Dichromate titration of thallium(I).
The formal redox potentials of the thallium(III)-thallium(I) couple in different acids of varying strengths are reported. The minimum concentration of hydrochloric acid required for a direct titration of thallium(I) with potassium dichromate is 5M. Thallium(I) can be titrated directly with the primary standard oxidant, potassium dichromate, at room temperature, with ferroin as indicator, in 6M hydrochloric acid. Atmospheric oxygen must be excluded.
Sagi
S R
SR
Department of Chemistry Andhra University Waltair, India.
Raju
G S
GS
Ramana
K V
KV