在线稀释-离子色谱法测定造纸法烟草薄片中阳离子含量

Determination of Cation Content in Papermaking Reconstituted Tobacco Sheet by On-line Dilution-ion Chromatography

关键词:  造纸法烟草薄片  阳离子含量测定  离子色谱法  定量环在线稀释

Key Words:papermaking reconstituted tobacco sheet  determination of cation content  ion chromatography  quantitative loop on-line dilution

摘要:本研究开发了一种采用定量环在线稀释-离子色谱法检测造纸法烟草薄片中Li⁺、Na⁺、NH4+、K⁺、Mg²⁺、Ca²⁺阳离子含量的方法，以外标法定量。在0.1 g样品用50 mL 0.01 mol/L盐酸水溶液室温振荡萃取30 min的条件下，检出限、定量限分别可达0.011~0.031 μg/mL、0.034~0.094 μg/mL，线性相关系数达0.998以上；日内重复性和日间重现性分别为2.14%~3.86%、2.57%~4.52%，表明该方法的重复性和重现性较好。在3种不同阳离子浓度下，加标回收率在95.8%~107.3%之间，相对标准偏差（RSD）在1.53%~4.51%之间。结果表明，此方式方便快捷，适用于大通量检测，检测结果准确度明显优于人工稀释方式，且精密度提升明显。经检验，不同造纸法烟草薄片样品中所含阳离子的种类存在差异，且含量差异较大。

Abstract:In this study， a method was developed for the determination of cations， such as Lithium， Sodium， Ammonia， Potassium， Magnesium and Calcium， in paper-making reconstituted tobacco sheet using quantitative loop on-line dilution-ion chromatography （IC）， with external-standard quantitative method. When 0.1 g of sample was extracted with 50 mL of 0.01 mol/L hydrochloric acid for 30 min at room temperature with shaking， the LODs and the LOQs of target cations could achieve 0.011~0.031 μg/mL and 0.034~0.094 μg/mL， respectively， while the determination coefficients were more than 0.998. The Intra-assay repeatability and Inter-assay reproducibility were 2.14%~3.86% and 2.57%~4.52%， respectively， indicating the better repeatability and reproducibility. With three different cation concentrations， the recovery rates for the target cations were in the range of 95.8% and 107.3%， and the relative standard deviation （RSD） was in the range of 1.53~4.51. The results showed that this method was convenient and fast， suitable for large throughput detection， of which the accuracy of detection results was significantly better than that of manual dilution method， with the precision significantly improved. It was proved that the types and content of cations in the paper-making reconstituted tobacco sheet samples were different， and the content varied widely.