Sulfide-containing Solutions Research Articles

Effects of some ions on ion-selectivity of ferrous sulfide film

The ion-selectivity of ferrous sulfide film formed on a cellulose sheet was determined by measuring the film potentials in neutral chloride solution. The results show that ferrous sulfide film is a bipolar film consisting of an inner cation-selective layer and an outer anion-selective layer. This kind of film structure can accelerate the localized corrosion of steel. The influence of some anions, cations and imidazoline corrosion inhibitor on ion-selectivity of the film was also investigated. The ion-selectivity of the film is altered from bipolar to anion-selective with the adsorption of Ca2+, Mg2+ and Ba2+ ions, or to cation-selective with the adsorption of MoO42-, PO 43-and imidazoline inhibitor. Potentiodynamic polarization, AC impedance technology, and the weight-loss method were used to understand the relationship between the ion-selectivity and corrosion behaviors of steel in sulfide-containing solution.

Corrosion Behavior of Copper–Nickel Alloys in Neutral Chloride and Sulfide Containing Solutions

The corrosion behavior of Cu30Ni and МНЖМц 30-1-1 alloys in oxygen-containing chloride solutions (0.1–0.5 N NaCl) with and without Na2S additive (2–1000 mg/l) is studied with radiometric and electrochemical methods by taking into account the amount of oxygen sorbed in the course of corrosion. In blank solutions, a film of corrosion products is formed on the alloy surface; the thickness and copper content of the film increase with a decrease in chloride concentration. The corrosion rate in sulfide-containing solutions is higher than in sulfide-free ones. In the initial corrosion period, nickel compounds are accumulated in the film. With an increase in sodium sulfide concentration, corrosion accelerates. Additionally alloying the Cu30Ni alloy with manganese and iron reduces its rate by half.

A thin-layer amperometric sensor for hydrogen sulfide: the use of microelectrodes to achieve a membrane-independent response for Clark-type sensors.

An electrochemical cell design of the Clark type including a thin layer of electrolyte in contact with a microelectrode has been successfully applied for the determination of sulfide utilizing its electrochemically initiated reaction with aqueous diethyl-p-phenylenediamine. The analytical parameters obtained were independent of the membrane used to separate the inner chamber and the outside sulfide-containing solution. The independence arises since the thickness of the diffusion layer associated with the microelectrode is small and, in contrast to the conventional macroelectrode Clark electrode, does not impinge on the membrane. This provides an improvement in gas sensor design and development as it obviates the need for membrane calibration and should simplify the application of Clark cells for variable-temperature measurements.

Characterisation by Mössbauer Spectroscopy of the Forms of Iron in Sulfide-Rich Fulvic Acid Solutions

Variations in the nature of the bonding between iron and fulvic acid as a function of pH in sulfide-rich solutions have been investigated by 57Fe Mossbauer spectroscopy. In all solutions iron was enriched to 95% in the 57Fe isotope and ratios of Fe : fulvic acid were maintained at 1 : 100 on a weight basis for all measurements. When the pH was decreased below 5.0, there was a progressive change in the composition of the spectra, which contained three distinct components that were similar to those seen in the absence of sulfide; i.e., a sextet from magnetically-dilute Fe(III) and doublets from Fe(II) and Fe(III). There was, however, a higher proportion of the iron as Fe(II) in the sulfide-containing solutions and this represented the only form of iron at very low pH. Establishment of equilibria was slow as evidenced by considerable hysteresis between the compositions of the solutions with decreasing and increasing pHs. On increasing the pH, sulfide prevented the formation of magnetically dilute Fe(III) species and instead, in the range 3.5–6.0, compounds were generated with parameters consistent with sulfur being coordinated to the iron. One had parameters similar to those of pyrite and hence probably contains disulfide (S22−) units, whilst a second, with poorly defined magnetic hyperfine splitting, may contain monosulfide (S2−) units, with structures related to either pyrrhotite (Fe1−xS) or greigite (Fe3S4). A third component probably corresponds to a mononuclear low spin Fe(II) complex, involving sulfur and fulvic acid in the iron coordination sphere. These species were oxygen-sensitive and decomposed to yield magnetically dilute Fe(III) complexes and Fe(III) oxyhydroxides on aeration of the solutions.

Solubility of gold in sulfide-containing aqueous solutions at T=300°C

Solubility of gold in sulfide-containing aqueous solutions at T=300°C

ChemInform Abstract: ISOLATION OF A SULFUR‐RICH BINARY MERCURY SPECIES FROM A SULFIDE‐CONTAINING SOLUTION: (HG(S6)2)2‐, A COMPLEX WITH S62‐ LIGANDS

Chemischer InformationsdienstVolume 15, Issue 19 Preparative Inorganic Chemistry ChemInform Abstract: ISOLATION OF A SULFUR-RICH BINARY MERCURY SPECIES FROM A SULFIDE-CONTAINING SOLUTION: (HG(S6)2)2-, A COMPLEX WITH S62- LIGANDS A. + MUELLER, A. + MUELLERSearch for more papers by this authorJ. SCHIMANSKI, J. SCHIMANSKISearch for more papers by this authorU. SCHIMANSKI, U. SCHIMANSKISearch for more papers by this author A. + MUELLER, A. + MUELLERSearch for more papers by this authorJ. SCHIMANSKI, J. SCHIMANSKISearch for more papers by this authorU. SCHIMANSKI, U. SCHIMANSKISearch for more papers by this author First published: May 8, 1984 https://doi.org/10.1002/chin.198419033AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume15, Issue19May 8, 1984 RelatedInformation

Isolation of a Sulfur‐Rich Binary Mercury Species from a Sulfide‐Containing Solution: [Hg(S6)2]2⊖, a Complex with S Ligands

The ion [S6HgS6]2⊖ can be viewed as an inorganic spiro compound. It is the first homoleptic complex with bidentate S ligands. Formation of such ions in alkaline, sulfide-containing solutions is of general chemical (possible formation of unusual thiometallates), and also of analytical and minerological, interest.

Stress Corrosion Cracking Studies Of Austenitic Stainless Steels In Aqueous Ammonium Chloride Solutions

Abstract The susceptibility of the 300-series stainless steels to stress corrosion cracking in aqueous ammonium chloride solutions was determined by exposing highly stressed, sensitized wires to the test solution and recording the time to failure. The effects of the following variables are reported: NH4Cl concentration, pH, test atmosphere, H2S, type of neutralizer and pre-sulfidation of the test wires. Most of the materials tested had increased susceptibility to failure in hydrogen sulfide-containing solutions. Ammonium chloride concentration over the range studied had no significant effect on the susceptibility toward stress corrosion cracking, regardless of wire treatment. The addition of an amine-type inhibitor in most cases increased rather than decreased susceptibility to stress corrosion cracking. 3.5.8, 6.2.5