تقدير الفناديوم من خلال تكوينه المعقد التناسقي مع حامض الثايوكلايكول

Abstract

A new complex of vanadium with thioglycolic acid (VO–SH) was prepared in (3:2) ratio at pH (5-5.5). The optimum conditions and stability have been investigated using spectrophotometric technique.The (VO–SH) formation reaction is sensitive and selective for determination of vanadium over the concentration range (0.05 – 12) µg.ml-1 with a high linearity (99.78%), correlation coefficient (r) = 0.9989. The proposed method has proved to be accurate (recovery % = 99.6), precision (RSD = 0.31%) and highly sensitive (detection limit = 10 ng.ml-1).Explanation of different interferences effect via thermodynamic functions (E1/2, ΔG, Kequil.) for reaction used and it was possible to explain much of the obtained results.