Komersová A, Bartos M, Kalcher K, Vytras K
Department of Analytical Chemistry, University of Pardubice, Czech Republic.
J Pharm Biomed Anal. 1998 Apr;16(8):1373-9. doi: 10.1016/s0731-7085(97)00193-3.
Application of differential-pulse cathodic stripping voltammetry using a carbon paste electrode (consisting of carbon powder and liquid paraffin) have been investigated for trace determination of iron in 5-aminoisophthalic acid (AIPA). Samples were dissolved in 1 M HC1, pH was adjusted to 4-5 after addition of EDTA. Voltammetric measurements were performed after filtration. No sample decomposition (mineralization) was necessary. The method showed a good linearity between current and concentration from 3 x 10(-7) to 5 x 10(-5) mol dm-3 of iron, with a detection limit of 3 x 10(-7) mol dm-3 (resp. 1 ppm in solid AIPA). The results agreed well to those obtained by atomic absorption spectrometry (AAS) using electrothermic atomisation. For AAS measurement, however, microwave digestion of samples was necessary.
研究了使用碳糊电极（由碳粉和液体石蜡组成）的差分脉冲阴极溶出伏安法在5-氨基间苯二甲酸（AIPA）中痕量测定铁的应用。将样品溶解于1 M盐酸中，加入乙二胺四乙酸（EDTA）后将pH值调至4 - 5。过滤后进行伏安测量。无需对样品进行分解（矿化）。该方法在铁浓度为3×10⁻⁷至5×10⁻⁵ mol dm⁻³之间时，电流与浓度呈现良好的线性关系，检测限为3×10⁻⁷ mol dm⁻³（相当于固体AIPA中1 ppm）。结果与采用电热原子化的原子吸收光谱法（AAS）所获得的结果吻合良好。然而，对于AAS测量，样品需要进行微波消解。
