流动注射-火焰原子吸收光度法测定矿泉水中的锶

用流动注射离子交换系统于酸性条件下在线富集饮用天然矿泉水中的锶,火焰原子吸收光度法测定,共存成分无干扰,方法简便快速,富集倍数可随意调节。在 60 h～(-1)的进样频率下,灵敏度提高 17倍。用于矿泉水中锶的测定,当含量为 60～250 ng/ml时,相对标准偏差为 0.68％～0.94％。回收率为 94.4％～110.3％,检测限为 15ng/ml。

Determination of Trace Strontium in Natural Mineral Water by Flow Injection- Flame Atomic Absorption Spectrometry

A flow injection approach for the preconcentration of strontium from drinking natural mineral water based on ion exchange was developed. With a sampling frequency of 60 h-1, a concentration factor of 17 is achieved. As the preconcentration is carried out at an acidic condition, interferences caused by the foreign ions which are present in the sample can be eliminated. The method has been satisfactorily applied to the analysis of natural mineral water by flame atomic absorption spectrometry. The relative standard deviation is 0. 68% and 0. 94% for two samples containing Sr2+of 60-250 ng/mL, respectively, the recovery is in the range of 94. 4%-110. 3% , and the detection limit is 15 ng/mL.