Spectrophotometric determination of ozone in solutions: Molar absorption coefficient in the visible region

Ершов, Б. Г.; Panich, N. M.

doi:10.1016/j.saa.2019.03.038

Cited by 6 publications

(9 citation statements)

References 33 publications

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“…Establishing their molecular structures would require tandem mass spectrometric studies. The presence of chloride in the m/ z 237/239 and other species is revealed by the characteristic 3to-1 ratio of 237/239 signal intensities, which corresponds to the ratio of natural abundance 35 Cl/ 37 Cl chlorine isotopes. We also detect species at m/z 221/223 (P1) and 246/248 (P2) (see below) at longer reaction times (Figure 1B).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…at 1 L/min flow rate (set by a digital mass flow controller) for 5−20 s. O 3 concentrations in the sparged solutions, [O 3 (sol)], were determined by UV−vis spectroscopy (Agilent 8453) based on the reported O 3 molar extinction coefficient in the near-UV of ε 258 nm = 3840 M −1 cm −1 in water, 34 which is expected to be largely unaffected by the presence of AN. 35 Reactions were initiated by mixing terpene and ozone solutions (2.5 mL each) in a glass syringe (5 mL) covered with aluminum foil to avoid their photodegradation. To minimize unwanted secondary reactions, terpene concentrations were always in excess:…”

Section: ■ Introductionmentioning

confidence: 99%

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Stability of Monoterpene-Derived α-Hydroxyalkyl-Hydroperoxides in Aqueous Organic Media: Relevance to the Fate of Hydroperoxides in Aerosol Particle Phases

Qiu

Liang

Tonokura

et al. 2020

Environ. Sci. Technol.

112

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The -hydroxyalkyl-hydroperoxides [R-(H)C(-OH)(-OOH), -HH] produced in the ozonolysis of unsaturated organic compounds may contribute to SOA aging. -HHs inherent instability, however, hampers their detection and a positive assessment of their actual role. Here we report, for the first time, the rates and products of the decomposition of the -HHs generated in the ozonolysis of atmospherically important monoterpenes -pinene (-P), dlimonene (d-L), -terpinene (-Tn) and -terpineol (-Tp) in water:acetonitrile (W:AN) mixtures. We detect -HHs and multifunctional decomposition products as chloride-adducts by online electrospray ionization mass spectrometry. Experiments involving D 2 O and H 2 18 O instead of H 2 16 O, and an OH-radical scavenger show that -HHs decompose into gem-diols + H 2 O 2 rather than free radicals. -HHs decay mono-or bi-exponentially depending on molecular structure and solvent composition. e-fold times,  1/e , in water-rich solvent mixtures range from  1/e = 15-45 min for monoterpene-derived -HHs to  1/e > 10 3 min for the -Tp

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Stability of Monoterpene-Derived α-Hydroxyalkyl-Hydroperoxides in Aqueous Organic Media: Relevance to the Fate of Hydroperoxides in Aerosol Particle Phases

Qiu

Liang

Tonokura

et al. 2020

Environ. Sci. Technol.

112

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“…For example, ELT is suitable to neutralize toxic and carcinogenic organochlorine impurities such as dichloroethane, trichloroethane, trichlorethylene, tetrachlorethylene, chlorobenzene, chlorophenols, dichlorophenols, pentachlorophenols or some others. ,,,,− In the presence of organochlorine impurities, the synergistic effect of the combined use of radiolysis and ozonolysis is most often observed. ,,− Ozone is inevitably formed due to the radiolysis of air between the beam window of the accelerator and the flow of water subjected to irradiation. Due to the high oxidizing ability (Figure ), ozone itself is a very effective means of disinfecting impurities in water; − therefore, radiolytic ozone is advisible for use in enhancing the radiolytic treatment of water. However, it must be borne in mind that ozonation often interferes with the coagulation of dispersed compounds.…”

Section: Combined Application Of Treatment Methodsmentioning

confidence: 99%

The Green Method in Water Management: Electron Beam Treatment

Пономарев

Ершов

2020

Environ. Sci. Technol.

