Basis and optimization of the indooxine method to determine oximes

Palling, David J.; Hollocher, Thomas C.

doi:10.1007/bf01197812

Cited by 6 publications

(7 citation statements)

References 12 publications

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“…Analysis of hydroxylamine was carried out using the 8-hydroxyquinoline method . Briefly, 0.5 mL of 1% 8-hydroxyquinoline in ethanol and 0.5 mL of 1 M Na 2 CO 3 were added to a 1 mL sample.…”

Section: Methodsmentioning

confidence: 99%

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Nitrite Reduction to Nitrous Oxide and Ammonia by TiO₂ Electrons in a Colloid Solution via Consecutive One-Electron Transfer Reactions

et al. 2016

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The mechanism of nitrite reduction by excess electrons on TiO2 nanoparticles (eTiO2(-)) was studied under anaerobic conditions. TiO2 was loaded with up to 75 electrons per particle, induced by γ-irradiation of acidic TiO2 colloid solutions containing 2-propanol. Time-resolved kinetics and material analysis were performed, mostly at 1.66 g L(-1) TiO2. At relatively low nitrite concentrations (R = [eTiO2(-)]o/[nitrite]o > 1.5), eTiO2(-) decays via two consecutive processes; at higher concentrations, only one decay step is observed. The stoichiometric ratio Δ[eTiO2(-)]/[nitrite]o of the faster process is about 2. This process involves the one-electron reduction of nitrite, forming the nitrite radical (k1 = (2.0 ± 0.2) × 10(6) M(-1) s(-1)), which further reacts with eTiO2(-) (k2) in competition with its dehydration to nitric oxide (NO) (k3). The ratios k2/k3 = (3.0 ± 0.5) × 10(3) M(-1) and k2 > 1 × 10(6) M(-1) s(-1) were derived from kinetic simulations and product analysis. The major product of this process is NO. The slower stage of the kinetics involves the reduction of NO by eTiO2(-), and the detailed mechanism of this process has been discussed in our earlier publication. The results reported in this study suggest that several intermediates, including NO and NH2OH, are adsorbed on the titanium nanoparticles and give rise to inverse dependency of the respective reaction rates on the TiO2 concentration. It is demonstrated that the reduction of nitrite by eTiO2(-) yields mainly N2O and NH3 via consecutive one-electron transfer reactions.

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Section: Methodsmentioning

confidence: 99%

“…Analysis of hydroxylamine was carried out using the 8hydroxyquinoline method. 19 Briefly, 0.5 mL of 1% 8hydroxyquinoline in ethanol and 0.5 mL of 1 M Na 2 CO 3 were added to a 1 mL sample. The absorption at 708 nm was monitored after incubation for 5 min at 95 °C and subsequent cooling.…”

mentioning

confidence: 99%

Nitrite Reduction to Nitrous Oxide and Ammonia by TiO₂ Electrons in a Colloid Solution via Consecutive One-Electron Transfer Reactions

et al. 2016

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“…Hydroxylamine was determined according to Palling and Hollocher (1985). For analysis of NO and NO 2 , an NO x -Analyzer (CLD 700 EL; Eco Physics, Dürnten, Switzerland) was used.…”

Section: Analytical Proceduresmentioning

confidence: 99%

High rate of aerobic nitrification and denitrification by Nitrosomonas eutropha grown in a fermentor with complete biomass retention in the presence of gaseous NO 2 or NO

Zart

Bock

1998

Archives of Microbiology

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A pure culture of the obligately lithoautotrophic ammonia-oxidizer Nitrosomonas eutropha was grown in a laboratory-scale bioreactor with complete biomass retention. The air supply was supplemented with nitrogen dioxide (NO2; 25 or 50 ppm) or nitric oxide (NO; 25 or 50 ppm). Compared to cultures grown without these nitrogenous oxides, the addition of NO2 or NO to the culture resulted in a significant increase of the nitrification rate, specific activity of ammonia oxidation, growth rate, and maximum cell densities. In contrast, the growth yield slightly decreased in the presence of NO or NO2. Maximum cell densities of about 2 x 10(10) cells ml-1 and a maximum nitrification rate of about 221 mmol NH4+ l-1 day-1 were obtained after 3 weeks in the presence of 50 ppm NO2. Furthermore, in the stationary phase about 50% of the nitrite produced was aerobically denitrified to dinitrogen (N2) and traces of nitrous oxide (N2O). When cells were supplemented with NO, a high rate of aerobic denitrification occurred only during the first days of the exponential growth phase.

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“…A spectrophotometric method for oximes has been studied and optimized. The method is based on liberation of hydroxylamine from the oxime by acid hydrolysis, followed by reaction of the hydroxylamine with 8-quinolinol to give an indooxine dye (248).…”

Section: Oximesmentioning

confidence: 99%

Functional group analysis

Smith¹,

Patterson²

1988

Anal. Chem.

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Basis and optimization of the indooxine method to determine oximes

Cited by 6 publications

References 12 publications

Nitrite Reduction to Nitrous Oxide and Ammonia by TiO₂ Electrons in a Colloid Solution via Consecutive One-Electron Transfer Reactions

Nitrite Reduction to Nitrous Oxide and Ammonia by TiO₂ Electrons in a Colloid Solution via Consecutive One-Electron Transfer Reactions

High rate of aerobic nitrification and denitrification by Nitrosomonas eutropha grown in a fermentor with complete biomass retention in the presence of gaseous NO 2 or NO

Functional group analysis

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Basis and optimization of the indooxine method to determine oximes

Cited by 6 publications

References 12 publications

Nitrite Reduction to Nitrous Oxide and Ammonia by TiO2 Electrons in a Colloid Solution via Consecutive One-Electron Transfer Reactions

Nitrite Reduction to Nitrous Oxide and Ammonia by TiO2 Electrons in a Colloid Solution via Consecutive One-Electron Transfer Reactions

High rate of aerobic nitrification and denitrification by Nitrosomonas eutropha grown in a fermentor with complete biomass retention in the presence of gaseous NO 2 or NO

Functional group analysis

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Product

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Nitrite Reduction to Nitrous Oxide and Ammonia by TiO₂ Electrons in a Colloid Solution via Consecutive One-Electron Transfer Reactions

Nitrite Reduction to Nitrous Oxide and Ammonia by TiO₂ Electrons in a Colloid Solution via Consecutive One-Electron Transfer Reactions