The Stability of Thiocomplexes and Solubility Products of Metal Sulphides: I. Cadmium Sulphide

Ste-Marie, J.; Torma, A.E.; Gübeli, A. O.

doi:10.1139/v64-097

Cited by 49 publications

(21 citation statements)

References 2 publications

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“…Dyrssen and Wedborg (1991) showed, using correspondence plots for Hg stability constants, and theory relating to calculation of mixed ligand complexes (Anfalt et al, 1968) differs by approximately 12 log units. Similar incompatibilities were also recognized in computing the intrinsic solubility products for ZnS and CdS, based respectively on the work by Gubeli and Ste-Marie (1967) and by Ste-Marie et al (1964).…”

Section: D5 Of 22mentioning

confidence: 62%

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Research Project on CO2 Geological Storage and Groundwater Resources: Water Quality Effects Caused by CO2 Intrusion into Shallow Groundwater

Birkhölzer¹,

Apps²,

Zheng³

et al. 2008

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Section: D5 Of 22mentioning

confidence: 62%

“…Robie and Hemingway (1995) 3. Dyrssen and Wedborg (1991) from data reported by Gubeli and Ste-Marie (1967) and Ste-Marie et al (1964) 4. Dyrssen and Wedborg (1989) 5.…”

Section: D3 Estimation Of the Dissociation Constants Of Neutral Sulfmentioning

confidence: 99%

Research Project on CO2 Geological Storage and Groundwater Resources: Water Quality Effects Caused by CO2 Intrusion into Shallow Groundwater

Birkhölzer¹,

Apps²,

Zheng³

et al. 2008

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“…PVDF and PTFE membranes were selected as the candidate filters since Hg is considered to have a weak affinity with these two materials. 201 Hg 2+ in NaNO3/NaOH solution (50 μg L -1 ) with a pH of 4-6 and 8 was filtered through the candidate filters, and 201 Hg 2+ concentrations in the filtrates were determined by the isotope-dilution method.…”

Section: Selection Of Proper Filter For Cinnabar Suspension Filtrationmentioning

confidence: 99%

“…After shaking well, 10 mL sample was collected from each bottle using a 10 mL syringe and filtered through a 0.22 µm PTFE membrane filter. 201 HgCl2 was added into the rest bottles with cinnabar suspension to form a final concentration of 1, 6, 20, and 50 μg L -1 as 201 Hg, respectively. After shaking well, 10 mL suspension sample was immediately taken from each bottle and filtered through 0.22 µm PTFE membrane.…”

Section: Hg Isotope Replacement Experimentsmentioning

confidence: 99%

“…After shaking well, 10 mL suspension sample was immediately taken from each bottle and filtered through 0.22 µm PTFE membrane. Concentrations of residual spiked 201 Hg and natural Hg in these samples were analyzed using the isotope dilution technique mentioned in the Materials and method part of the main text. suggest that caution should be exercised when evaluating the role of DOM in cinnabar dissolution, as the interaction of DOM with cinnabar is rather complicated depending on the varieties of DOM structures and compositions, the ratio between DOM and cinnabar, and probably other experiment conditions.…”

Section: Hg Isotope Replacement Experimentsmentioning

confidence: 99%

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Mercury Sulfide Dissolution in Environmental Conditions: Thermodynamic and Kinetic Approaches

Jiang¹

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Considering the lack of feasible techniques to differentiate dissolution and readsorption processes, I first developed an efficient method using isotope tracer and isotope dilution techniques to investigate the re-adsorption of released Hg during HgS dissolution.The HgS dissolution rate with consideration of re-adsorption was two times the rate calculated from detecting Hg alone in the presence of O2, indicating the importance of Hg re-adsorption during HgS dissolution. I further examined the role of Hg-ligand complexation in HgS dissolution and Hg(II) re-adsorption using a thermodynamic vii adsorption method, selecting L-cysteine (Cys) as a model compound for low molecular weight ligands and Waskish fulvic acid (FA) for natural dissolved organic matter (DOM).My results suggest that the presence of Cys enhanced HgS dissolution through the decreased re-adsorption of Hg-Cys complex, whereas Waskish FA inhibited HgS dissolution, possibly because of the adsorption of FA on HgS surface that covered dissolution sites.I further employed a geochemical modeling method to study Hg speciation and the relation of iHg speciation to MeHg, aiming to provide a methodological example for potentially evaluating the implications of Hg species distribution during HgS dissolution on MeHg production. I applied geochemical model PHREEQC to the Florida Everglades, a well-studied wetland with model input parameters available, to determine the distribution of iHg in surface water at different sites. The modeling results suggest that sulfide and DOM govern iHg speciation, and the Hg-sulfide and Hg-DOM species are related to MeHg in environmental media but not fish, suggesting the importance of iHg speciation in MeHg production and the complexity of Hg bioaccumulation.viii water, soil, and sediment and can be methylated to the toxic MeHg through microbemediated (e.g., sulfate reducing bacteria, SRB or iron reducing bacteria, IRB) and abiotic processes (7, 9, 10). Because of its lipophilic and protein-binding properties, MeHg is then easily accumulated by aquatic biota through the food web (7).All Hg forms, in particular the organomercury species, are highly toxic substances (11).Acute Hg exposure can produce permanent damage to the nervous and other systems to cause a range of symptoms such as paresthesia, ataxia, sensory disturbances, tremors, renal toxicity, myocardial infarction, and even death (12). Chronic Hg exposure was considered to mainly occur from the consumption of contaminated fish and other aquatic organisms (13,14). Rice is another important pathway for human exposure to MeHg in recent years. 2This was first discovered in Guizhou province, China, and it potentially exists elsewhere (15-17). The toxicity of Hg depends on the chemical form and the sources of exposure (11).The most dangerous mercury species is MeHg, which is obtained mainly from the diet and can be almost completely absorbed into blood and then be distributed to other organs in the human body, such as brain, kidney, liver, hair, and other tissues within a f...

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Kinetics of bio‐oxidation of metal sulphides

et al. 1974

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The microbiological oxidation of cadmium, cobalt, nickel and zinc sulphides has been investigated using a pure strain of Thiobacillus ferrooxidans. Kinetic parameters (Vm and K) have been derived regarding the effect of initial total surface area of these substrates. A relationship is suggested to exist between the rate of sulphide oxidation and the solubility product of the respective metal sulphide.

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The Stability of Thiocomplexes and Solubility Products of Metal Sulphides: I. Cadmium Sulphide

Abstract: The nature and stability of cadmium sulphide complexes in aqueous solutions have been investigated. The total concentration of the metal in solution was determined a t constant temperature and ionic strength, and a t various pH values, by a radioactive tracer technique.

Cited by 49 publications

References 2 publications

Research Project on CO2 Geological Storage and Groundwater Resources: Water Quality Effects Caused by CO2 Intrusion into Shallow Groundwater

Research Project on CO2 Geological Storage and Groundwater Resources: Water Quality Effects Caused by CO2 Intrusion into Shallow Groundwater

Mercury Sulfide Dissolution in Environmental Conditions: Thermodynamic and Kinetic Approaches

Kinetics of bio‐oxidation of metal sulphides

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