تحديد السيلينيوم الرياعي (IV)‎Se في الأوية باستخدام المساري المعدلة كهركيميائيا بدقائق أكسيد الكوبالت النانوية

الملخص EN

The electrochemical behavior of the selenite anion SeO3 2- on the glassy carbon electrode (GCE) electrochemically modified with Cobalt oxides nanoparticles has been studied.

It was shown that the anodic signal related to the oxidation of Se(IV) in selenite anion SeO3 2- to Se(VI) in selenate anion SeO4 2- , which appears at the potential (Ep =1.01 V) is proportional to Se(IV) concentration in wide range (10-7 - 10-4M).

The electrochemical process which is responsible for the anodic signal is two sequence steps: the first has a catalytic nature, and dominates on low selenium concentrations[CSeO3 2-≤ 10-6 M].

And the second: has a diffusion nature, and dominates on high selenium concentrations [CSeO3 2- ≥ 10-5 M].

Some effects of parameters influence in the anodic signal such as: end voltametric curve potential, speed of rotating electrode, supporting electrolyte concentration have been studied.

A linear relationship for determination of selenium (IV) for micro-concentrations has been obtained.

A new fast, sensitive, and cheap analytical method was fabricated to determine traces of Se(IV) in some medicines and other samples.

Good statistical criteria were obtained, RSD% ≤ 3.1%.