CHANGES OF DENSITY OF HYDROGEN PEROXIDE SOLUTIONS ON COOLING AND FREEZING

1950 ◽  
Vol 28b (10) ◽  
pp. 599-607 ◽  
Author(s):  
Paul A. Giguère ◽  
Pierre Geoffrion
Keyword(s):  
Hydrogen Peroxide ◽  
Solid Solutions ◽  
Freezing Point ◽  
Volume Changes ◽  
Concentrated Solutions ◽  
Binary Solutions ◽  
Dilatometric Method

The densities of binary solutions of hydrogen peroxide and water from 0 °C. down to their respective freezing point were measured by the dilatometric method with an estimated precision of ± 0.0003 gm. per ml. Volume changes during solidification were also measured but with lower precision. Solutions containing less than about 50% by weight of hydrogen peroxide expand on freezing whereas more concentrated solutions contract appreciably. Various observations on the phenomenon of supercooling seem to indicate that no solid solutions are formed between the two components. Under certain conditions hydrogen peroxide solutions decompose on melting.

HYDROGEN PEROXIDE AND ITS ANALOGUES: II. PHASE EQUILIBRIUM IN THE SYSTEM HYDROGEN PEROXIDE – WATER

1951 ◽  
Vol 29 (2) ◽  
pp. 123-132 ◽  
Author(s):  
William T. Foley ◽  
Paul A. Giguère
Keyword(s):  
Hydrogen Peroxide ◽  
Phase Equilibrium ◽  
Solid Solutions ◽  
Freezing Point ◽  
Platinum Resistance Thermometer ◽  
Platinum Resistance ◽  
Radioactive Tracers ◽  
Resistance Thermometer ◽  
Pure Solution

A precision freezing point apparatus with platinum resistance thermometer was used to investigate the system hydrogen peroxide – water over the whole concentration range. The freezing point of the purest sample of hydrogen peroxide obtained by repeated fractional crystallizations of a large quantity of 99.6% pure solution was found to be −0.461°C; that of the dihydrate was −52.10°C. The two eutectics occur at concentrations of 45.2% and 61.2% H2O2 and at temperatures of −52.4° and −56.5°C. respectively. Contrary to what has been reported previously, water and hydrogen peroxide do not form solid solutions together. This was proved conclusively by applying the technique of radioactive tracers to the 'wet residue' method of Schreinemakers.

HYDROGEN PEROXIDE AND ITS ANALOGUES: V. PHASE EQUILIBRIA IN THE SYSTEM D2O–D2O2

1954 ◽  
Vol 32 (5) ◽  
pp. 550-556 ◽  
Author(s):  
Paul A. Giguère ◽  
E. A. Secco
Keyword(s):  
Hydrogen Peroxide ◽  
Melting Point ◽  
Freezing Point ◽  
Eutectic Point ◽  
Cooling Curves ◽  
Addition Compound ◽  
Concentrated Solutions ◽  
Number Of Solutions ◽  
Point Curve ◽  
Solid Liquid

The cooling curves of a number of solutions of deuterium peroxide in heavy water in the concentration range 11% to 95% were measured in order to determine the solid-liquid phase diagram for that binary system. The apparatus of Herington and Handley, which uses a pulsing pressure for stirring the solutions, and a thermistor, was found to be particularly suitable for that purpose. As could be expected the freezing-point curve of the deuterated compounds is closely similar to that of the hydrogen compounds, being shifted up only by about 4° for water-rich solutions and by 2° for peroxide-rich solutions. The melting point of the addition compound, D2O.2D2O very nearly coincides with one of the eutectic points at 46.2% D2O2 and −51.5 °C.; the other eutectic point is at 60.5% D2O2 and −55.1 °C. By extrapolation the melting point of pure deuterium peroxide is found to be 1.5 °C. as compared with −0.43 °C. for hydrogen peroxide. Concentrated solutions of deuterium peroxide exhibit an extreme tendency to supercool, resulting sometimes in formation of glasses even at liquid-air temperature. The previous results of Foley and Giguère for the system H2O–H2O2 were confirmed, specially as regards the melting point of the addition compound H2O2•2H2O.

scholarly journals THE DECOMPOSITION OF HYDROGEN PEROXIDE BY LIVER CATALASE

1928 ◽  
Vol 11 (4) ◽  
pp. 309-337 ◽  
Author(s):  
John Williams
Keyword(s):  
Hydrogen Peroxide ◽  
Catalytic Decomposition ◽  
Hydrogen Ion ◽  
Ion Concentration ◽  
Concentrated Solutions ◽  
Hydrogen Ion Concentration ◽  
A Value ◽  
Optimum Ph ◽  
Adsorption Of Hydrogen ◽  
New Interpretation

1. The velocity of decomposition of hydrogen peroxide by catalase as a function of (a) concentration of catalase, (b) concentration of hydrogen peroxide, (c) hydrogen ion concentration, (d) temperature has been studied in an attempt to correlate these variables as far as possible. It is concluded that the reaction involves primarily adsorption of hydrogen peroxide at the catalase surface. 2. The decomposition of hydrogen peroxide by catalase is regarded as involving two reactions, namely, the catalytic decomposition of hydrogen peroxide, which is a maximum at the optimum pH 6.8 to 7.0, and the "induced inactivation" of catalase by the "nascent" oxygen produced by the hydrogen peroxide and still adhering to the catalase surface. This differs from the more generally accepted view, namely that the induced inactivation is due to the H2O2 itself. On the basis of the above view, a new interpretation is given to the equation of Yamasaki and the connection between the equations of Yamasaki and of Northrop is pointed out. It is shown that the velocity of induced inactivation is a minimum at the pH which is optimal for the decomposition of hydrogen peroxide. 3. The critical increment of the catalytic decomposition of hydrogen peroxide by catalase is of the order 3000 calories. The critical increment of induced inactivation is low in dilute hydrogen peroxide solutions but increases to a value of 30,000 calories in concentrated solutions of peroxide.

scholarly journals Effect of vibration and stirring on 90% and 98% hydrogen peroxide

2018 ◽  
pp. 88-96
Author(s):  
Natalia Okroj ◽  
Karolina Michalska ◽  
Bartosz Jakusz
Keyword(s):  
Hydrogen Peroxide ◽  
Concentrated Solutions ◽  
Gas Emission ◽  
Concentration Loss ◽  
High Test

The influence of vibration and stirring of 90% and 98% hydrogen peroxide (high test peroxide – HTP) of two different purity levels in accordance with MIL-PRF-16005F, was determined. Testing was conducted in order to evaluate safety of use of highly concentrated solutions of hydrogen peroxide. The influence of vibration on HTP was tested at different frequencies up to 100 Hz. Further testing investigated the influence of stirring HTP, at three different speed values: 2000 rpm, 4000 rpm and 6000 rpm. During both tests, decomposition was determined by measuring concentration loss using density assay. Liquid during the tests was visually inspected for visible signs of decomposition such as: foaming, gas emission, turbidity.

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