Simultaneous determination of traces of iron(II) and iron(III) using differential pulse anodic stripping voltammetry in a flow-through configuration on a glassy carbon electrode
1998; Elsevier BV; Volume: 376; Issue: 3 Linguagem: Inglês
10.1016/s0003-2670(98)00518-2
ISSN1873-4324
AutoresJacobus F. van Staden, Mangaka C. Matoetoe,
Tópico(s)Electrochemical sensors and biosensors
ResumoIron(II) and iron(III) complexes of pyrophosphate can be determined simultaneously at pH 9. The peak potentials used were −0.8 and 0.5 V for Fe(III) and Fe(II), respectively. Linear calibration plots over the range 10−6–10−3 mol l−1 were obtained. Detailed iron-couple cyclic voltammetric studies, sample handling procedures, possible interferences and applications of the method to real samples are described. Detection limits of 10−8 mol l−1 and a relative standard deviation of <4% (n=14) were achieved at a concentration of 1×10−6 mol l−1 for both iron species.
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