Pulse radiolysis of an aqueous solution of mono-valent thallium ion and mixed solutions of Tl+/Ag+ in the presence of various amino polycarboxylic acids such as trans-1,2-diaminocyclohexane-N,N,N′,N′-tetraacetic acid (DCTA), diethylenetriaminepentaacetic acid (DTPA), N-(2-hydroxyethyl)ethylenediaminetriacetic acid (HEDTA) and triethylenetetraminehexaacetic acid (TTHA) has been carried out. Abnormal valence states of Tl ions were generated. It is concluded that DCTA, DTPA, HEDTA and TTHA decrease the redox potential of Tl ions in aqueous solutions. It was observed that the electron transfer from complexed Tl 2 + to Ag+ varied in the range 7.5 × 108 to 1.0 × 109, depending on the type of complexing ligand. Electron transfer from Tl 2 + to Ag+ lead to the formation of silver atoms, which agglomerate further to form silver colloid.
Research on Chemical Intermediates – Springer Journals
Published: Jan 20, 2009
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