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Flow‐Injection Pulsed‐Amperometric Determination of Free Glycerol in Biodiesel at a Gold Electrode
Author(s) -
Barbosa Tatielli G. G.,
Richter Eduardo M.,
Muñoz Rodrigo A. A.
Publication year - 2012
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.201100719
Subject(s) - amperometry , electrode , detection limit , flow injection analysis , analytical chemistry (journal) , materials science , biodiesel , linear range , working electrode , chromatography , chemistry , electrochemistry , organic chemistry , catalysis
This work reports the highly‐sensitive amperometric determination of free glycerol in biodiesel at a gold electrode adapted in a flow‐injection analysis (FIA) cell. The amperometric method involved the continuous application of three sequential pulses to the working electrode (+250 mV, +700 mV, and −200 mV, for 100 ms each). This sequence of potential pulses eliminated electrode passivation and dramatically increased the analytical signal. The proposed FIA‐amperometric method presented low relative standard deviation between injections (1.5 %, n =15), high analytical frequency (85 h −1 ), satisfactory recovery values (93–118 %) for spiked samples, wide linear range (from 1 to 300 µmol L −1 ), and low detection limit (0.5 µmol L −1 ).