抑制型离子色谱测定纳米金刚石粉末表面吸附的阴离子

Determination of Anions Absorbed on the Surface of Nano-sized Diamond by Suppressed Ion Chromatography

采用抑制型离子色谱法 ,以NaHCO3 Na2 CO3作流动相 ,测定了纳米金刚石粉末表面吸附的F- 、Cl- 、SO2 -4 、NO-3等阴离子的浓度 ,研究了淋洗液浓度对离子保留的影响以及样品处理中超声洗脱分散时间对测定结果的影响。适宜的流动相为 0 .85mmol LNaHCO3+0 .9mmol LNa2 CO3;超声洗脱分散时间应在 1 0min以上。在此流动相条件下测定了上述 6种阴离子的检出限及其它定量参数。方法应用于纳米金刚石粉末试样的分析 。

A method was developed for the determination of F-, Cl-, SO42-, NO3- and other anions absorbed on the surface of nano-sized diamond by suppressed ion chromatography with NaHCO3/Na2CO3 as eluent. The effects of eluent concentration on the retention time of the anions and the effects of the dispersed time of the samples on analysis results were studied. It was found that the retention times decreased with the increasing of NaHCO3 and/or Na2CO3 concentrations, and the optimum concentration of the eluent was 0.85 mmol/L NaHCO3 + 0.9 mmol/L Na2CO3. The dispersed time of the samples should be more than 10 minutes. This method has been applied to the determination of the anions in some nano-sized diamonds with satisfactory results.