A sensitive method for electrochemical determination of molybdenum (VI) in plant foodstuff samples using Ni0.5Zn0.5Fe2O4 nanocomposite modified carbon paste electrode

Nanochemistry Research

卷:1

Tayyebeh Madrakian¹  Atousa Bahiraei¹  Abbas Afkhami¹  Mahdi Moradi¹ 

[1] Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran;

关键词: carbon paste modified electrode;    determination of mo (vi) ion;    electrochemical method;    food samples;    magnetic nickel zinc ferrite;    nanocomposite;   

DOI  :  10.7508/ncr.2016.02.012

来源: DOAJ

【 摘 要 】

In the present study, a new chemically modified carbon paste electrode (CPE) is constructed for rapid, accurate, simple, highly sensitive, and selective determination of Mo (VI) using differential pulse voltammetry. The electrode was prepared using magnetic nickel zinc ferrite nanocomposite (Ni0.5Zn0.5Fe2O4), as the modifier in CPE (Ni0.5Zn0.5Fe2O4/CPE). Mo (VI) was determined after preconcentration at the surface of the modified electrode at -0.7 V vs. Ag/AgCl. Under the optimal conditions, the linear dynamic range and limit of detection were 0.005-1.00 and 0.003 µgmL-1, respectively. Ten successive measurements of 0.06 and 0.70 µg mL-1 of Mo (VI) ions showed the relative standard deviation of 3.20 and 1.98 %, respectively. The reproducibility and stability of the electrode response were also studied. Investigation of the effects of different cations and anions on the determination of Mo (VI) indicated that the electrode is highly selective. Furthermore, the present method was applied to the determination of Mo (VI) in several plant foodstuff samples with satisfactory results.

【 授权许可】

Unknown