Hydrogen peroxide vapour pressure

Vapour phase hydrogen peroxide explosions. Hydrogen peroxide vapour of concentration above 39% m/m at atmospheric pressure is explosive (Figure 1.26).48... 

Moore [355] used the solvent extraction procedure of Danielson et al. [119] to determine iron in frozen seawater. To a 200 ml aliquot of sample was added lml of a solution containing sodium diethyldithiocarbamate (1% w/v) and ammonium pyrrolidine dithiocarbamate (1 % w/v) at pH to 4. The solution was extracted three times with 5 ml volumes of 1,1,2 trichloro-1,2,2 trifluoroethane, and the organic phase evaporated to dryness in a silica vial and treated with 0.1 ml Ultrex hydrogen peroxide (30%) to initiate the decomposition of organic matter present. After an hour or more, 0.5 ml 0.1 M hydrochloric acid was added and the solution irradiated with a 1000 W Hanovia medium pressure mercury vapour discharge tube at a distance of 4 cm for 18 minutes. The iron in the concentrate was then compared with standards in 0.1 M hydrochloric acid using a Perkin-Elmer Model 403 Spectrophotometer fitted with a Perkin-Elmer graphite furnace (HGA 2200). 

A student collected 375 mL of oxygen gas from the decomposition of hydrogen peroxide. The gas was collected over water at 19X1 and 100.2 kPa. What mass of oxygen was collected The vapour pressure of water at 19 is 2.2 kPa. 

The vapour pressure and partial pressure of aqueous hydrogen peroxide are illustrated as a function of temperature in Figures 1.22 and 1.23 respectively. 

Figure 1.22 Vapour pressure of hydrogen peroxide-water mixtures.

It reacts with hydrogen peroxide, forming methyl peroxide, CHg—O—O—CH3, a gas at ordinary temperatures with an odour reminiscent of nitrous gases. It boils at 13-5° C. at a pressure of 740 mm. Heated in admixture with air it explodes with violence and flame, evolving formaldehyde. The vapour of methyl peroxide irritates the respiratory passages. ... 

These results should also help to find an appropriate test method for the degradability of the chemicals in the environment. Chemicals which do not fulfill the structural requirements for the degradation in the gaseous phase can be degraded hy the help of different oxygen species in the troposphere. The substances with low vapour pressure and high solubility in the aqueous phase in the presence of hydrogen peroxide and on the adsorbed phase should be experimented upon. It is also necessary to find if there is a correlation between the structure and reactivity of a substance and if a relation can be made between the physico-chemical properties and the rate constant of a chemical (Table 7). 

Hydrogen peroxide [7722-84-1] M 34.0, d 1.110, pK 11.65. The 30% material has been steam distilled using distilled water. Gross and Taylor [/ Am Chem Soc 72 2075 7950] made 90% H2O2 approximately O.OOIM in NaOH and then distilled under its own vapour pressure, keeping the temperature below 40°, the receiver being cooled with a Dry-ice/isopropyl alcohol mush. The 98% material has been rendered anhydrous by repeated fractional crystn in all-quartz vessels. EXPLOSIVE IN CONTACT WITH ORGANIC MATERIAL. 

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