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A Modified Indigo Method for the Determination of Ozone in Nonaqueous Solvents

J. Nobbs, C. Tizaoui, Chedly Tizaoui Orcid Logo

Ozone: Science & Engineering, Volume: 36, Issue: 1, Pages: 110 - 120

Swansea University Author: Chedly Tizaoui Orcid Logo

DOI (Published version): 10.1080/01919512.2013.836956

Abstract

The indigo method for the analysis of aqueous ozone was modified to allow analysis of dissolved ozone in nonaqueous liquid phases. The method was tested using the solvent decamethylcyclopentasiloxane 245 and a vegetable oil. The molar absorptivity at 600 nm of the indigo trisulphonate molecule was r...

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Published in: Ozone: Science & Engineering
Published: 2014
URI: https://cronfa.swan.ac.uk/Record/cronfa20190
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spelling 2018-04-29T13:45:47.5979471 v2 20190 2015-02-22 A Modified Indigo Method for the Determination of Ozone in Nonaqueous Solvents 4b34a0286d3c0b0b081518fa6987031d 0000-0003-2159-7881 Chedly Tizaoui Chedly Tizaoui true false 2015-02-22 CHEG The indigo method for the analysis of aqueous ozone was modified to allow analysis of dissolved ozone in nonaqueous liquid phases. The method was tested using the solvent decamethylcyclopentasiloxane 245 and a vegetable oil. The molar absorptivity at 600 nm of the indigo trisulphonate molecule was re-checked and found to be 20,069 ± 412 L mol−1 cm−1 which is in agreement with the generally accepted value. Linear correlation between liquid phase and gas phase ozone concentrations confirmed that ozone solubility in decamethylcyclopentasiloxane 245 obeyed Henry's law with a constant of 1.71 ± 0.09 mg L−1 per mg L−1 in the gas phase. Ozone solubility in the vegetable oil followed a power law model with k = 0.148 and n = 0.767 (liquid and gas phase concentrations in mg L−1). The stoichiometry of the reaction between ozone in the nonaqueous phase and indigo trisulfonate in acidic solution was also confirmed as being about one. Moreover, the reaction products were confirmed by chromatographic analysis. This method was found effective to analyze ozone in nonaqueous solvents with a lower limit of detection of 2.6 μg L−1 and upper limit of detection of 142.7 mg L−1. Journal Article Ozone: Science & Engineering 36 1 110 120 Ozone, Indigo Method, Decamethylcyclopentasil-oxane, Vegetable Oil, Two-Phase Ozonation, Indigo Trisulfonate, Isatin-5-Sulfonic Acid, Isatin-Disulfonic Acid, Solvents Containing Ozone, Ozone-Loaded Solvent 31 12 2014 2014-12-31 10.1080/01919512.2013.836956 COLLEGE NANME Chemical Engineering COLLEGE CODE CHEG Swansea University 2018-04-29T13:45:47.5979471 2015-02-22T16:46:14.0132951 College of Engineering Engineering J. Nobbs 1 C. Tizaoui 2 Chedly Tizaoui 0000-0003-2159-7881 3 0020190-18102015124009.pdf 2015_OzoneAnalysisNonAqueousSolvents_OSE_CTizaoui.pdf 2015-10-18T12:40:09.7570000 Output 225416 application/pdf Accepted Manuscript true 2015-10-18T00:00:00.0000000 false
title A Modified Indigo Method for the Determination of Ozone in Nonaqueous Solvents
spellingShingle A Modified Indigo Method for the Determination of Ozone in Nonaqueous Solvents
Chedly Tizaoui
title_short A Modified Indigo Method for the Determination of Ozone in Nonaqueous Solvents
title_full A Modified Indigo Method for the Determination of Ozone in Nonaqueous Solvents
title_fullStr A Modified Indigo Method for the Determination of Ozone in Nonaqueous Solvents
title_full_unstemmed A Modified Indigo Method for the Determination of Ozone in Nonaqueous Solvents
title_sort A Modified Indigo Method for the Determination of Ozone in Nonaqueous Solvents
author_id_str_mv 4b34a0286d3c0b0b081518fa6987031d
author_id_fullname_str_mv 4b34a0286d3c0b0b081518fa6987031d_***_Chedly Tizaoui
author Chedly Tizaoui
author2 J. Nobbs
C. Tizaoui
Chedly Tizaoui
format Journal article
container_title Ozone: Science & Engineering
container_volume 36
container_issue 1
container_start_page 110
publishDate 2014
institution Swansea University
doi_str_mv 10.1080/01919512.2013.836956
college_str College of Engineering
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hierarchy_top_id collegeofengineering
hierarchy_top_title College of Engineering
hierarchy_parent_id collegeofengineering
hierarchy_parent_title College of Engineering
department_str Engineering{{{_:::_}}}College of Engineering{{{_:::_}}}Engineering
document_store_str 1
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description The indigo method for the analysis of aqueous ozone was modified to allow analysis of dissolved ozone in nonaqueous liquid phases. The method was tested using the solvent decamethylcyclopentasiloxane 245 and a vegetable oil. The molar absorptivity at 600 nm of the indigo trisulphonate molecule was re-checked and found to be 20,069 ± 412 L mol−1 cm−1 which is in agreement with the generally accepted value. Linear correlation between liquid phase and gas phase ozone concentrations confirmed that ozone solubility in decamethylcyclopentasiloxane 245 obeyed Henry's law with a constant of 1.71 ± 0.09 mg L−1 per mg L−1 in the gas phase. Ozone solubility in the vegetable oil followed a power law model with k = 0.148 and n = 0.767 (liquid and gas phase concentrations in mg L−1). The stoichiometry of the reaction between ozone in the nonaqueous phase and indigo trisulfonate in acidic solution was also confirmed as being about one. Moreover, the reaction products were confirmed by chromatographic analysis. This method was found effective to analyze ozone in nonaqueous solvents with a lower limit of detection of 2.6 μg L−1 and upper limit of detection of 142.7 mg L−1.
published_date 2014-12-31T03:30:26Z
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