
%0 Journal Article
%A Downes, AM 
%T The reaiation chemistry of aqueous solutions of [<sup>14</sup>C]Benzoic and [<sup>14</sup>C}Salicylic Acids
%J Australian Journal of Chemistry
%D 1958/06/01
%V 11
%N 2
%P 154-167
%K 
%R https://doi.org/10.1071/CH9580154
%U https://www.publish.csiro.au/paper/CH9580154 
%X Radioactive tracer techniques have been used to study the effect of ionizing radiation (60Co &#947;-radiation and 45 kV X-rays) on [14C]benzoic acid (both carboxyl- and uniformly-labelled) and on [carboxy-14C]salicylic acid in aerated aqueous solutions.      The production of o-, m-, and p-hydroxybenzoic acids from benzoic acid (Loebl, Stein, and Weiss 1951) has been cord3rmed. The approximate initial G values for these products were : ortho, 0.74 ; meta, 0.42 ; para, 0.33. The ratio o : m : p was thus approximately 9 : 5 : 4 whereas Loebl, Stein, and Weiss found the corresponding ratio to be 5 : 2 : 10. Benzoic acid and sodium benzoate were also decarboxylated [G(CO2) : 0.73 ± 0.03]. The extent of decarboxylation was independent of the initial concentration of benzoic acid in the range studied (0.5-7.0 X 10-3 M). The total reaction of the benzoic acid corresponded to a G value of approximately 2.6. Very little, if any, diphenyl was produced.   The main non-volatile products from salicylic acid were 2,3- and 2,5-dihydroxy- benzoic acids which were obtained in the ratio 2,5 : 2,3 :: 1 : 1.6. The 2,4- and 2,6- isomers were not detected. Salicylic acid was also decarboxylated, G(CO2) being 1 53 ± 0.07 in alkaline solutions.   The above results are compared with other results relating to free-radical reactions. The possible use of the decarboxylation of sodium [carboxy-14C]benzoate as a sensitive dosimeter for ionizing radiation is suggested. 
