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Catalytic Adsorptive Stripping Chronopotentiometric Determination of Hexavalent Chromium at a Silver Amalgam Film Electrode of Prolonged Application
Author(s) -
Bobrowski Andrzej,
Kapturski Paweł,
Zarębski Jerzy
Publication year - 2011
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.201100237
Subject(s) - stripping (fiber) , hexavalent chromium , chromium , electrode , amalgam (chemistry) , detection limit , catalysis , deposition (geology) , chemistry , nitrate , repeatability , inorganic chemistry , analytical chemistry (journal) , materials science , metallurgy , environmental chemistry , chromatography , composite material , paleontology , biochemistry , organic chemistry , sediment , biology
The paper reports on the application of stripping chronopotentiometry for the determination of chromium(VI) at a silver‐based amalgam film electrode. It is the first attempt to apply such a detection system for the speciation of chromium. The procedure utilized catalytic reduction of nitrate ions induced by the instantaneous chromium(III)‐DTPA complex, accumulated at the electrode surface. The chronopotentiometric step is realized in the constant current mode. Several key parameters, such as the deposition potential, deposition time, nitrate concentration and stripping current were optimized. The detection limit obtained for 15 s of accumulation time was estimated at 0.025 µg/L. The repeatability of the signal was 6.1 %.