Action of γ-Rays on Aqueous Solutions of Nitrous Oxide and the Effects of Added Solutes

1964 ◽  
Vol 68 (7) ◽  
pp. 1731-1737 ◽  
Author(s):  
G. Scholes ◽  
M. Simic
Keyword(s):  
Nitrous Oxide ◽  
Aqueous Solutions ◽  
Γ Rays

On the Radiolysis of Alkali Halides in Aqueous Solutions Saturated with Nitrous Oxide

1964 ◽  
Vol 68 (10) ◽  
pp. 2967-2970 ◽  
Author(s):  
M. Anbar ◽  
D. Meyerstein ◽  
P. Neta
Keyword(s):  
Nitrous Oxide ◽  
Aqueous Solutions ◽  
Alkali Halides

γ-Radiolysis of disulfides in aqueous solution. III. L-Cysteine-D-penicillamine mixed disulfide

1969 ◽  
Vol 47 (6) ◽  
pp. 1037-1043 ◽  
Author(s):  
J. W. Purdie
Keyword(s):  
Aqueous Solution ◽  
Free Radicals ◽  
Aqueous Solutions ◽  
Dose Rate ◽  
Sulfonic Acids ◽  
Rate Dependent ◽  
Mixed Disulfide ◽  
Γ Rays ◽  
Symmetrical Disulfides ◽  
Symmetrical Disulfide

L-Cysteine-D-penicillamine mixed disulfide (CySSPen) was irradiated in aerated and deaerated aqueous solutions with 60Co γ-rays. G values were determined for all products identified after exposure to 10 000 rads. The major products were the sulfinic and sulfonic acids (CySO2H, CySO3H, and PenSO2H), the sulfhydryl derivatives (CySH and PenSH), symmetrical disulfides (CySSCy and PenSSPen), three trisulfides (CySSSCy, CySSSPen, and PenSSSPen), and ammonia. Each half of the disulfide behaved in exactly the same way as the corresponding symmetrical disulfide. Products from the CyS— part of the disulfide were dose rate dependent while products from the PenS— part were independent of dose rate. The reactions proposed for the symmetrical disulfides were adequate to explain radiolysis of the unsymmetrical disulfide.Radiolysis of a mixture of cystine and penicillamine disulfide was examined for comparison with the unsymmetrical disulfide and was found to give very similar results. It was concluded that the free radicals produced from the water attack each half at approximately equal rates.

The photochemistry of aqueous solutions of Fe(II) II. Processes in acidified solutions of potassium ferrocyanide at 25°C

1966 ◽  
Vol 291 (1427) ◽  
pp. 478-486 ◽  
Keyword(s):  
Nitrous Oxide ◽  
Quantum Yield ◽  
Aqueous Solutions ◽  
Potassium Ferrocyanide ◽  
Geminate Recombination ◽  
Nitrate Ions ◽  
Decreasing Ph

Yields of hydrogen and nitrogen have been measured for acidified solutions of potassium ferrocyanide containing nitrous oxide illuminated with 2537 Å light. From the effect of decreasing pH and added nitrate ions which diminish ϕ (N 2 ) and the effect of isopropanol which acts as an H atom scavenger it is concluded that (i) k ( e ¯ aq. + HFe(CN) 3– 6 ) / k ( e ¯ aq . + N 2 O) = 0·25 ± 0·1 at μ = 0 and increases with increasing μ ; (ii) k (H + NO ¯ 3 ) / k (H + (CH 3 ) 4 CHOH) = 0·47 ± 0·05; (iii) k (H + Fe(CN) 3– 6 ) / k (H + (CH 3 ) 2 CHOH) = 72 ± 7 and is independent of μ ; (iv) the protonated ferrocyanide ion, HFe(CN) 3– 6 absorbs 2537 Å light and undergoes decomposition according to either ( a ) HFe(CN) 3– 6 + hv → H + + Fe(CN) 3– 6 + e ¯ aq. or (b) HFe(CN) 3– 6 + hv → H + Fe(CN) 3– 6 which is opposed by geminate recombination and such that ϕ a + ϕ b < 0·66, the quantum yield of Fe(CN) 4– 6 + hv → Fe(CN) 3– 6 + e ¯ aq. . The implications of these results are discussed.

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