Sumida Takashi, Sabarudin Akhmad, Oshima Mitsuko, Motomizu Shoji
Kochi Prefectual Industrial Technology Center, Nunoshida 3992-3, Kochi 781-5101, Japan.
Anal Sci. 2006 Jan;22(1):161-4. doi: 10.2116/analsci.22.161.
A method for the preconcentration and speciation of chromium in seawater was developed. On-line preconcentration and determination were carried out by using inductively coupled plasma atomic emission spectrometry (ICP-AES) with dual mini-columns containing a chelating resin. In this system, Cr(III) was collected on the first column. The effluent containing residual chromium from the first column was collected on the second column after passing through a reduction-switching unit, in which the reducing agent was introduced, or not, for the reduction of Cr(VI) to Cr(lII). Cr(VI) was determined as the difference between the concentration of pre-reduced Cr(VI) and Cr(III) in the effluent from the first column. The detection limits for Cr(III) and Cr(VI) were 0.04 and 0.09 microg l(-1), respectively.
开发了一种海水中铬的预富集和形态分析方法。采用电感耦合等离子体原子发射光谱法（ICP-AES）和含有螯合树脂的双微型柱进行在线预富集和测定。在该系统中，Cr(III) 在第一根柱上被收集。来自第一根柱的含有残留铬的流出物在通过还原切换单元后被收集在第二根柱上，在还原切换单元中引入或不引入还原剂以将Cr(VI) 还原为Cr(III)。Cr(VI) 被测定为第一根柱流出物中预还原的Cr(VI) 和Cr(III) 浓度之间的差值。Cr(III) 和Cr(VI) 的检测限分别为0.04和0.09 μg l(-1)。
