Oxygen consumption in two aqueous systems: excited nitrite ions-oxygen and nitrite ions-singlet oxygen

Bilski, Piotr; Szychlinski, J.; Oleksy, E.

doi:10.1016/s1010-6030(98)80001-4

Cited by 13 publications

(12 citation statements)

References 43 publications

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“…In D 2 0 , azide reduced oxygen consumption by only %%, while in water, oxygen consumption decreased only slightly (Table 1). Although azide ions alone have been shown to consume oxygen during photosensitization experiments (Bilski et al, 1988), in the present study we ascertained that azide photo-oxidation was negligible compared with photo-oxidation of DEHA (data not shown). The striking difference in azide influence between acetonitrile and water implies a significant difference in mechanism, and suggests that there is considerable '02 formation in acetonitrile.…”

Section: Oxygen Consumption and H 2 0 2 Formationmentioning

confidence: 48%

The Photo‐oxidation of N, N‐diethylhydroxylamine by Rose Bengal in Acetonitrile and Water

Bilski

Chignell

1991

Photochem & Photobiology

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The Rose Bengal photosensitized oxidation of N,N-diethylhydroxylamine has been investigated in water and acetonitrile using the techniques of oxygen uptake, singlet oxygen phosphorescence and electron spin resonance. In both solvents H,02 is the major oxidation product and diethylnitroxide is an intermediate. In water, superoxide dismutase decreases oxygen uptake suggesting involvement of superoxide anions in the oxidation process. Results indicate that in water the photo-oxidation proceeds mainly by a Type I(electron transfer) mechanism, while in acetonitrile a Type II(energy transfer) mechanism has been confirmed (Encinas et al., 1987, J . Chem. SOC. Perkin Trans. IZ, 1125-1 127).

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Section: Oxygen Consumption and H 2 0 2 Formationmentioning

confidence: 48%

The Photo‐oxidation of N, N‐diethylhydroxylamine by Rose Bengal in Acetonitrile and Water

Bilski

Chignell

1991

Photochem & Photobiology

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“…Nitroso and nitro products can be generated through photoreaction of nitrite with phenols or other aromatic compounds (Bilski et al 1988). Nitrite may react in the environment or in foods with secondary amines to form N-nitrosamines which (2000) n.s.…”

Section: Mechanisms Of Nitrite Toxicitymentioning

confidence: 99%

Origin, causes and effects of increased nitrite concentrations in aquatic environments

Philips

Laanbroek

Verstraete

2002

Rev Environ Sci Biotechnol

312

198

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Literature frequently mentions increased nitrite concentrations along with its inhibitory effect towards bacteria and aquatic life. Nitrite accumulation has been studied for decades, and although numerous causal factors have already been commented on in literature, the mechanism of nitrite accumulation is not always clear. From the broad range of parameters and environmental factors reviewed in this paper, it is obvious that the causes and consequences of nitrite accumulation are not yet completely understood. Among others, pH, dissolved oxygen, volatile fatty acids, phosphate and reactor operation have been found to play a role in nitrite accumulation, which results from differential inhibition or disruption of the linkage of the different steps in both nitrification and denitrification. In the case of nitrification, this differential inhibition could lead to the displacement or unlinking of the ammonia oxidisers and nitrite oxidisers. In this paper, the idea is formulated that the nitrifier population forms a role model for the total microbial community. Increased nitrite concentrations would in this aspect not only signal a disruption of nitrifiers, but possibly also of the total configuration of the microbial community.Abbreviations: AMO -Ammonia mono-oxygenase; Anammox -Anaerobic ammonium oxidation; AOBAmmonia-oxidising bacteria; ATP -Adenosine triphosphate; COD -Chemical oxygen demand; DNRA -Dissimilatory nitrate reduction to ammonium; DO -Dissolved oxygen; EU -European union; FA -Free ammonia; F/M -Food to micro-organism ratio; FNA -Free nitrous acid; HAO -Hydroxylamine oxidoreductase; HRTHydraulic residence time; NDBEPR -Enhanced biological phosphate removal with nitrification and denitrification; NO -Nitric oxide; NOB -Nitrite-oxidising bacteria; NOR -Nitrite oxidoreductase; OLAND -Oxygen limited autotrophic nitrification denitrification; RBC -Rotating biological contactor; Sharon -Single reactor high activity ammonia removal over nitrite; SRT -Sludge residence time; TAN -Total ammoniacal nitrogen; TOC -Total organic carbon; VAS -Volatile attached solids

