Premium
Application of adsorptive stripping voltammetry to trace measurements of molybdenum in plant materials
Author(s) -
Karakaplan Mustafa,
Henze GÜNter
Publication year - 1993
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140050717
Subject(s) - molybdenum , hanging mercury drop electrode , adsorptive stripping voltammetry , chloranilic acid , chemistry , cathodic stripping voltammetry , stripping (fiber) , detection limit , adsorption , supporting electrolyte , atomic absorption spectroscopy , mercury (programming language) , voltammetry , analytical chemistry (journal) , trace amounts , anodic stripping voltammetry , inorganic chemistry , electrolyte , chromatography , electrochemistry , electrode , materials science , medicine , physics , alternative medicine , organic chemistry , composite material , quantum mechanics , pathology , computer science , programming language
A procedure is presented for quantifying molybdenum in dry ashed plant samples. The determination is made by adsorptive stripping voltammetry in the differential pulse mode (DPAdSV). It is based on the adsorptive accumulation of the Mo(VI)‐chloranilic acid complex on the surface of a hanging mercury drop, followed by the reduction of the adsorbed complex. Optimal conditions are stirred acidified supporting electrolyte solution (of pH 2–3), containing 10 −3 mol/L chloranilic acid and an accumulation potential of −0.20 V (vs. Ag/AgCl, 3 mol/L KCl). The height of the cathodic stripping peak around −0.60 V depends linearly on the molybdenum concentration and accumulation time (over the ranges 0–12 ng/ml and 0–300 seconds, respectively). For an accumulation period of 5 minutes, the detection limit is 0.02 ng/ml. Possible interferences by other trace metals are investigated. The proposed procedure has been applied to the determination of molybdenum traces in a variety of plants with good accuracy and precision. The results are in good agreement with those obtained by atomic absorption spectrometry.