Selective Determination of Beryllium(II) Ion at Picomole per Decimeter Cubed Levels by Kinetic Differentiation Mode Reversed-Phase High-Performance Liquid Chromatography with Fluorometric Detection Using 2-(2‘-Hydroxyphenyl)-10-hydroxybenzo[<i>h</i>]quinoline as Precolumn Chelating Reagent
作者:Hiroaki Matsumiya、Hitoshi Hoshino
DOI:10.1021/ac0260847
日期:2003.2.1
A highly sensitive and selective method for the determination of the Be(II) ion has been developed by the use of reversed-phase high-performance liquid chromatography (HPLC) with fluorometric detection using 2-(2‘-hydroxyphenyl)-10-hydroxybenzo[h]quinoline (HPHBQ) as a precolumn (off-line) chelating reagent. The reagent HPHBQ has been designed to form the kinetically inert Be chelate compatible with high fluorescence yield, which is appropriate to the HPLC-fluorometric detection system. The Be−HPHBQ chelate is efficiently separated on a LiChrospher 100 RP-18(e) column with a methanol (58.3 wt %)−water eluent containing 20 mmol kg-1 of tartaric acid and is fluorometrically detected at 520 nm with the excitation at 420 nm. Under the conditions used, the concentration range of 20−8000 pmol dm-3 of Be(II) ion can be determined without interferences from 10 μmol dm-3 each of common metal ions, typically Al(III), Cu(II), Fe(III), and Zn(II), and still more coexistence of Ca(II) and Mg(II) ions at 0.50 mmol dm-3 and 5.0 mmol dm-3, respectively, is tolerated. The detection limit (3σ baseline fluctuation) is 4.3 pmol dm-3 (39 fg cm-3). The extraordinarily high sensitivity with toughness toward the matrix influence was demonstrated with the successful application to environmental Be analyses, such as determination of Be in rainwater and tap water.
利用反相高效液相色谱(HPLC)结合荧光检测法,采用2-(2'-羟基苯基)-10-羟基苯并[h]喹啉(HPHBQ)作为前柱(离线)螯合剂,开发了一种高灵敏度和选择性的Be(II)离子测定方法。设计了HPHBQ试剂,使其能形成动力学上不活泼的Be螯合物,并且具有高荧光产率,适合于HPLC-荧光检测系统。在含有20 mmol kg-1 酒石酸的甲醇(58.3 wt %)-水溶液中,Be−HPHBQ螯合物在LiChrospher 100 RP-18(e)柱上被高效分离,并在420 nm激发下于520 nm处进行荧光检测。在所用条件下,Be(II)离子的浓度范围为20−8000 pmol dm-3,不受常见金属离子(如Al(III)、Cu(II)、Fe(III)和Zn(II),各10 μmol dm-3)以及Ca(II)和Mg(II)离子分别共存于0.50 mmol dm-3和5.0 mmol dm-3的影响。检测限(3σ基线波动)为4.3 pmol dm-3(39 fg cm-3)。该方法极佳的灵敏度和对基质影响的强韧性通过对环境样品中Be的分析得到了验证,例如对雨水和自来水中的Be进行测定。