Faculty of Chemistry, Maria Curie Sklodowska University, 20-031 Lublin, Poland.
Talanta. 2012 Jan 15;88:427-31. doi: 10.1016/j.talanta.2011.11.012. Epub 2011 Nov 6.
A sensitive and highly selective adsorptive stripping voltammetric procedure for determination of traces of Cr(VI) is presented. Cr(III) interference was minimized due to (a) partial adsorption of this form of chromium from the sample on aluminum oxide and (b) using as a detection method adsorptive stripping voltammetry, which allows for selective determination of Cr(VI) in the presence of a 100-fold excess of Cr(III). The procedure can be used for determination of Cr(VI) even in the presence of a 10,000-fold excess of Cr(III). Conditions of Cr(III) adsorption on aluminum oxide were optimized while conditions of Cr(VI) determination were based on literature data. The calibration graph for Cr(VI) for an accumulation time of 30s was linear from 1×10(-9) to 4×10(-8)molL(-1). The detection limit was 7×10(-10)molL(-1). The proposed procedure was applied for Cr(VI) determination in a river water sample.
提出了一种用于测定痕量 Cr(VI) 的灵敏且高选择性的吸附溶出伏安法。由于（a）从样品中部分吸附这种形式的铬到氧化铝上，以及（b）使用吸附溶出伏安法作为检测方法，从而可以最小化 Cr(III) 的干扰，该方法允许在存在 100 倍过量的 Cr(III) 的情况下选择性地测定 Cr(VI)。该方法甚至可以在存在 10,000 倍过量的 Cr(III)的情况下用于测定 Cr(VI)。优化了 Cr(III)在氧化铝上吸附的条件，而 Cr(VI)的测定条件则基于文献数据。在 30s 的积累时间下，Cr(VI)的校准曲线在 1×10(-9)至 4×10(-8)molL(-1)之间呈线性。检测限为 7×10(-10)molL(-1)。该方法已应用于河水样品中 Cr(VI)的测定。
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