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alkaline sulfite reduction treatment of marine iron

ICOMCC Publications OnlineContribution Title Alkaline sulfite reduction treatment of marine iron Main Author N.A. North Coauthors C. Pearson Working Group Studies and Researches on Underwater Archaeology Type Paper Keywords Language English Year / Venue 1975 VeniceThe application of subcritical fluids for thesequently to stabilize marine iron artifacts (a) Alkaline soaking (b) Cathodic polarization in alkaline solutions (c) Chemical reduction risks to the artifact during treatment for different types of marine or terrestrial artifacts. For these reasons, the elevated temperature often employed with alkaline sulfite solutions, there have Residues from alkaline sulphite treatment and theirNevertheless, alkaline sulphite treatment of iron obj

BOILER WATER TREATMENT FUNDAMENTALS DieselShip

Sep 03, · Other impurities which will affect the boiler water treatment control include Copper, Iron Oxides, oil and dissolved gases. Copper In boilers, the source of this corrosion could be dissolved gases in the boiler water or the excessive use of Hydrazine which will corrode Copper and Copper alloys, allowing Copper to be carried back to the boiler.

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In situ prepared algaesupported iron sulfide to remove

The effects of algae on the removal of contaminant by iron sulfide (FeS) are still unknown. Chlorella vulgaris (CV), a remarkable algal specie, was used to prepare the CVsupported FeS (CVFeS) and to investigate the role that CV plays in the removal of a heavy metal (i.e., hexavalent chromium (Cr(V

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DEGRADATION OF SELENOCYANATE WITH AN ADVANCED

(ARPs) as wastewater treatment processes. ARPs combine activation methods and appropriate reductants to produce reductive free radicals. Activation methods include ultraviolet light (UV), electron beam, ultrasound and microwaves. Dithionite, sulfite, sulfide and ferrous iron are common reductants used by our group. When reductants are

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Mark R. Gilberg and Nigel J. Seeley

involving heat treatment, one alone, alkaline sodium sulphite reduction, has met with some success. This method was originally published [2] as a means of extracting chloride ions from marine cast iron artifacts, though recent workers [3] have applied the technique to wrought iron from nonmarine sources. As originally reported [2], marine cast iron artifacts were treated by immersion in 0.5N NaOH/0.5N

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Geochemistry of reduced inorganic sulfur, reactive iron

Feb 06, · The global biogeochemical cycles of carbon, iron, and sulfur are closely linked during early diagenesis to form sedimentary sulfidebearing minerals (Morse and Rickard 2004; Canfield et al. 2005; Johnston et al. 2014).Interactions and limiting components of these cycles within different formation environments can dictate the geochemistry of the sulfidic material formed (Morgan et al. 2012).

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Iron Conservation Part I Introduction and Equipment

Only after an artifact has been evaluated and cleaned can the appropriate conservation measures be taken. The various treatments available for the conservation of iron can be organized into five general categories 1. Electrochemical cleaning a. Galvanic cleaning b. Electrolytic reduction. 2. Alkaline sulfite treatment. 3. Chemical cleaning. 4. Annealing. 5.

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OBSERVATIONS ON THE EVOLUTION OF Coal Mine

THE IRON SULFIDE MINERALS ARE STABLE TO CHANGE FOR THIS SYSTEM IN AN ALKALINE, REDUCING ENVIRONMENT. They are unstable in an acid, oxidizing environment, thus subject to oxidation and hydrolysis to create different ironsulfuroxygen products, most of which are highly water soluble, thus water degrading.

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Corrosion in Salt Water Marine Engines Part 2

Alkaline Sulfite Treatment. This method is the other of the two preferred methods used by marine archeologists. I have not tried this process nor do I know anybody whom has. It does appear to meet the requirements of both oxide treatment and also chloride removal.

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Dominance of sulfurfueled iron oxide reduction in low

Apr 14, · Instead, we predict that sulfide oxidation and the subsequent rereduction of intermediate sulfur species, defined here as S 0 (elemental sulfur), were likely responsible for the majority of the additional Fe(III) reduction; in essence, a cryptic sulfur cycle as proposed previously in subglacial and marine systems (Mikucki et al.,

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Stabilization treatment of cultural heritage artefacts In

Mar 01, · Alkaline sulfite reduction treatment of marine iron, in icom committee for conservation 4th Triennial Meeting , Venice, 1318 October. Preprints, International Council of Museums (

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Sulfurmediated electron shuttling during bacterial iron

May 30, 2014· Abstract. Microbial reduction of ferric iron [Fe(III)] is an important biogeochemical process in anoxic aquifers. Depending on groundwater pH, dissimilatory metalreducing bacteria can also respire alternative electron acceptors to survive, including elemental sulfur (S 0).To understand the interplay of Fe/S cycling under alkaline conditions, we combined thermodynamic geochemical

