REDUCTION AND AGGREGATION OF SILVER IONS AND MIXED AGGREGATES IN AQUEOUS-SOLUTIONS OF CARBOXYMETHYL CELLULOSE

Radiolytic reduction of silver ions and its aggregates were studied in aqueous carboxy methyl cellulose (CMC) solutions. The early processes of silver gets affected in the presence of CMC via complexation. The ratio of silver ions to CMC chains decreases Or accelerates' the proce sses that involve silver ions. Presence of excess silver ions enhances the stability of small clusters in the presence of CMC. Mixed aggrega tes of thallium/silver and cadmium/silver get stabilised in the presen ce of CMC. It is concluded that Co+ do not transfer electron to Pb2+ a nd Tl+. Also, no electron transfer reaction was observed between eithe r Tl-2(+) and Co2+ or Pb-o and Cd2+. However, Zn+ transfers electron t o Pb2+ and Tl-2(+) transfers electron to Cu2+ With a rate of 4.2x10(7) M(-1) s(-1) and 3.5x10(9) M-l s(-1), respectively. The reactions are discussed in terms of the electrochemical potential of the metal ions (or metals) involved. Copyright (C) 1997 Elsevier Science Ltd