3.5 毛细管
离子色谱仪的研制
Dasgupta等[51]报道了一套毛细管
离子色谱系统,采用毛细管
离子色谱柱为180 μm i.d.×56 cm,填充Dionex AS11阴离子交换填料,纯水通过电渗析流动相发生器产生NaOH,抑制器80~100 μm内径,长11 mm,配有毛细管池的电导检测器。流速2 μL/min(线速度13 mm/s)时,柱压<56 MPa。用毛细管填充柱和抑制电导检测体系分离无机和有机阴离子。他们还研制了一种野外便携式
离子色谱仪,仪器外观28 cm×43 cm×15 cm,质量10 kg[52]。在电渗析流动相发生器之前使用一个捕集柱去除杂质。采用180 μm i.d.×50 cm填充毛细管柱,带有抑制电导检测系统,检出限可达μg/L级。Boring等[53]采用预浓缩柱与上述毛细管
离子色谱柱联用,检测了μg/m3级的可离子化气体。
4 展望
目前,有关毛细管
离子色谱的研究在
离子色谱领域得到了高度的重视。毛细管
离子色谱可以大大节省流动相的消耗,对于动态改性固定相的研究,可以降低研究费用。整体柱在快速分离方面具有很明显的优势。有机聚合整体柱的制备过程又非常简单,制备高效、快速分离的毛细管
离子色谱整体柱是目前以及今后一段时间内研究的重点。目前,本实验室研制了内径为032 mm的强阳离子交换毛细管整体柱,成功地用于饮用水中Ca和Mg的测定;还制备了高离子交换容量的毛细管离子交换整体柱,柱长仅为15 cm,在60 mm/s的高流速下,5 min内分离了4种蛋白质。在毛细管
离子色谱检测器的研究中,非接触电导检测器具有池体积小,电极不受污染,使用寿命高等优点,具有很好的发展前景。
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