Estimation of individual thio-salts and sulphate in flotation mill solutions

Rolia, E; Barbeau, F

doi:10.1016/0039-9140(80)80187-1

Cited by 11 publications

(5 citation statements)

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“…l/T (K)) were made for decomposition of tetrathionate in the temperature range 15-45 °C at pH 11.0. The activation energy was calculated by using regression line values for ki and k2 from the relationship -Ea = (dn -In k2')/(l/T2 -l/T¿) (5) At pH 11.0, Ea has the value 115.5 kJ mol"1. The preexponential factor, A, of the Arrhenius equation is obtained from the relationship lnfe' = In A-EJRT!…”

Section: Resultsmentioning

confidence: 99%

“…Thiosulfate and polythionates were determined spectrophotometrically (5). An autoclave manufactured by Parr Instrument Co. was used to determine the effect of high temperatures and high oxygen pressures on the rate of thiosulfate oxidation.…”

Section: Methodsmentioning

confidence: 99%

“…A weighed quantity of the potassium tetrathionate gave a clear solution in distilled water. The solution was analyzed spectrophotometrically (5). The potassium tetrathionate was found to be 100 ±1% pure.…”

Section: Methodsmentioning

confidence: 99%

“…The polycyclic aromatic hydrocarbons are environmentally ubiquitous compounds, which are produced by combustion of fossil fuels and certain industrial processes such as coke production and petroleum refining. Emissions from fossil fuel combustion can vary over several orders of magnitude depending upon the particular fuel and combustion conditions (1,5). Emissions of PAH per BTU from coal or wood burning for residential space heating are several orders of magnitude greater than for gas or oil burning (1,5).…”

Section: Introductionmentioning

confidence: 99%

“…Emissions from fossil fuel combustion can vary over several orders of magnitude depending upon the particular fuel and combustion conditions (1,5). Emissions of PAH per BTU from coal or wood burning for residential space heating are several orders of magnitude greater than for gas or oil burning (1,5). Thus, the trend toward increased use of coal and wood in the United States can have a substantial impact on the concentrations on airborne PAH.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of decomposition of tetrathionate, trithionate, and thiosulfate in alkaline media

Rolia¹,

Chakrabarti²

1982

Environ. Sci. Technol.

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hydrolysis rate constant of 2,4-DOE were observed. These observations are mutually consistent with a rapid, reversible partitioning of 2,4-DOE between water and "dissolved" humic substances. The humic-bound 2,4-DOE is not adsorbed to glass and is protected from alkaline hydrolysis. On the basis of this model, with aquatic humus concentrations expressed as g of C/g of H20, the distribution coefficient of 2,4-DOE between water and aquatic humus (Kb) was calculated from both the glass adsorption data and the alkaline hydrolysis data, yielding log Kb values of 4.4 and 4.8, respectively.From the magnitude of the distribution coefficient of 2,4-DOE between water and "dissolved" humic substances, a significant interaction is generally expected for hydrophobic compounds in natural waters. Rates of alkaline hydrolysis, volatilization, etc., would be expected to be reduced in proportion to the fraction of a hydrophobic solute that is associated with humic substances.If any general acid-base catalysis of the hydrolysis reaction is attributable to humic substances, that contribution is completely masked by the partitioning phenomenon, which strongly decreases the rate of alkaline hydrolysis of 2,4-DOE.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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