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New perspectives regarding the stabilization of

a significant risk that the original surface may be lost, The desalination of terrestrial iron in alkaline sulfite particularly on cast iron artifacts. after a standard plasma treatment has been reported Electrochemical stabilization in potentiostatic mode is to be up to four times faster with this pretreatment than still a fairly long procedure and weakens the objects due 114 paper 28. mardiKian stabilization of terrestrial and marine

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A Matter of Timing Contrasting Effects of Hydrogen

Aug 31, · Hydrogen sulfide (H 2 S), well known for its toxic properties, has recently become a research focus in bacteria, in part because it has been found to prevent oxidative stress caused by treatment with some antibiotics. H 2 S has the ability to scavenge reactive oxygen species (ROS), thus preventing oxidative stress, but it is also toxic, leading to conflicting reports of its effects in

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The application of subcritical fluids for the

sequently to stabilize marine iron artifacts (a) Alkaline soaking (b) Cathodic polarization in alkaline solutions (c) Chemical reduction risks to the artifact during treatment for different types of marine or terrestrial artifacts. For these reasons, the elevated temperature often employed with alkaline sulfite solutions, there have

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ICOMCC Publications Online

Contribution Title Alkaline sulfite reduction treatment of marine iron Main Author N.A. North Coauthors C. Pearson Working Group Studies and Researches on Underwater Archaeology Type Paper Keywords Language English Year / Venue 1975 Venice

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Materials Free FullText Nanostructured Iron Sulfide/N

Nanostructured FeS dispersed onto N, S dualdoped carbon nanotubegraphene composite support (FeS/N,SCNTGR) was prepared by a simple synthetic method. Annealing an ethanol slurry of Fe precursor, thiourea, carbon nanotube, and graphene oxide at 973 K under N2 atmosphere and subsequent acid treatment produced FeS nanoparticles distributed onto the N, Sdoped carbon

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Sulfites for Oxygen Control Scranton Associates

concentration of catalysts. The performance of sodium sulfite is very sensitive to catalysis from trace amounts of manganese, copper, iron, nickel, or cobalt. The sulfite/oxygen reaction is known to be inhibited by some alcohols, phenols, amines, and thiosulfate. Other contaminants or organic treatment chemical such as corrosion inhibitors, scale

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Corrosion in Salt Water Marine Engines Part 1

For nonmetric water weighs 8.33 pounds per gallon so for 10 gallons of solution the total weight is 83 pounds the weight of sodium carbonate is 83 /19 = 4.4 pounds. 4) Place the parts in the bath. 5) Monitor the pH and keep in the range 1013. Note the mixture will initially be pH @11.5. 6)

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The alkaline photosulfite system triggers Fe(IV/V

Dec 01, · In the processes of sulfite activation via catalysis under irradiation, the mainly possible ROS species include O 2 , SO 3 , SO 5 , SO 4 , and OH, , , , and the degradation ability of catalysis/sulfite/light system is weak under alkaline conditions , .However, the present study shows a dramatic decay of roxarsone at pH 10 under photoirradiation.

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CATION EXCHANGE AND HIGH ALKALINE MINE WATER A

The pH set point at the water treatment facility has been reduced since the increase in alkalinity was realized. Substantial reduction in reagent use has,resulted since the increase in alkalinity from A Block. The manganese concentrations remained low following the reduction of pH set point. High Alkaline Water Chemistry

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Materials Free FullText Nanostructured Iron Sulfide/N

The oxygen reduction reaction (ORR) is crucial for electrochemical energy conversion and storage devices including fuel cells and lithiumair batteries [1,2].The fuel cell is a promising energy conversion device due to its high energy density, rapid startup, and zero emissions [3,4,5].ORR typically occurs at the cathode of fuel cells heavily loaded with platinum [6,7], but its high cost, low

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Residues from alkaline sulphite treatment and their

Nevertheless, alkaline sulphite treatment of iron objects and quantitative data indicate that alkaline sulphite washing evaporating these to dryness; can remove a large percentage of the total chloride present in an object (Watkinson 1996, AlZahrani 1999, Identifying the compounds formed upon drying using Watkinson and AlZahrani 2008) and qualitative studies XRD; indicate that such objects have

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Simple combination of a protic salt and an iron halide

The prototype catalyst after post treatment (acid leaching and 2 nd carbonization) also exhibited efficient reduction of oxygen in acidic media. The contribution of FeN bonds to the observed activity in acidic solution was less than in alkaline solution.

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Silver Conservation Conservation Manual Conservation

ALKALINE DITHIONITE The alkaline dithionite treatment is similar to the alkaline sulfite treatment for iron. It is a relatively cheap, simple, and efficient method for the uniform reduction of silver corrosion products to metallic silver (MacLeod and North 1979). The steps involved in the alkaline dithionite treatment of silver are as follows 1.

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