Faculty Science and Technology of the New University of Lisbon for a degree in Doctor of Philosophy in Biochemistry with specialization in Physical Biochemistry<br>(fellowship BD SFRH/BD/24744/05)- Foundation for Science and Technology

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11

Adityawarman, Dendy. "Precipitation of Barium sulphate nanoparticles in microemulsion : experiments and modelling = Fällung von Bariumsulfat Nanopartikeln in Mikroemulsionen: Experimente und Modellierung /." [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=984494383.

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12

Elabar, Dawod. "Effect of sulphate impurity in chromic acid anodizing of aluminium and aluminium alloy." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/effect-of-sulphate-impurity-in-chromic-acid-anodizing-of-aluminium-and-aluminium-alloy(ec562f6a-6bc9-4bb4-9eee-468d539f90a2).html.

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In this work, the nucleation and growth of pores in anodic films formed on aluminium in chromic acid and the effect of low levels of sulphate impurity in the anodizing bath on the formation of the films on aluminium and AA 2024 alloy are investigated. The sulphate concentrations considered include levels within specified limits for industrial processing. The anodizing is carried out either potentiostatically or by stepping the voltage. The films are examined by scanning electron microscopy, transmission electron microscopy and atomic force microscopy to determine the pore spacing, pore populat

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13

Maciej, Marissa Lucy. "Azido sugars for the modification of glycosaminoglycans in biology." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/azido-sugars-for-the-modification-of-glycosaminoglycans-in-biology(cf34d9aa-d20b-4225-b871-93a5983832b6).html.

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Heparan sulphate (HS) is critical for embryonic development with involvement in a myriad of biological processes, centrally mediating morphogenic movements and facilitating the specification and differentiation of tissues. Complicated by its structural micro-heterogeneity along with expression on numerous different proteoglycan cores, the plethora of roles for HS in biology and their underlying mechanisms have not yet been fully defined. The discovery and characterisation of new reagents and methods for modification of HS expression and/or structure will aid efforts in elucidating the structur

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14

Ahmed, Amer Naji. "Rejection and critical flux of calcium sulphate in a ceramic titanium dioxide nanofiltration membrane." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/rejection-and-critical-flux-of-calcium-sulphate-in-a-ceramic-titanium-dioxide-nanofiltration-membrane(19fb66ec-3ba5-4b13-b65f-690fbb80ddc3).html.

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This thesis describes the rejection efficiency and the fouling behaviour of calcium sulphate solutes in a 1 nm tubular ceramic titanium dioxide nanofiltration membrane. Calcium sulphate is considered as one of the greatest scaling potential inorganic salts that responsible for membrane fouling which represents a main challenge in the expansion of membrane processes for desalination of brackish and saline water. The surface charge type and magnitude for the composite amphoteric TiO_2 membrane were characterised using streaming potential measurements. Electrokinetic membrane experiments were con

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15

Gustavsson, Catrin. "On the Interrelation Between Kraft Cooking Conditions and Pulp Composition." Doctoral thesis, Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4232.

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16

Silveira, Valdelice Rodrigues da. "Estudo do desempenho de resinas polim?ricas para remo??o de H2S do g?s natural." Universidade Federal do Rio Grande do Norte, 2007. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17774.

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Made available in DSpace on 2014-12-17T15:42:26Z (GMT). No. of bitstreams: 1 ValdeliceRS.pdf: 981957 bytes, checksum: cedb4f2ae440069c889ba97e29744a20 (MD5) Previous issue date: 2007-07-11<br>The natural gas (NG) is a clean energy source and found in the underground of porous rocks, associated or not to oil. Its basic composition includes methane, ethane, propane and other components, like carbon dioxide, nitrogen, hydrogen sulphide and water. H2S is one of the natural pollutants of the natural gas. It is considered critical concerning corrosion. Its presence depends on origin, as well as

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17

Silveira, Valdelice Rodrigues da. "Estudo do desempenho de resinas polim?ricas para remo??o de H2S do g?s natural." Universidade Federal do Rio Grande do Norte, 2006. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17780.

