Determination of sulfide by square-wave polarography

Redinha, J.S.; Paliteiro, Carlos; Pereira, Jorge L.C.

doi:10.1016/s0003-2670(97)00333-4

Cited by 21 publications

(22 citation statements)

References 13 publications

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“…3). This seems to be in contradiction with the claim of other authors [10,12] about the formation of HgO at A1. Deposition in Figure 3 was done at À 0.05 V and potential was scanned in the cathodic direction.…”

Section: Peaks A1/c1contrasting

confidence: 99%

“…Redinha et al [12] and Pereira and Peter [10] observed the voltammetric peaks corresponding to our A1/C1 and ascribed them to the transformation of bHgS to the more stable red form, a-HgS, accompanied by the deposition of HgO on top of the HgS layer.…”

Section: Peaks A1/c1supporting

confidence: 53%

“…The processes represented by C3/A3 are well described by many authors (see introduction), but generally it was claimed that C3 is a single peak [11 -18], while A3 could be split into several sharp peaks representing deposition of several HgS layers [7,8,11,12]. This is true when a few orders of magnitude higher sulfide concentrations and slow scan rates are used.…”

Section: Resultsmentioning

confidence: 99%

“…Usually well separated voltammetric peaks were observed for the anodic deposition of HgS but only one peak for the dissolution of HgS layers [11,12]. This cathodic peak was often used for the quantitative determination of sulfide and elemental sulfur in natural waters [13 -18] as well as for measuring sulfur speciation in the environment [15, 17, 19 -23].…”

Section: à2mentioning

confidence: 99%

“…Another transformation of HgS layer that was claimed to take place at potentials between À 0.1 and À 0.2 V is the transformation of b-HgS (black, cubic) into a-HgS (red, hexagonal) [10,12]. Our A2/C2 peaks are at more negative potentials and it is questionable whether such a transformation could happen without the hysteresis between the two peaks.…”

Section: à2mentioning

confidence: 99%

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Electrochemical Processes of Sulfide in NaCl Electrolyte Solutions on Mercury Electrode

Krznarić¹,

Ciglenečki-Jušić²

2005

Electroanalysis

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The electrochemical processes of sulfide in NaCl electrolyte solutions were studied using stripping cyclic voltammetry, differential capacity and chronoamperometric measurements. Some new effects were observed and are here discussed. At potentials around À 0.1 to À 0.3 V a pair of Faradaic adsorptive peaks, which can only be observed in the presence of chloride, is attributed to the formation of HgCl 2À 4 ion from the deposited layer of HgS. A second pair of peaks of purely capacitive character was observed at À 0.4 V. This is the result of the reorientation and partial desorption or transformation of HgS layers. The formation and dissolution of HgS layers on mercury has been well investigated previously. We observed some new effects after depositing approximately ten layers of HgS and attributed this to the formation of polysulfides at positive potentials.

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Section: Peaks A1/c1contrasting

confidence: 99%

Section: Peaks A1/c1supporting

confidence: 53%

Section: Resultsmentioning

confidence: 99%

Section: à2mentioning

confidence: 99%

Section: à2mentioning

confidence: 99%

See 3 more Smart Citations

Electrochemical Processes of Sulfide in NaCl Electrolyte Solutions on Mercury Electrode

Krznarić¹,

Ciglenečki-Jušić²

2005

Electroanalysis

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Voltammetric Behavior of MoS$\rm{ {_{4}^{2-}}}$ and SbS$\rm{ {_{4}^{3-}}}$ as Possible Components of “Dissolved Sulfide” in Oxic Natural Waters

Ciglenečki

Helz

2003

Electroanalysis

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Nanomolar concentrations of dissolved sulfide have been observed in O 2 -bearing natural waters. The sulfide consists of oxidation-resistant, unknown chemical components that might include metal-sulfide complexes, elemental sulfur in various forms or organic sulfur compounds. Here we show that thioanions are also plausible components. Tetrathiomolybdate and tetrathioantimonate ions deposit respectively 3 and 4 equivalents of HgS at mercury electrodes. In cathodic stripping voltammetry, a common method to quantify nanomolar sulfide in nature, MoS would therefore contribute to ™total dissolved sulfide.∫ Limited evidence suggests that thioanions may be powerful complexing agents that would be capable of affecting trace metal speciation and bioavailability in natural waters.

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Voltammetric Determination of Low‐Molecular‐Weight Sulfur Compounds in Hydrothermal Vent Fluids – Studies with Hydrogen Sulfide, Methanethiol, Ethanethiol and Propanethiol

et al. 2010

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Determination of sulfide compounds in hydrothermal vent fluid samples was performed by DPCSV. The methodology was applied to speciate sulfides via primitive and first-derivative curve interpretation. Hydrogen sulfide, methanethiol, and propanethiol were simultaneously assayed in samples containing no ethanethiol. In the presence of ethanethiol, the organic sulfides were determined without speciation. Sulfides were determined in an acidic electrolyte, and detection limits ranging from 0.1 to 1.1 mmol L À1 were calculated. The method was tested in real hydrothermal vent fluid samples, with recoveries ranging from 86.9% (R -SH) to 115.3% (H 2 S). Interference of the metallic species present in seawater was investigated.

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Determination of sulfide by square-wave polarography

Cited by 21 publications

References 13 publications

Electrochemical Processes of Sulfide in NaCl Electrolyte Solutions on Mercury Electrode

Electrochemical Processes of Sulfide in NaCl Electrolyte Solutions on Mercury Electrode

Voltammetric Behavior of MoS$\rm{ {_{4}^{2-}}}$ and SbS$\rm{ {_{4}^{3-}}}$ as Possible Components of “Dissolved Sulfide” in Oxic Natural Waters

Voltammetric Determination of Low‐Molecular‐Weight Sulfur Compounds in Hydrothermal Vent Fluids – Studies with Hydrogen Sulfide, Methanethiol, Ethanethiol and Propanethiol

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