College of Biological and Environmental Engineering, Zhejiang Shuren University, Hangzhou 310015, China.
College of Biological and Environmental Engineering, Zhejiang Shuren University, Hangzhou 310015, China; Chemistry Department, Lomonosov Moscow State University, 1-3 Leninskie Gory, 119991 Moscow, Russian Federation.
J Chromatogr A. 2019 Mar 15;1588:169-173. doi: 10.1016/j.chroma.2019.01.007. Epub 2019 Jan 6.
An improved "heart-cut" column-switching method combining ion-exclusion column, monolithic anion exchange concentrator and capillary anion-exchange column is developed and successfully applied for the determination of inorganic anions (Cl, Br, NO and HPO) at trace level in weak acids. The quantitative determination of selected inorganic anions in the samples of fifteen weak acids and hydrogen peroxide are accomplished with analysis time of 45 min per sample. The obtained limits of detection (LODs) are in the range of 2.1-32.6 ng/L based on the s/n = 3 and injection volume of 50 μL. RSDs for retention time and peak area were all ≤1.89%. A spike-recovery study was performed under these conditions and satisfactory recoveries between 85.3 and 103.9% for all studied anions were obtained.
开发了一种改进的“心切”柱切换方法，结合离子排斥柱、整体阴离子交换浓缩器和毛细管阴离子交换柱，成功应用于痕量弱酸中无机阴离子（Cl、Br、NO 和 HPO）的测定。在 45 分钟/个样品的分析时间内，完成了 15 种弱酸和过氧化氢样品中选定无机阴离子的定量测定。基于 s/n=3 和 50 μL 的进样量，检测限（LOD）的范围为 2.1-32.6 ng/L。保留时间和峰面积的 RSD 均≤1.89%。在这些条件下进行了加标回收研究，所有研究的阴离子的回收率均在 85.3%至 103.9%之间。
