Zeng Wenfang, Chen Yongxin, Cui Hairong, Wu Feiyan, Zhu Yan, Fritz James S
Department of Chemistry, Xixi Campus of Zhejiang University, Hangzhou, Zhejiang 310028, China.
J Chromatogr A. 2006 Jun 16;1118(1):68-72. doi: 10.1016/j.chroma.2006.01.065. Epub 2006 Feb 14.
A single-column method for the simultaneous determination of common cations and transition metals in real samples is proposed in this paper. Eleven cations (copper, lithium, sodium, ammonium, potassium, cobalt, nickel, magnesium, calcium, strontium and zinc) were separated and analyzed by means of ion chromatography using an isocratic elution with 2.5 mM methane sulfonic acid and 0.8 mM oxalic acid as mobile phase, IonPac SCS1 (250 mm x 4 mm I.D.) as the separation column and non-suppressed conductor detection. Optimized analytical conditions were further validated in terms of accuracy, precision and total uncertainty and the results showed the reliability of the IC method. The relative standard deviations (RSDs) of the retention time and peak area were less than 0.04 and 1.30%, respectively. The coefficients of determination for cations ranged from 0.9988 to 1.000. The method developed was successfully applied to determination of cations in samples of beer and bottled mineral water. The spiked recoveries for the cations were 94-106%. The method was applied to beer and beverage without interferences.
本文提出了一种用于同时测定实际样品中常见阳离子和过渡金属的单柱法。采用离子色谱法，以2.5 mM甲磺酸和0.8 mM草酸作为流动相进行等度洗脱，使用IonPac SCS1（250 mm×4 mm内径）分离柱和非抑制型电导检测，对11种阳离子（铜、锂、钠、铵、钾、钴、镍、镁、钙、锶和锌）进行分离和分析。在准确度、精密度和总不确定度方面对优化后的分析条件进行了进一步验证，结果表明该离子色谱法具有可靠性。保留时间和峰面积的相对标准偏差（RSD）分别小于0.04%和1.30%。阳离子的测定系数范围为0.9988至1.000。所建立的方法成功应用于啤酒和瓶装矿泉水样品中阳离子的测定。阳离子的加标回收率为94% - 106%。该方法应用于啤酒和饮料时无干扰。
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