Abstract

ALVARADO-GAMEZ, A.L.; LEON-ROJAS, C.  and  ESPINOZA-CASTELLON, E.R.. Development of a Voltammetric Method to Determine Molybdenum in Food Grains. Port. Electrochim. Acta [online]. 2005, vol.23, n.3, pp.393-402. ISSN 0872-1904.

It was developed a very sensitive  analytical method to determine molybdenum in water and food grains, using the linear sweep voltammetry technique, with adsorptive preconcentration of a Mo(VI) 8-hydroxyquinoline complex,  in an acetate  buffer media of pH = 3.5 and KClO₃ 0.5 mol/L as a support electrolyte.  The linear range of the methodology goes from 1.0 hg/L to 10 mg/L, with a limit of detection of 0.3 hg/L and quantification of 1.0 hg/L.  The methodology is suitable in the range of mg/L and hg/L.  The method was applied to grinded samples of rice, beans, lentil seeds and chickpeas with the following result:  6.2 mg/kg in lentil seeds, 6.0 mg/kg in chickpeas, 3.2 mg/kg in red beans, and 1.7 mg/kg in rice.

Keywords : linear sweep voltammetry; complexes; trace analysis; molybdenum; 8- hydroxyquinoline; adsorptive preconcentration.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )