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

Nobbs, J.McK.; Tizaoui, Chedly

doi:10.1080/01919512.2013.836956

Cited by 9 publications

(4 citation statements)

References 22 publications

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“…The linearity of the data indicates that ozone solubility in D5 is 1.769 mg L -1 in D5 per mg L -1 in gas at 25 °C. A similar value was found in the litterature (1.71 ± 0.09 mg L −1 in D5 per mg L −1 in gas) (Nobbs and Tizaoui 2014).…”

Section: Ozone Solubility In D5supporting

confidence: 84%

Two-Phase Ozonation for the Removal of Estrone, 17β-Estradiol and 17α-Ethinylestradiol in Water Using Ozone-Loaded Decamethylcyclopentasiloxane

Fredj

Novakoski

Tizaoui

et al. 2017

Ozone: Science & Engineering

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Ozonation has been proven effective for the removal of endocrine disrupting chemicals (EDCs) in water. However, conventional ozonation processesare still limited by ozone low solubility and stability in water. These limitations may be overcome by mixing a prior ozoneloaded non-polar solvent with the aqueous solution. This two-phase ozonation process combines Liquid-liquid extraction and Ozonation (LLO). Decamethylcyclopentasiloxane (D5) was chosen as the solvent to be charged with ozone for its non-toxicity, reusability and high ozone solubility. A concurrent LLO column reactor was designed for the simultaneous degradation of three endocrine disrupting chemicals (EDCs) in water: Estrone (E1), 17βestradiol (E2) and 17α-estradiol (EE2). Results showed that 98% of EDCs were removed effectively from a solution initially concentrated at 1 mg L-1. The efficacy of the degradation depends essentially of the column feeding flow rate, the ozone dose and the operating pH. The generation of byproducts during EDCs degradation by LLO was also investigated in this study. For a complete removal of both EDCs and byproducts, the dose of ozone had to be doubled.

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Section: Ozone Solubility In D5supporting

confidence: 84%

Two-Phase Ozonation for the Removal of Estrone, 17β-Estradiol and 17α-Ethinylestradiol in Water Using Ozone-Loaded Decamethylcyclopentasiloxane

Fredj

Novakoski

Tizaoui

et al. 2017

Ozone: Science & Engineering

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“…O 3 can reduce indigo trisulfuric potassium (C 16 H 7 N 2 O 2 (SO 3 K) 3 ) solutions into the clear colorless state, so the UV‐vis spectrophotometer at a wavelength of 600 nm was used for Ozone quantitative determination. [ 27 ] First, 0.077 g indigo trisulfuric potassium (C 16 H 7 N 2 O 2 (SO 3 K) 3 ) was added to the quartz beaker, followed by the addition of 500‐ml DIW and 1‐ml phosphoric acid. Second, 10 g sodium dihydrogen phosphate and 7‐ml phosphoric acid were added to the quartz beaker, followed by the addition of a 100‐ml mixed indigo trisulfuric potassium solution.…”

Section: Experimental Setups and Methodsmentioning

confidence: 99%

Nanosecond‐pulsed microbubble plasma reactor for plasma‐activated water generation and bacterial inactivation

Man

Zhang

Fang

et al. 2022

Plasma Processes & Polymers

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“…reactor headspace) was measured using a modified indigo trisulphonate method. Briefly, a 2 mL potassium indigo trisulphonate solution ( Nobbs and Tizaoui, 2014 ) were withdrawn in a 10 mL syringe followed by the withdrawal of 8 mL of the ozone-containing gas from the reactor. The gas/liquid mixture was then thoroughly shaken and the change in absorbance at 600 nm of the indigo solution before and after exposure to ozone was measured using a UV/Vis spectrophotometer (Cary 60, Agilent).…”

Section: Methodsmentioning

confidence: 99%

Ozone for SARS-CoV-2 inactivation on surfaces and in liquid cell culture media

Tizaoui

Stanton

Statkute

et al. 2022

Journal of Hazardous Materials

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This study evaluated the inactivation of SARS-CoV-2, the virus responsible for COVID-19, by ozone using virus grown in cell culture media either dried on surfaces (plastic, glass, stainless steel, copper, and coupons of ambulance seat and floor) or suspended in liquid. Treatment in liquid reduced SARS-CoV-2 at a rate of 0.92±0.11 log 10 -reduction per ozone CT dose(mg.min/L); where CT is ozone concentration times exposure time. On surface, the synergistic effect of CT and relative humidity (RH) was key to virus inactivation; the rate varied from 0.01 to 0.27 log 10 -reduction per ozone CT value(g.min/m 3 ) as RH varied from 17% to 70%. Depletion of ozone by competitive reactions with the medium constituents, mass transfer limiting the penetration of ozone to the bulk of the medium, and occlusion of the virus in dried matrix were postulated as potential mechanisms that reduce ozone efficacy. RH70% was found plausible since it provided the highest disinfection rate while being below the critical RH that promotes mould growth in buildings. In conclusion, through careful choice of (CT, RH), gaseous ozone is effective against SARS-CoV-2 and our results are of significance to a growing field where ozone is applied to control the spread of COVID-19.

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

Cited by 9 publications

References 22 publications

Two-Phase Ozonation for the Removal of Estrone, 17β-Estradiol and 17α-Ethinylestradiol in Water Using Ozone-Loaded Decamethylcyclopentasiloxane

Two-Phase Ozonation for the Removal of Estrone, 17β-Estradiol and 17α-Ethinylestradiol in Water Using Ozone-Loaded Decamethylcyclopentasiloxane

Nanosecond‐pulsed microbubble plasma reactor for plasma‐activated water generation and bacterial inactivation

Ozone for SARS-CoV-2 inactivation on surfaces and in liquid cell culture media

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