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During the prebiotic era, radiolytic transformations in the oceans played a key role in purifying water from toxic impurities and, thus, played a role in the formation of the aquatic environment of our planet, making it suitable for the emergence of life. Today, the planet again faces the challenge of how to provide people with clean water. Therefore, it is reasonable to look back at past historical stages and again consider the possibility of neutralizing pollutants in water by means of radiolysis, which has already been tested by time. Modern radiolytic treatments can be much faster and safer thanks to the advent of powerful electron accelerators and high-rate electron beam treatment (ELT) of water and wastewater. Radiolytic treatment of water using accelerated electrons corresponds to the essence of advanced oxidative technologies and green chemistry. The ELT of water instantly generates a high concentration of short-lived radicals that can quickly neutralize and decompose chemical and bacterial pollutants. Due to the ability of accelerated electrons to penetrate into a substance, ELT provides the decomposition of both dissolved and suspended pollutants. The cleaning effect of ELT is due to the ability to inactivate toxic and chromophore functional groups, transform impurities into an easily removable form, damage the DNA of microorganisms and their spore forms, and increase the biodegradability of organic impurities. The use of ELT in water treatment provides significant savings in chemical reagents, thereby improving quality and reducing the number of cleaning steps. The compactness, high degree of automation of the equipment used, energy efficiency, high productivity, and excellent compatibility with traditional water treatment methods are important advantages of ELT. Unlike conventional chemicals, the excess radicals generated in the ELT process are converted back to water and hydrogen; thus, the chemical and corrosive activity of water does not increase. Equipping research institutes with electron accelerators, developing cheaper accelerators, and granting government support for pilot projects are key conditions for introducing ELT into water treatment practice.

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“…The following values are obtained: λ max (ε) = 600 nm (8.0 � 0.3 mol À 1 L cm À 1 ) for CCl 4 and λ max (ε) = 588 nm (5.1 � 0.1 mol À 1 L cm À 1 ) for CH 3 CN, whereas for gaseous ozone λ max (ε) = 603 nm (1.32 � 0.1 mol À 1 L cm À 1 ). [25] Thus, in the polar (CH 3 CN) and nonpolar (CCl 4 ) liquids, the molar absorption coefficient of ozone differs from that in the gas (the mixture with oxygen) by factors of 4 and 6, respectively. The oscillator strength in the visible range of the ozone absorption in CCl 4 was calculated [28,29] ; it was ∼ 6 times higher compared to the gas phase.…”

Section: Optical Absorption Of Ozone In Ch 3 Cn and CCLmentioning

confidence: 99%

Ozone in Polar (Acetonitrile) and Nonpolar (Carbon Tetrachloride) Organic Liquids: Optical Absorption, Solubility, and Stability

Ершов

Panich

2022

ChemistrySelect

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The optical characteristics, solubility, and decomposition kinetics of ozone in polar (acetonitrile, CH 3 CN) and nonpolar (carbon tetrachloride, CCl 4 ) liquids in the temperature range 233.15-295.15 K were studied. The rate constants of the O 3 decomposition at 295.15 K in CH 3 CN and CCl 4 are 3.3 × 10 À 5 and 5.0 × 10 À 5 s À 1 , respectively. At low temperatures, ozone solu-tions are practically stable. The solubility coefficients at 295.15 K are 2.6 in CH 3 CN and 2.9 in CCl 4 ; at 233.15 K, they increase to approximately 7.0. Thus, these two liquids have a set of properties making them optimum for studying the ozonolysis in polar and nonpolar media.

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Spectrophotometric determination of ozone in solutions: Molar absorption coefficient in the visible region

Cited by 6 publications

References 33 publications

Stability of Monoterpene-Derived α-Hydroxyalkyl-Hydroperoxides in Aqueous Organic Media: Relevance to the Fate of Hydroperoxides in Aerosol Particle Phases

Stability of Monoterpene-Derived α-Hydroxyalkyl-Hydroperoxides in Aqueous Organic Media: Relevance to the Fate of Hydroperoxides in Aerosol Particle Phases

The Green Method in Water Management: Electron Beam Treatment

Ozone in Polar (Acetonitrile) and Nonpolar (Carbon Tetrachloride) Organic Liquids: Optical Absorption, Solubility, and Stability

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