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Adsorptive Cathodic Stripping Voltammetric Determination of Molybdenum in Synthetic Solutions and Environmental Samples
Author(s) -
Ali Azza M. M.,
Ghandour Mahmoud A.,
ElShatoury Salah A.,
Ahmed Seddique M.
Publication year - 2000
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/(sici)1521-4109(200002)12:2<155::aid-elan155>3.0.co;2-j
Subject(s) - hanging mercury drop electrode , adsorptive stripping voltammetry , cathodic stripping voltammetry , detection limit , chemistry , molybdenum , stripping (fiber) , supporting electrolyte , metal ions in aqueous solution , mercury (programming language) , voltammetry , electrolyte , aqueous solution , molybdenum blue , anodic stripping voltammetry , metal , inorganic chemistry , analytical chemistry (journal) , phosphate , chromatography , electrode , electrochemistry , materials science , organic chemistry , composite material , computer science , programming language
A sensitive and selective voltammetric methods has been developed for the determination of trace amounts of Mo(VI) ions. This method is based on controlled adsorptive preconcentration of molybdenum species on the hanging mercury drop electrode (HMDE) using mixtures of nitrate and phosphate as supporting electrolytes. The adsorptive stripping response was evaluated with respect to preconcentration time, potential and composition of supporting electrolyte. The method used is cathodic linear sweep stripping voltammetry (CLSSV). The detection limit found was 1×10 –8 M using 120 s. as accumulation time. The precision of the method is satisfactory with relative standard deviation of 1.4% with five replicates at 1×10 –6 M Mo(VI). The effect of various surface active substances (SAS) as well as different metal cations and anions in synthetic aqueous solutions has been investigated. Also this method has been applied for the determination of Mo(VI) in environmental samples; e.g., soil, natural water and indoor airborne particulate.