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“…The bands at 360 and 280 nm are attributed to the n → π* and π → π* transitions, respectively . The photolysis of NO 2 – in aqueous solution has been investigated by probing the transient NO with electron spin resonance (EPR), oxygen consumption using an electrochemical oxygen sensor, steady-state ultraviolet–visible absorption, , and transient absorption. , OH, NO, and hydroxyl ion (OH – ) are the major photolytic products, ,,,, The quantum yield of OH upon ca. 350 nm excitation of NO 2 – at room temperature and pH = 6–8 is within 3–5%. ,, The channel to instantaneously generate nitrogen dioxide (NO 2 ) and solvated electrons (e aq – ) is almost ignorable .…”

Section: Introductionmentioning

confidence: 99%

“…The bands at 360 and 280 nm are attributed to the n → π* and π → π* transitions, respectively. 19 The photolysis of NO 2 − in aqueous solution has been investigated by probing the transient NO with electron spin resonance (EPR), 20 oxygen consumption using an electrochemical oxygen sensor, 21 steady-state ultraviolet− visible absorption, 22,23 and transient absorption. 24,25 OH, NO, and hydroxyl ion (OH − ) are the major photolytic products, 20,21,23,26,27…”

Section: ■ Introductionmentioning

confidence: 99%

Infrared Spectroscopic and Kinetic Characterization on the Photolysis of Nitrite in Alcohol-Containing Aqueous Solutions

2020

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Nitrite is regarded as a potential OH and NO precursor in aqueous solution upon ultraviolet photolysis. A step-scan Fourier-transform interferometer was employed to collect the transient infrared difference spectra upon excitation of the sodium nitrite aqueous solution in the presence of methanol and ethanol upon 355 nm pulsed excitation. The photolytic intermediates were proposed to be NO and NO2 via the direct dissociation from NO2 – and the rapid reaction of OH and NO2 –, respectively. Coupled with the theoretical calculations of the absolute energies and harmonic wavenumbers of relevant species using B3LYP density functional theory with the C-PCM model to account for the medium effect of H2O, a transient band at 1860–2030 cm–1 could be attributed to dissolved N2O3 isomers that could be quickly generated from NO + NO2. On the basis of the predicted thermodynamics, the reactions of alcohols with N2O3 were less thermodynamically favorable than that of water, resulting in a slightly decelerated depletion rate of N2O3 in alcohol-containing aqueous solution. Comparing the transient population of N2O3 in the absence and presence of CH3OH or C2H5OH, the upper-bound bimolecular rate coefficient of NO or NO2 with alcohols is reported as 7.3 × 103 M–1 s–1 for the first time. The spectroscopic and kinetic evidence of the reactivity of alcohols with NO, NO2, and N2O3 are provided to augment the roles of alcohols and N x O y in solution or in aqueous aerosol photochemistry.

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Oxygen consumption in two aqueous systems: excited nitrite ions-oxygen and nitrite ions-singlet oxygen

Cited by 13 publications

References 43 publications

The Photo‐oxidation of N, N‐diethylhydroxylamine by Rose Bengal in Acetonitrile and Water

The Photo‐oxidation of N, N‐diethylhydroxylamine by Rose Bengal in Acetonitrile and Water

Origin, causes and effects of increased nitrite concentrations in aquatic environments

Infrared Spectroscopic and Kinetic Characterization on the Photolysis of Nitrite in Alcohol-Containing Aqueous Solutions

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