RADIATION-ENHANCED H-CONTAINING SOLUTION SATURATED WITH CO2( GENERATION IN IRON)

In the course of a study of radiation-induced CO2 reduction in CO2-sat urated solution with iron powder, an in situ monitoring of pH and redo x potential (ORP) was carried out in the four iron-containing solution s as follows: (1) saturated with CO2 and irradiated by gamma-rays of 2 kGy/h; (2) saturated with CO2 and unirradiated; (3) saturated with Ar and irradiated by gamma-rays; (4) saturated with Ar and unirradiated: It was revealed that gamma-rays make the pH decrease by almost 2.5, a nd that in solution (1) the rate of H+ generation is collectively enha nced 27 times as much as that due to radiolysis alone, Through analyse s of d[H+]/dt, it was suggested that corrosion of iron is forced to in crease in irradiated solutions (1) and (3), compared to the unirradiat ed solutions (2) and (4), and that only in solution (1) was the corros ion rate increased in relation to an increase in the amount of iron; i t decreased, on the contrary, in the other three solutions. Copyright (C) 1996 Elsevier Science Ltd.