Ultraviolet molar absorptivities of aqueous hydrogen peroxide and hydroperoxyl ion

Morgan, Marlo S.; Trieste, Paul F. Van; Garlick, Stephanie M.; Mahon, Martin J.; Smith, Allan L.

doi:10.1016/s0003-2670(00)85294-0

Cited by 81 publications

(61 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Catalase suspension (Sigma C1000) was diluted with MQ to 1400 kU L 21 and stored at 4uC. 1 mmol L 21 H 2 O 2 solution was prepared by dilution of 30% weight/weight (w/w) H 2 O 2 (Sigma H1009), standardized by ultraviolet spectrophotometry (Morgan et al 1988) and stored at 4uC. A 10% volume/volume (v/v) solution of acetone (Sigma 179124) in MQ was stored at room temperature.…”

Section: Methodsmentioning

confidence: 99%

Dynamics of nonphotochemical superoxide production in the Great Barrier Reef lagoon

Rose

Godrant

Furnas

et al. 2010

Limnology & Oceanography

View full text Add to dashboard Cite

Superoxide (O 2 2 ) and hydrogen peroxide (H 2 O 2 ) concentrations ranging from 87 to 1120 pmol L 21 and 5 to 107 nmol L 21 , respectively, were measured in samples of surface water from the Great Barrier Reef (GBR) lagoon in the absence of photochemistry. Nonphotochemical, particle-associated net production rates of O 2 2 ranging from 1 to 16 pmol L 21 s 21 were also determined and calculated to be similar in magnitude to the likely abiotic photochemical O 2 2 production rates in GBR surface waters. Manipulative experiments using 0.22-mm filtration and addition of biological inhibitors demonstrated that the majority of this particle-associated production was biological and likely driven by photosynthetic organisms. Pseudo-first-order O

show abstract

Section: Methodsmentioning

confidence: 99%

Dynamics of nonphotochemical superoxide production in the Great Barrier Reef lagoon

Rose

Godrant

Furnas

et al. 2010

Limnology & Oceanography

View full text Add to dashboard Cite

show abstract

“…EDTA and DTPA were added from stock solutions adjusted to pH ≈ 7.2 while citrate was added to solutions as solid disodium hydrogen citrate sesquihydrate (C 6 H 6 Na 2 O 7 ·1.5H 2 O). H 2 O 2 stock solutions were prepared by dilution of a 30.7% w/v H 2 O 2 solution (Riedel-de Haën, stabilized with 40 mg/L dipicolinic acid) and standardized spectrophotometrically using ε 250 = 22.7 M −1 ·cm −1 (Morgan et al, 1988). Fe(II) stock solutions were prepared daily from Fe(II)SO 4 ·7H 2 O (4 mM) and adjusted to pH 4 with HCl.…”

Section: Chemicalsmentioning

confidence: 99%

Importance of Iron Complexation for Fenton-Mediated Hydroxyl Radical Production at Circumneutral pH

2016

View full text Add to dashboard Cite

The reaction between Fe(II) and H 2 O 2 to yield hydroxyl radicals (HO • ), the Fenton reaction, is of interest due to its role in trace metal and natural organic matter biogeochemistry, its utility in water treatment and its role in oxidative cell degradation and associated human disease. There is significant dispute over whether HO • , the most reactive of the so-called reactive oxygen species (ROS), is formed in this reaction, particularly under circumneutral conditions relevant to natural systems. In this work we have studied the oxidation kinetics of Fe(II) complexed by L = citrate, ethylenediaminetetraacetic acid (EDTA) and diethylenetriaminepentaacetic acid (DTPA) and also measured HO • production using phthalhydrazide as a probe compound at pH 8.2. A kinetic model has been developed and utilized to confirm that HO • is the sole product of the Fe(II)L-H 2 O 2 reaction for L = EDTA and DTPA. Quantitative HO • production also appears likely for L = citrate, although uncertainties with the speciation of Fe(II)-citrate complexes as well as difficulties in modeling the oxidation kinetics of these complexes has prevented a definitive conclusion. In the absence of ligands at circumneutral pH, inorganic Fe(II) reacts with H 2 O 2 to yield a species other than HO • , contrary to the well-established production of HO • from inorganic Fe(II) at low pH. Our results suggest that at high pH Fe(II) must be complexed for HO • production to occur.

show abstract

“…Ten millimolar H 2 O 2 stock solutions were prepared weekly by dilution from a 30.7% w/v H 2 O 2 solution (Riedel-de Haën) and standardized by UV spectrophotometry at 250 nM (e 250 = 22.7 L mol À1 cm À1 Morgan et al, 1988) every few days. The H 2 O 2 used for solution preparation was stabilized with 40 mg L À1 dipicolinic acid, with residual stabilizer in experimental runs always 62.5 pM.…”

Section: Reagent Preparationmentioning

confidence: 99%

Impact of natural organic matter on H2O2-mediated oxidation of Fe(II) in a simulated freshwater system

Miller

Rose

Waite

2009

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

Ultraviolet molar absorptivities of aqueous hydrogen peroxide and hydroperoxyl ion

Cited by 81 publications

References 10 publications

Dynamics of nonphotochemical superoxide production in the Great Barrier Reef lagoon

Dynamics of nonphotochemical superoxide production in the Great Barrier Reef lagoon

Importance of Iron Complexation for Fenton-Mediated Hydroxyl Radical Production at Circumneutral pH

Impact of natural organic matter on H2O2-mediated oxidation of Fe(II) in a simulated freshwater system

Contact Info

Product

Resources

About