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Made available in DSpace on 2014-12-17T15:42:27Z (GMT). No. of bitstreams: 1 ValdeliceRS.pdf: 629576 bytes, checksum: 6bcf4a0b805ce82618289068cfb23b77 (MD5) Previous issue date: 2006-07-11<br>The natural gas (NG) is a clean energy source and found in the underground of porous rocks, associated or not to oil. Its basic composition includes methane, ethane, propane and other components, like carbon dioxide, nitrogen, hydrogen sulphide and water. H2S is one of the natural pollutants of the natural gas. It is considered critical concerning corrosion. Its presence depends on origin, as well as

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18

Boffito, D. C. "BIODIESEL PRODUCTION FROM NON-FOODSTUFF: CHEMISTRY, CATALYSIS AND ENGINEERING." Doctoral thesis, Università degli Studi di Milano, 2013. http://hdl.handle.net/2434/214934.

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1. Introduction Biodiesel (BD) is a liquid biofuel that is defined as a fatty acid methyl ester fulfilling standards such as the ones set by European (EN 14214) and the American (ASTM 6751) regulations. BD is obtained by the transesterification (Scheme 1.1) or alcoholysis of natural triglycerides contained in vegetable oils, animal fats, waste fats and greases, waste cooking oils (WCO) or side-stream products of refined edible oil production with short-chain alcohols, usually methanol or ethanol and using an alkaline homogeneous catalyst (Perego and Ricci, 2012). Scheme 1.1. Transest

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19

Rhodes, Rhys William. "Controlling the morphology of nanoparticle-polymer composite films for potential use in solar cells." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/controlling-the-morphology-of-nanoparticlepolymer-composite-films-for-potential-use-in-solar-cells(6bc2a3cc-7c11-4615-a202-bead6360af99).html.

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This thesis presents an investigation into the factors affecting the morphology of hybrid inorganic/organic photoactive layers used in photovoltaic cells. Although optimisation of the organic (polymer) phase has received substantial attention, research into the morphology of the inorganic phase (semiconducting nanocrystals) remains limited. It is believed that there is a strong link between the morphology of the final photoactive film and the quality of the initial nanocrystal dispersion. To this end, two nanocrystal systems were investigated; zinc oxide (ZnO) and lead sulphide (PbS). ZnO nano

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20

Montes, Diego Cerqueira. "Determinação de ânions sulfatos e nitratos em amostras aquosas de campos de petróleo como método de monitoramento de Bactérias Redutoras de Sulfato- BRS." Instituto de Ciências da Saúde, 2015. http://repositorio.ufba.br/ri/handle/ri/23487.

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Submitted by Programa de Pós-graduação em Biotecnologia (mebiotec.ufba@gmail.com) on 2017-04-05T12:59:59Z No. of bitstreams: 1 Dissertacao Final - Diego Montes.pdf: 3792184 bytes, checksum: 932c7d285674a48aa5a90cb88c53dd85 (MD5)<br>Approved for entry into archive by Delba Rosa (delba@ufba.br) on 2017-07-03T15:41:00Z (GMT) No. of bitstreams: 1 Dissertacao Final - Diego Montes.pdf: 3792184 bytes, checksum: 932c7d285674a48aa5a90cb88c53dd85 (MD5)<br>Made available in DSpace on 2017-07-03T15:41:00Z (GMT). No. of bitstreams: 1 Dissertacao Final - Diego Montes.pdf: 3792184 bytes, checksum: 932c7d28

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21

Yantasee, Wassana. "Kinetic and equilibrium analysis of metal ion adsorption onto bleached and unbleached kraft pulps." Thesis, 2001. http://hdl.handle.net/1957/33250.

