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Sensitive Differential Pulse Polarographic Determination of Molybdenum Using The New Catalytic System Mo(VI)‐Phenantroline‐Chlorate
Author(s) -
Bobrowski Andrzej,
Królicka Agnieszka,
Zarębski Jerzy
Publication year - 2007
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.200603674
Subject(s) - polarography , detection limit , chemistry , catalysis , chlorate , molybdenum , chloride , inorganic chemistry , nuclear chemistry , chromatography , organic chemistry
It was found that in acidic chloride media the complex of Mo(VI) with 1,10‐phenantroline induces catalytic reduction of KClO 3 . This catalytic effect can be utilized for sensitive differential pulse polarographic determination of Mo(VI) with a low detection limit of 2.9×10 −11 M (2.8 ng/L). The optimal Mo(VI) response was obtained at pH 2.8, in the presence of (6–12)×10 −5 M 1,10‐phenantroline and 2×10 −2 M KClO 3 . The sensitivity was 1.73 nA/nM and the catalytic response was linear up to 7.5×10 −7 M Mo (VI). The interferences from inorganic ions and surface‐active substances were investigated. The results of the determination of Mo(VI) in CRM water sample showed good reproducibility (R.S.D. for standard solution is below 1.2% and for water samples is 8.9%) and accuracy of the elaborated catalytic polarographic method.