Complex formation between iron(II) and inorganic anions. Part II. The effect of oxyanions on the reaction of iron(II) with hydrogen peroxide

1968 ◽  
pp. 308 ◽  
Author(s):  
C. F. Wells ◽  
M. A. Salam
Keyword(s):  
Hydrogen Peroxide ◽  
Complex Formation ◽  
Inorganic Anions

Degradation of the Pesticide Chlorpyrifos in Aqueous Solutions with UV/H2O2: Optimization and Effect of Interfering Anions

2014 ◽  
Vol 17 (1) ◽  
Author(s):  
André Gadelha de Oliveira ◽  
Jefferson Pereira Ribeiro ◽  
Juliene Tome de Oliveira ◽  
Denis De Keukeleire ◽  
Maíra Saldanha Duarte ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Aqueous Solutions ◽  
Uv Radiation ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Inorganic Anions ◽  
Pesticide Concentration ◽  
Effects Of Temperature

AbstractThis study investigates the use of an advanced oxidation process (AOP) for removal of the pesticide chlorpyrifos in a recirculated system, especially considering the effects of temperature, hydrogen peroxide dosage, pH, pesticide concentration and added inorganic anions. The results indicate that a temperature of 45 °C gave the best performance using only UV-radiation, while for the UV/H

Analysis of a complex produced in the Fenton oxidation process

2014 ◽  
Vol 69 (5) ◽  
pp. 1115-1119 ◽  
Author(s):  
Chang Wang ◽  
Siyue Zhang ◽  
Sakai Yuji ◽  
Zongpeng Zhang
Keyword(s):  
Hydrogen Peroxide ◽  
Complex Formation ◽  
Hydroxyl Radical ◽  
Fenton Reaction ◽  
Oxidation Process ◽  
Fenton Oxidation ◽  
Radical Theory ◽  
Uv Visible ◽  
Iron Based ◽  
Fenton Oxidation Process

The absorbances of different concentrations of Fe2+, Fe3+ and H2O2 were investigated by UV-visible spectrophotometry without separating the substances. The law of complex formation was studied by considering changes in the UV-vis spectra of mixtures of these three substances. The results show that upon eliminating the influence of the substrate, an iron-based complex was present in the Fenton reaction, which exhibited substantial absorbance from 190 to 500 nm. Therefore, the presence of an unknown complex in the Fenton oxidation process was verified and its concentration varied with a change in the concentration of hydrogen peroxide. This study provides a strong foundation for further studies into the mechanism of traditional hydroxyl radical theory of the Fenton reaction.

Complexing of Reduced Technetium and Tin(II) by Chelating Phosphate Compounds

1979 ◽  
Vol 18 (02) ◽  
pp. 105-109
Author(s):  
M. Hohloch ◽  
G. Hoffmann ◽  
C. Schümichen
Keyword(s):  
Hydrogen Peroxide ◽  
Soft Tissue ◽  
Complex Formation ◽  
Urinary Excretion ◽  
Tissue Concentration ◽  
Distribution Patterns ◽  
In Vitro Stability ◽  
Colloid Formation ◽  
Phosphate Compounds

The in vitro stability of 99mTc- and 113Sn-pyrophosphate and -ethane-1, hydroxy-1, diphosphonate (EHDP) complexes was studied by varying the mode of preparation. The 1-hr distribution in the rat was used as an indicator for complex formation or destruction. A maximum of bone uptake and urinary excretion and a minimum of soft tissue concentration was obtained if there was an excess of phosphate in relation to tin(II) in the equilibrium. Formation of tin(II) colloid was favoured in the presence of an excess of tin(II) in the equilibrium, 99mTc colloid occurred with some delay. After dilution in neutral normal saline the chelates were more or less destroyed, as shown by a 113Sn(II) colloid formation whereas the 99mTc-phosphate complexes were transformed into a 99mTc kidney agent. At pH 11 the 113Sn(II)-phosphate complexes proved to be stable, the 99mTc-phosphate complexes were also transformed into the 99mTc kidney agent. Oxidation of all tin(II) in the equilibrium by hydrogen peroxide did not change the distribution patterns of 113Sn, 99mTc was oxidized to pertechnetate. In general complexes between tin(II) and chelating phosphate compounds proved to be more stable than those with reduced technetium. EHDP was found to form stronger complexes with tin(II) and reduced technetium than pyrophosphate.

The kinetics of complex formation between Ti(IV) and hydrogen peroxide

2007 ◽  
Vol 39 (8) ◽  
pp. 457-461 ◽  
Author(s):  
Daniel W. O'Sullivan ◽  
Michael Tyree
Keyword(s):  
Hydrogen Peroxide ◽  
Complex Formation ◽  
Kinetics Of
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