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Most metal ions have negative impacts on pulp mill operations. The concentrations of metal ions on pulp fibers and in washwaters rise significantly with increased wastewater recycling. The development of technology to remove these metal ions requires an understanding of how metal ions are bound to pulp components. It is also desirable to predict distribution of metal ions between the pulp fibers and the washwaters. The adsorption isotherms for eight metal ions (Ca, Ba, Mn, Zn, Pb, Cd, Ni, Na) were measured on bleached and unbleached (brownstock) kraft pulps at neutral pH and temperatures rangi

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22

Yang, Chien-Te, and 楊建德. "Liquid Crystal Property and Lithium Ion Conductivity Study of Ethoxy or Sulphate Functionalized Imidazolium Salts." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/s7bd83.

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23

"A comparative study of contacting equipment for the recovery of copper from cupric sulphate solution." Thesis, 2005. http://hdl.handle.net/10413/2687.

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Ion exchange for the recovery of metals from solutions is a well established process. It features significantly in terms of being able to recover valuable substances from what would otherwise be waste streams as well as recovering substances that could be harmful to the environment if left in the waste stream. The more popular options for ion exchange processes could be batch, fixed bed, fluidized, moving bed, and chromatographic columns. Although most ion exchange processes tend to be batch processes making use of the fixed bed columns, technological developments enable the use of fluidized b

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24

Waduwara, Ishari. "Onion Root Anatomy and the Uptake of Sulphate and Phosphate Ions." Thesis, 2007. http://hdl.handle.net/10012/3092.

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Ions in the soil solution traverse many layers (epidermis, exodermis, central cortex, and endodermis) within the root to reach the stele. The endodermis is present in almost all vascular plants while the exodermis is found only in majority of angiosperm roots tested. The maturation of the exodermis and the death of epidermis alter the plasma membrane surface areas (PMSA) potentially available for ion uptake. Do these changes reduce the ion uptake in proportion to the loss of absorptive surface areas? To answer this question onion (Allium cepa L cv. Wolf) adventitious root segments representin

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25

Koul, Virander Kumar. "Absorption of Sodium chloride and sodium sulphate on mixture of weakly acidic and weakly basic ion exchange resins: equilibrium and kinetic studies." Thesis, 1996. http://localhost:8080/xmlui/handle/12345678/3330.

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26

Bruyns, Lenke. "Investigating the relationship between coal usage and the change in cations and sulphate fluxes in three rivers in the Waterberg, South Africa." Thesis, 2016. http://hdl.handle.net/10539/21012.

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The Matimba and soon to be completed Medupi power stations located in close proximity to the town of Lephalale are a cause for environmental concern due to the known effects that coal combustion has on air, soil and water quality. The Medupi power station is currently being constructed, while the Matimba power station may have already negatively altered the water quality of the rivers especially those downwind of the power stations. The Lephalala (perennial river, upwind), the Mokolo (perennial river, upwind) and Matlabas (seasonal river, downwind) Rivers were selected due to the locations rel

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27

Kekana, Paul Thabo. "Absorption of cobalt and nickel ions from sulphate media by oxalate-modified carbon pellets in a continuously stirred tank reactor." 2012. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000583.

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M. Tech. Chemical Engineering.<br>Discusses the reactive properties of oxalate molecules on the surface of activated carbons (ACs) so that they can bind selectively with base metals. Therefore, the experimental plan covered three main axes of study: Chemical modification of AC adsorbent and characterization, adsorption studies in batch and continuous modes, and adsorption modelling.

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28

Cichota, Rogerio. "Modelling sulphate dynamics in soils : the effect of ion-pair adsorption : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Soil Science at Massey University." 2007. http://hdl.handle.net/10179/1443.

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Sulphur is an important nutrient to plants, and reports of its deficiency have been increasing worldwide. Sulphur starvation causes losses in both yield and quality, and it reduces nitrogen use efficiency of plants. As the timing for fertilisation can be decisive for avoiding deleterious effects, improvements in the description of the sulphur balance in fields are a valuable contribution for assisting fertiliser management. Sulphate is the most important inorganic form of sulphur in soils. Being the mobile form, sulphate is readily available for plants, and also prone to be leached. Therefore

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