Specrophotometric Determination of Tetrathionate

Nietzel, O. A.; DeSesa, M. A.

doi:10.1021/ac60107a057

Cited by 33 publications

(10 citation statements)

References 2 publications

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“…h) Long-chain polythionates will react with cyanide in a similar way as elemental sulfur and will also exhibit a strong UV absorption. This can be expected from the corresponding reactions [54] and the UV spectra [28] of S 4 0 6 2 ", S 5 0 6 2 ", and S 6 0 6 2~:…”

Section: Nature Of the "Elemental Sulfur" (S°) Produced By Certain Sumentioning

confidence: 75%

The Molecular Composition of Hydrophilic Sulfur Sols Prepared by Acid Decomposition of Thiosulfate [1]

Steudel

Göbel

Holdt

1988

Zeitschrift Für Naturforschung B

123

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Hydrophilic sulfur sols prepared from sodium thiosulfate and concentrated sulfuric acid and purified by repeated NaCl precipitation and peptization in water have been studied by chemical analysis, vibrational spectroscopy, ion-pair chromatography and reversed-phase HPLC. The composition of the sol is Na1.64S28.6O6 · 5.9/n Sn · 1.0 NaCl. The elemental sulfur Sn (n = 6-14; mainly S 8) accounts for 17% the total sulfur; 83% of the S are present as long-chain polythionates which form micelles in which the Sn molecules are dissolved. On aging of the sol at 20 °C the polythionate micelles decompose to give water-soluble short-chain polythionates and elemental sulfur which precipitates from the solution. The micelle structure of hydrophilic sulfur sols may serve as a model for the so-called sulfur globules (S°) formed intra- or extracellularly by many sulfur bacteria which oxidize reduced sulfur compounds to S°. - ᴛ∙nfrared and Raman spectra of K2SmO6 (m = 3-6) are reported. The photodecomposition of aqueous tetrathionate yields sulfite, thiosulfate, and polythionates with up to 9 sulfur atoms

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Section: Nature Of the "Elemental Sulfur" (S°) Produced By Certain Sumentioning

confidence: 75%

The Molecular Composition of Hydrophilic Sulfur Sols Prepared by Acid Decomposition of Thiosulfate [1]

Steudel

Göbel

Holdt

1988

Zeitschrift Für Naturforschung B

123

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“…Furthermore, polythionates with more than three sulfur atoms also react strongly with cyanide, giving the cyanolysis reaction described by Eq. 3 (Nietzel and De Sesa 1955;Kelly et al 1969;Szekeres 1974).…”

Section: Introductionmentioning

confidence: 99%

Speciation of Polysulfides and Zerovalent Sulfur in Sulfide-rich Water Wells in Southern and Central Israel

et al. 2008

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Zerovalent sulfur and inorganic polysulfides were determined in nine sulfiderich water wells in central and southern Israel. Although the two locations belong to the same aquifer, they are characterized by different pH and hydrogen sulfide levels. Hydrogen sulfide in the central Israel wells ranged between 19 and 32 lM, and the pH was 7.26 ± 0.07. The southern basin is characterized by lower water circulation, lower pH (around 6.8), and higher hydrogen sulfide levels ([470 lM). Polysulfides were determined by a rapid single-phase methylation using methyl trifluoromethanesulfonate (methyl triflate) reagent. The summary polysulfide concentration for S 4 2--S 7 2-species was found to be around 0.14-0.75 lM in the central region of Israel and substantially higher, 2.3-4.6 lM in the southern region. The sum of polysulfide zerovalent sulfur and colloidal sulfur was quantitatively detected by cyanide derivatization and compared to polysulfide sulfur determined by methyl triflate derivatization and to the chloroform extraction of zerovalent sulfur. A method for the determination of sulfur undersaturation level-the ratio between dissolved elemental sulfur and its equilibrium concentration in the presence of solid sulfur-based on the observed levels of the major polysulfide species is described. The observed polysulfide speciation was compared with the predicted speciation under sulfur saturation conditions taking into account the water temperature, its ionic strength, and pH. Criteria for sulfur saturation versus unsaturated conditions were established based on (1) the chain length dependence of the ratio between the observed polysulfide concentrations and their predicted value under sulfur saturated conditions, and (2) the difference between the concentration of zerovalent sulfur, as determined by cyanolysis, and the total polysulfide sulfur. According to this dual criterion five of the water wells were classified as being undersaturated with respect to sulfur, though for all the examined water wells the majority of the zerovalent sulfur was in the form of polysulfide sulfur.

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“…We have found these methods to be relatively insensitive for the analysis of the small amounts of these materials frequently encountered in experiments on bacterial sulfur compound oxidation (7)(8)(9), and that values obtained for trithionate in mixtures were not always reliable. Sensitive colorimetric methods for estimating thiosulfate and tetra-, penta-and hexathionates have been described (10)(11)(12)(13)(14)(15)(16), but no similar consideration appears to have been given to the colorimetric determination of trithionate. We have devised a sensitive method for estimating trithionate in mixtures, based on the procedures of Koh et al (10-13) and Sorbo (16).…”

Section: Resultsmentioning

confidence: 99%