用H点标准加入法同时动力学测定Fe(III)和Fe(II)

Simultaneous kinetic determination of Fe(III) and Fe(II) by H-point standard addition method.

作者信息

Safavi A, Abdollahi H, Hormozi Nezhad M R

机构信息

Department of Chemistry, College of Sciences, Shiraz University, Shiraz 71454, Iran.

出版信息

Talanta. 2002 Mar 11;56(4):699-704. doi: 10.1016/s0039-9140(01)00635-x.

DOI:10.1016/s0039-9140(01)00635-x

PMID:18968545

Abstract

The H-point standard addition method (HPSAM) was applied to kinetic data for simultaneous determination of Fe(III) and Fe(II) or selective determination of Fe(III) in the presence of Fe(II). The method is based on the difference in the rate of two processes; reduction of Fe(III) with Co(II) and subsequent complex formation of resulted Fe(II) with 1,10-phenanthroline, and direct complex formation between Fe(II) and 1,10-phenanthroline in pH 3 and cetyl trimethyl ammonium bromide, CTAB, micellar media. Fe(III) can be determined in the range of 0.75-5.13 mug ml(-1)with satisfactory accuracy and precision in the presence of excess Fe(II) under working conditions. The proposed method was successfully applied to the simultaneous determination of Fe(III) and Fe(II) and also to the selective determination of Fe(III) in the presence of Fe(II) in several synthetic mixtures containing different concentration ratios of Fe(III) to Fe(II).

摘要

采用H点标准加入法（HPSAM）处理动力学数据，用于同时测定Fe(III)和Fe(II)，或在Fe(II)存在下选择性测定Fe(III)。该方法基于两个过程速率的差异：Fe(III)与Co(II)的还原反应以及所得Fe(II)与1,10-菲啰啉随后形成配合物的过程，以及在pH 3和十六烷基三甲基溴化铵（CTAB）胶束介质中Fe(II)与1,10-菲啰啉直接形成配合物的过程。在工作条件下，当存在过量Fe(II)时，Fe(III)的测定范围为0.75 - 5.13 μg ml⁻¹，具有令人满意的准确度和精密度。所提出的方法成功应用于同时测定Fe(III)和Fe(II)，也用于在含有不同Fe(III)与Fe(II)浓度比的几种合成混合物中，在Fe(II)存在下选择性测定Fe(III)。