scholarly journals Mathematical Model of the Catalytic Effect of Chromium(VI) on Hypochlorite Disproportionation in Chlorate Electrolysis

2018 ◽  
Vol 165 (2) ◽  
pp. E8-E19 ◽  
Author(s):  
M. Spasojević ◽  
D. Marković ◽  
T. Trišović ◽  
Milica Spasojević
Keyword(s):  
Mathematical Model ◽  
Catalytic Effect ◽  
Chromium Vi ◽  
Chlorate Electrolysis

Chemiluminescence determination of chromium(VI), molybdenum(VI), and vanadium(V) with bis-(2,4,6-trichlorophenyl) oxalate and perylene

1982 ◽  
Vol 47 (6) ◽  
pp. 1606-1612 ◽  
Author(s):  
Záviš Holzbecher ◽  
Lubomír Kábrt ◽  
Lubomír Janšta
Keyword(s):  
Hydrogen Peroxide ◽  
Standard Deviation ◽  
Oxygen Transfer ◽  
Methyl Acetate ◽  
Catalytic Effect ◽  
Metal Salts ◽  
Experimental Conditions ◽  
Chromium Vi ◽  
Relative Standard

The effect of the experimental conditions (pH, ionic strength, hydrogen peroxide concentration) and of various metal salts on the chemiluminescence occurring during oxidation of bis-(2,4,6-trichlorophenyl) oxalate (TCPO) with hydrogen peroxide in the presence of perylene was studied in water-methyl acetate solutions. The spectrum of the emitted radiation was found practically identical with the fluorescence spectrum of perylene. The observed catalytic effect of Cr(IV), Mo(VI), and V(V) on the chemiluminescence reaction in question can be explained so that these elements form peroxo acids with hydrogen peroxide, thereby facilitating the oxygen transfer from the latter to TCPO. Based on this phenomenon, a method is suggested for the determination of the above elements in concentrations about 10-3 to 10-4 mol l-1; its precision, represented by the relative standard deviation, is about 3-4%, the limits of determination of Cr(VI), Mo(VI), and V(V) are approximately 5-10 μg.

scholarly journals A review of chromium(VI) use in chlorate electrolysis: Functions, challenges and suggested alternatives

2017 ◽  
Vol 234 ◽  
pp. 108-122 ◽  
Author(s):  
Balázs Endrődi ◽  
Nina Simic ◽  
Mats Wildlock ◽  
Ann Cornell
Keyword(s):  
Chromium Vi ◽  
Chlorate Electrolysis

scholarly journals Kinetics and Mechanism of Paracetamol Oxidation by Chromium(VI) in Absence and Presence of Manganese(II) and Sodiumdodecyl Sulphate

2007 ◽  
Vol 2007 ◽  
pp. 1-5 ◽  
Author(s):  
Mohammed Ilyas ◽  
Maqsood Ahmad Malik ◽  
Syed Misbah Zahoor Andrabi ◽  
Zaheer Khan
Keyword(s):  
Catalytic Effect ◽  
Complexing Agents ◽  
First Order ◽  
Chromium Vi ◽  
Optimum Reaction ◽  
Fast Kinetic ◽  
Kinetic Spectrophotometric ◽  
Anionic Micelles ◽  
Kinetics Of

The kinetics of paracetamol oxidation are first order each in [paracetamol] and [HClO4]. The kinetic study shows that the oxidation proceeds in two steps. The effects of anionic micelles of sodiumdodecyl sulphate (SDS) and complexing agents (ethylenediammine tetraacetic acid (EDTA) and 2,2′-bipyridyl (bpy)) were also studied. Fast kinetic spectrophotometric method has been described for the determination of paracetamol. The method is based on the catalytic effect of manganese(II) on the oxidation of paracetamol by chromium(VI) in the presence of HClO4 (= 0.23 mol dm−3). Optimum reaction time is 4 to 6 minutes at a temperature of 30∘C. The addition of manganese(II) ions largely decreased the absorbance of chromium(VI) at 350 nm. This reaction can be utilized for the determination of paracetamol in drugs.

Mathematical model of hit phenomena and its application to movie advertisement

2008 ◽  
Author(s):  
Ishii Akira ◽  
Yoshida Narihiko ◽  
Hayashi Takafumi ◽  
Umemura Sanae ◽  
Nakagawa Takeshi
Keyword(s):  
Mathematical Model
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