Search Results

You are looking at 1 - 10 of 13 items for

  • Author or Editor: R. Čech x
  • Refine by Access: All Content x
Clear All Modify Search

The 9th Radiochemical Conference

Piešt'any, Czechoslovakia, 12–15 September 1978

Journal of Radioanalytical and Nuclear Chemistry
Author: R. Čech
Restricted access
Restricted access

Abstract  

We have investigated the influence of the presence of nitric acid on the stability of benzyldibutylamine in the organic phase irradiated by a dose of 143 kGy. The composition of degradation products of radiolysis in individual chromatographic fractions was identified by means of mass, NMR and IR spectra and elemental analysis. It follows from the mass blance that benzyldibutylamine is stable with gamma-radiation of medium-high dose and that its mass loss does not exceed 22% of the irradiated fraction.

Restricted access
Restricted access

Abstract  

The radiolysis of the CHCl3-water two-phase system in the absence of oxygen has been investigated by continuous -ray irradiation. The major products of radiolysis were determined to be the same, except for tetrachloromethane, as in the case of the radiolysis of pure CHCl3, however, the radiolytical yields were different. The dependencies of gross radiation yields of the radiolysis products on the CHCl3 volume fraction follow the two-phase rule of additivity. The partial yields of all products determined were calculated for both phases and revealed that the major products HCl and C2H2Cl4 are formed in both phases. The other organic products are formed mainly in the organic phase. The decrease of organic product yields is probably caused by the presence of water in the organic phase. The radiolysis of CHCl3-water did not proceed in the diffusional regime even at high absorbed doses due to the relatively high solubility of CHCl3 in water andvice versa.

Restricted access

Abstract  

Two-phase additivity rule for radiation yields of p-nitrophenol, m-nitrophenol and p-nitrosophenol has been demonstrated. The data of partial radiation yields indicated that the nitrobenzene phase is by several times more reactive than a water phase /H2O, 3M HNO3 or 1.5M H2SO4/ in respect of nitrophenols formation.

Restricted access

Abstract  

With the aim of studying the effects of volume ratios and composition of the organic phase on the total yields of the main degradation products of tributyl phosphate (TBP) radiolysis, the following two-phase systems were used: water-TBP-carbon tetrachloride and water-TBP-n-alkane with various ratio of TBP in the organic phase and various volume ratios of organic-aqueous phases. We examined the influence of the distribution of two-phase systems components-precursors of radiolytic products on the total yields of the main radiolytic products and mechanism involved.

Restricted access

Abstract  

The main ionogenic radiolytical degradation products are monobutylphosphate, phosphoric acid, formic, acetic, propionic and butyric acids as the result of gamma-irradiation of two-phase water-dibutylphosphate system. The products were determined using capillary isotachophoresis. According two-phase theory the total (T G(X)) and partial (GI(X) for aqueous phase and GII(X) for organic phase) radiation yields of products and decomposition of DBP in the radiolysis of two phase water-dibutylphosphate systems were calculated from the results.

Restricted access

Abstract  

A capillary isotachophoresis was used for determination of ionogenic radiolytic products of two-phase tributylphosphate—water systems. Optimum operating conditions for analytical determination of dibutylphosphate (DPP), monobutylphosphate (MBP), H3PO4, formic, acetic, propionic and butyric acid were found.

Restricted access

Abstract  

It was found that the main ionogenic radiolytical degradation products of tributylphosphate were monobutylphosphate dibutylphosphate, phosphoric acid, formic, acetic, propionic and butyric acids as the result of gamma-irradiation of two-phase water-tributylphosphate system. In the case of irradiation of two-phase water-di(2-ethylhexyl)-phosphoric acid system, the main radiolytic degradation products are 2-ethylhexylphosphoric acid and phosphoric acid. All products were determined using isotachophoresis. According two-phase theory the total and partial radiation yields of products were calculated from the results.

Restricted access