Second dissociation constant of hydrogen sulfide

Meyer, Beat; Ward, Kenneth; Koshlap, K.; Péter, László

doi:10.1021/ic00158a027

Cited by 113 publications

(72 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…non-ideal responses (Frevert 1980, Camman & Galster 1996, signal drift and very long response times at low sulfide levels (Harsanyi et al 1984, Kiihl & J~r g e n s e n 1992), susceptibility of the polycrystalline Ag2S membrane to physical damage, or mixed potentials due to coprecipitates in the membrane (van Staden 1988, De Marco et al 1990). Furthermore, the large uncertainty in the determination of the second dissociation constant of H2S (Meyer et al 1983, Myers 1986, Millero et al 1988, Millero & Hershey 1989 makes it problematic to directly convert microprofiles of S2-activity measured with the Ag/Ag2S electrode to total sulfide concentrations, even if a good alignment with a measured pH profile exists. In practice such conversions thus often rely on interpolation from calibration curves obtained at various pH.…”

Section: Introductionmentioning

confidence: 99%

A H2S microsensor for profiling biofilms and sediments: application in an acidic lake sediment

Kühl¹,

Steuckart²,

Eickert³

et al. 1998

Aquat. Microb. Ecol.

172

View full text Add to dashboard Cite

We developed a microsensor for the amperometric detection of dissolved hydrogen sulfide, H,S, in sedirnents and biofilms. The mlcrosensor exhibits a fast (tgO c0.2 to 0.5 S ) and linear response to H2S over a concentration range of 1 to >l000 pm01 H2S I-', and has a low stirring dependency of the microsensor signal (c1 to 2%). We used the new mlcrosensor to obtain the first microprofiles of H2S in an acidic lake sediment with a several cm thick flocculant surface layer. Despite the low pH of 4.6, a relative low SO,'-level in the lake water, and a broad O2 respiration zone of ca 6 mm, we were able to measure H2S depth profiles in the sediment at a good resolution, that allowed for calculation of specific sulfate reduction and H2S oxidation activities. Such calculations showed highest sulfate reduction activity in the anoxic sediment down to ca 20 mm depth A comparison of calculated area1 rates of O2 consumption and sulfate reduction Indicated that sulfate reduction accounted for up to 13 % of total organic carbon mineralization in the acidic sediment. All produced H2S was reoxldized aerobically with O2 at the oxic-anoxic interface. In addition to its good performance in acidic environments, the new H2S microsensor has proven useful for sulfide measurements in neutral and moderate alkaline (pH < 9) biofilms and sediments, and thus is a true alternative to the traditionally used potentiometric Ag/Ag2S microelectrode for most applications in aquatic ecology and biogeochemistry.

show abstract

Section: Introductionmentioning

confidence: 99%

A H2S microsensor for profiling biofilms and sediments: application in an acidic lake sediment

Kühl¹,

Steuckart²,

Eickert³

et al. 1998

Aquat. Microb. Ecol.

172

View full text Add to dashboard Cite

show abstract

“…By contrast, 413 mg H 2 S dissolves in 100 mL of water at 20°C. In solution, H 2 10) Note also that Meyer et al 28) reported a pK 2 of 13.78. Because it is difficult to determine which form of H 2 S (H 2 S, HS !…”

Section: Basic Properties Of H 2 Smentioning

confidence: 87%

Hydrogen sulfide and polysulfides as signaling molecules

Kimura

2015

Nitric Oxide

View full text Add to dashboard Cite

Hydrogen sulfide (H 2 S) is a familiar toxic gas that smells of rotten eggs. After the identification of endogenous H 2 S in the mammalian brain two decades ago, studies of this molecule uncovered physiological roles in processes such as neuromodulation, vascular tone regulation, cytoprotection against oxidative stress, angiogenesis, anti-inflammation, and oxygen sensing. Enzymes that produce H 2 S, such as cystathionine O-synthase, cystathionine .-lyase, and 3-mercaptopyruvate sulfurtransferase have been studied intensively and well characterized. Polysulfides, which have a higher number of inner sulfur atoms than that in H 2 S, were recently identified as potential signaling molecules that can activate ion channels, transcription factors, and tumor suppressors with greater potency than that of H 2 S. This article focuses on our contribution to the discovery of these molecules and their metabolic pathways and mechanisms of action.

show abstract

“…[ 4 ]-in THF, cobaltocene and [Co(CO)Jare formed as a radical pair which undergoes a rapid back electron transfer to the starting ion pair [59]. In the presence of phosphites the formation of stable products takes place.…”

Section: Ion Pairsmentioning

confidence: 99%

“…Such a redox process can occur thermally or photochemieally. Intermolecular light-induced electron transfer involving transition metal complexes has been extensively studied during the last 15 years [1][2][3][4][5][6][7][8]. This interest was stimulated, at least partially, by attempts to develop an artificial photosynthesis for the conversion and chemical storage of solar energy [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…Secondly, a direct optical electron transfer can be achieved if the electron donor and acceptor are electronically coupled by a close contact. The majority of studies involving coordination compounds has been devoted to excited state electron transfer [1][2][3][4][5][6][7][8] while much less information is available on the second mechanism [6][7][8][12][13][14][15] which is the subject of the present review.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation