Jj. Berzas et al., VOLTAMMETRIC BEHAVIOR OF PYRIMETHAMINE IN VETERINARY FORMULATIONS USING SQUARE-WAVE AND ADSORPTIVE SQUARE-WAVE TECHNIQUES, Electroanalysis, 7(12), 1995, pp. 1156-1160
The voltammetric behavior of pyrimethamine (PMT) was studied by square
-wave (SW) and square-wave stripping (SWS) techniques, leading to two
methods for its determination [in presence of sulfaquinoxaline (SQX)]
in aqueous samples and veterinary formulations. Due to overlapping res
ponse of SQX and PMT the first derivative was used for the simultaneou
s determination of these two components. The relative standard deviati
ons obtained for concentration levels of PMT as low as 3 x 10(-6) M (S
W) and 5 x 10(-7) M (SWS) were 2.2% and 2.7% (n = 10), respectively.