AbstractThe study concerns a very sensitive electroanalytical method, based on derivative chronopotentiometry of the chromium(III) complex with 2‐(5′‐bromo‐2′‐pyridylazo)‐5‐diethyl aminophenol (5‐Br‐PADAP) accumulated adsorptively on the surface of a hanging mercury drop electrode. The detection limit is 6 × 10−11mol/L for a preconcentration time of 6 min. The mechanism of the electrode reaction has been
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