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

摘要

Iron(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 x 10(-6) mol l(-1) for both iron species. (C) 1998 Elsevier Science B.V. All rights reserved. [References: 18]