Polarography of thiomalic acid at the dme

✍ Scribed by R.S. Saxena; K.C. Gupta

• Publisher: Elsevier Science
• Year: 1968
• Tongue: English
• Weight: 540 KB
• Volume: 13
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(68)80082-9

✦ Synopsis

The polarograpbic behaviour of thiomalic acid (TSH) at the dme has been investigated in presence of O-1 M KC1 and 0.01% thymol, with respect to the effect of changes in pH, concentration of TSH, drop time and temperature on the wave characteristics and on the mechanism of the reaction occurring at the surface of the mercury drop. Variations in H+ ion concentration of the medium between 4.0 and 7.0 had a negligible effect on the well defined reversible anodic wave of TSH; at lower (< 40) and higher (> 7.0) pH values, ill-defined waves were obtained. The proportionality of wave height with TSH concentrations, d/hen and temperature, and a linear plot of E 11s log (id -i)/i with slope of @061, indicate that the reaction of TSH at the dme is strictly diffusion-controlled and reversible, involving a one-electron transfer process. The current voltage curves over the entire pH range (1+10.68) obey the equation TSH+Hg+TSHg+H++e.