离子色谱法测定海水中的阳离子

DETERMINATION OF CATION IN SEAWATER BY ION CHROMATOGRAPHY

研究了离子色谱对海水中阳离子同时测定的方法。以36 mmol/L甲磺酸为淋洗液,流速为1 mL/min,每个样品的分析时间为30 min,采用分析柱为IonPac CS16,抑制电导检测。Li+、Na+、K+、Mg2+、Ca2+、Sr2+的方法检出限分别为0.18、0.16、0.38、0.46、1.1、9.7μg/L。海水中Mg2+、Ca2+测量的最佳精密度分别为0.15%和0.30%(n=5)。

Ion chromatography （IC）was developed for simultaneous determination of cation（Li^＋ , Na^＋ , K^＋ , Mg^2＋ , Ca^2＋ , Sr^2＋） in seawater. By a IonPac CG16 5 mm column and a DZS - 1 suppressor, 36 mmol/L MSA eluent was selected for the separation of cation with 1 mL/min flow rate. The elapsed time for each sample was taken within 30 min. The method detection limit （MDL） was 0.18, 0.16 ,0. 38 ,0. 46 ,1.1,9. 7 μg/L respectively for Li ^＋ , Na ^＋ , K ^＋ ,Mg^2 ＋ , Ca^2＋ and Sr^2 ＋ . The best measurement precision was 0.15% for Mg^2＋ and 0.30% for Ca^2＋ in seawater samples.