Thermometric determination of CuIIbased on its catalytic effect on the oxidation of hydroxylamine by dissolved oxygen

Gómez, E.; Estela, José Manuel; Cerdà, Vı́ctor

doi:10.1016/0040-6031(90)80225-n

Cited by 9 publications

(3 citation statements)

References 6 publications

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“…The hydroxylamine signal was stable in air for at least two hours (Figure S14). Introduction of a low concentration (7.3 μM) of Cu 2+ reversed this signal, consistent with Cu 2+ -catalyzed oxidation of hydroxylamine back to 3AP 42,43 and confirming an insignificant contribution of radical adducts (e.g., methyl, acetyl, and pentanoyl) 29 to the total fluorescence signal (Figure S15).…”

Section: ■ Results and Discussionsupporting

confidence: 68%

Photoproduction Rates of One-Electron Reductants by Chromophoric Dissolved Organic Matter via Fluorescence Spectroscopy: Comparison with Superoxide and Hydrogen Peroxide Rates

Roux

Powers

Blough

2021

Environ. Sci. Technol.

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One-electron reductants (OER) photoproduced by chromophoric dissolved organic matter (CDOM) have been shown to be likely precursors for the formation of superoxide and subsequently hydrogen peroxide. An improved method that employs a nitroxide radical probe (3AP) has been developed and utilized to determine the photoproduction rates of OER from a diverse set of CDOM samples. 3AP reacts with OER to produce the hydroxylamine, which is then derivatized with fluorescamine and quantified spectrofluorometrically. Although less sensitive than traditional methods for measuring R O2•− , measuring R H provides a simpler and faster method of estimating R O2•− and is amenable to continuous measurement via flow injection analysis. Production rates of OER (R H ), superoxide (R O2•− ), and hydrogen peroxide (R H2O2 ) have a similar wavelength dependence, indicating a common origin. If all the OER react with molecular oxygen to produce superoxide, then the simplest mechanism predicts that R H /R H2O2 and R O2•− /R H2O2 should be equal to 2. However, our measurements reveal R H /R H2O2 values as high as 16 (5.7−16), consistent with prior results, and R O2•− /R H2O2 values as high as 8 (5.4−8.2). These results indicate that a substantial fraction of superoxide (65−88%) is not undergoing dismutation. A reasonable oxidative sink for superoxide is reaction with photoproduced phenoxy radicals within CDOM.

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Section: ■ Results and Discussionsupporting

confidence: 68%

Photoproduction Rates of One-Electron Reductants by Chromophoric Dissolved Organic Matter via Fluorescence Spectroscopy: Comparison with Superoxide and Hydrogen Peroxide Rates

Roux

Powers

Blough

2021

Environ. Sci. Technol.

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“…Such a low concentration of Fe(II) could efficiently alleviate the accumulation of ferric oxide sludge in conventional Fe(II)/PMS process. Although hydroxylamine is a toxic compound, it can be decomposed completely by catalysts such as transition metals with enough dosage of oxygen or air at ambient temperature with environmentally benign by-products (nitrogen and water) (Gomez et al, 1990;Song et al, 2008). Considering the efficient generation of powerful oxidants like HO• and the more selective oxidant like SO4 •-, the HA/Fe(II)/PMS process might be a promising process to remove SMX even other antibiotics and refractory organic contaminants from wastewater.…”

Section: Engineering Implicationsmentioning

confidence: 99%

Efficient degradation of sulfamethoxazole by the Fe(II)/HSO5− process enhanced by hydroxylamine: Efficiency and mechanism

Liu

Han

et al. 2017

Journal of Hazardous Materials

156

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Fenton or Fenton-like processes have been regarded as feasible methods to degrade a wide variety of contaminants by generating reactive species, but the efficiency is highly affected by the slow transformation from Fe(III) to Fe(II) as well as pH. This study proposed a method by adding hydroxylamine (HA) to the Fe(II)/HSO5 -(Fe(II)/PMS) process to accelerate the degradation of contaminants, selecting a broad-spectrum sulfonamide antibiotic -

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“…Thus, the catalytic effect of Cu is favored using a borate buffer 11 and the use of a phosphate buffer with EDTA enhanced the catalytic effect of Fe and inhibited the Cu catalytic effect. 12 This differentiation has been previously used to determine one of these metals in the presence of the other, such as the methods presented by Gomez et al 12 and Cladera et al 13 which used thermometric and spectrophotometric detection for Cu and Fe determination, respectively. In the spectrophotometric variant, 13 the nitrite formed during the catalytic hydroxylamine oxidation was monitored by azo dye formation using the Griess reagent, sulphanilamide and N-(1-naphthyl)ethylenediamine.…”

Section: Introductionmentioning

confidence: 99%

Kinetic-catalytic method for sequential determination of iron and copper using a chip coupled to a multipumping flow system

et al. 2015

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Thermometric determination of CuIIbased on its catalytic effect on the oxidation of hydroxylamine by dissolved oxygen

Cited by 9 publications

References 6 publications

Photoproduction Rates of One-Electron Reductants by Chromophoric Dissolved Organic Matter via Fluorescence Spectroscopy: Comparison with Superoxide and Hydrogen Peroxide Rates

Photoproduction Rates of One-Electron Reductants by Chromophoric Dissolved Organic Matter via Fluorescence Spectroscopy: Comparison with Superoxide and Hydrogen Peroxide Rates

Efficient degradation of sulfamethoxazole by the Fe(II)/HSO5− process enhanced by hydroxylamine: Efficiency and mechanism

Kinetic-catalytic method for sequential determination of iron and copper using a chip coupled to a multipumping flow system

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