ISSN:
0021-8383
Keywords:
Chemistry
;
Organic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The polarographic behaviour of thio-lactic acid (RSH) at d.m.e. has been investigated in the presence of KNO3 and in different water-ethanol (0 - 50% by volume) mixtures at 30.0 ± 0.2°C. A solution of 0.001% Triton X-100 was used as maximum suppressor. The effect of pH, concentration, temperature, drop time and solvent composition on the characteristics and mechanism of the electrode reaction have been studied in detail. The wave was diffusion controlled, reversible one electron and proportional to RSH concentration in different ethanolic media. The anodic wave of RSH at d.m.e. does not correspond to the formation of RSSR, but to a mercury compound RSHg. The diffusion current (id) decreases with increasing concentration of ethanol and is proportional to the square root of viscosity of the medium. The value of E1/2 shifts towards more negative potentials and the values of the dissociation constant decrease with increasing ethanol concentration. The linearity of id with RSH concentration provides a rapid and precise method for the determination of RSH down to 0.03 mM.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/prac.19733150504
