Flow-Through Chronopotentiometry in Waste Water Analysis

Beinrohr, Ernest

doi:10.5772/16065

Cited by 5 publications

(5 citation statements)

References 30 publications

(26 reference statements)

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“…Cr(III) and the total amount of chromium species in the solution were determined by the method of interelectrode coulometric titration. This electroanalytical method was developed and described by Beinrohr et al 2 for the analysis of aqueous solutions. The total amount of chromium species was checked by AAS.…”

Section: Cr(ii) Experiments-mentioning

confidence: 99%

Solubility of Cr Species in Low Temperature Cryolite-Based Electrolyte at 900°C

Danielik

Fellner

Šuleková

et al. 2013

J. Electrochem. Soc.

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Oxidation and reduction of Cr(III) species originating from dissolution of Cr2O3 in cryolite-based melts at 900°C was studied. The molar ratio n(NaF)/n(AlF3) was 1.4, which allowed us to perform electrochemical measurements at 900°C. Cr(II) species were prepared in situ by the reduction of Cr2O3 with chromium powder. Saturation was achieved after several hours, the concentration of Cr(II) being (237 ± 11) wt ppm. Cr(III) can be oxidized to Cr(VI) both chemically by oxygen present in the air and electrochemically when using an inert anode. When a carbon anode was used, the formation of Cr(VI) species was not observed. The solubility of Cr(VI) species in the above-mentioned melt was found to be (1395 ± 22) wt ppm at a total amount of Cr species in the melt of (1574 ± 16) wt ppm.

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Section: Cr(ii) Experiments-mentioning

confidence: 99%

Solubility of Cr Species in Low Temperature Cryolite-Based Electrolyte at 900°C

Danielik

Fellner

Šuleková

et al. 2013

J. Electrochem. Soc.

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“…In both cases the melt was saturated with alumina. Analysis of the melt for chromium (VI) was made by using the method of interelectrode coulometric titration (2).…”

Section: Introductionmentioning

confidence: 99%

Behaviour of Cr Species in the Molten System NaF - AlF₃ - (Al₂O₃)

et al. 2013

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Oxidation and reduction of Cr(III) species originating from dissolution of Cr2O3 in cryolite-based melts at 900 {degree sign}C was studied. The molar ratio n(NaF)/n(AlF3) was 1.4, which allowed us to perform measurements at the temperature of 900 {degree sign}C. It was found that Cr(III) can be oxidized to Cr(VI) both chemically by oxygen present in the air and electrochemically when using an inert anode. When a carbon anode was used, the formation of Cr(VI) species was not observed. The solubility of Cr(VI) species in the above-mentioned melt was found to be (1570 {plus minus} 16) ppm. Cr(II) species were prepared in situ by the reduction of Cr2O3 with chromium powder. It was found that saturation was achieved after several hours, the concentration of Cr(II) being (239 {plus minus} 14) ppm.

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“…Their large surface and small void volume facilitate direct coulometric titrations [32]. The goal of this paper is to demonstrate the utility of such electrode materials for a simple and fast determination of hydrazine in water samples.…”

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confidence: 99%