固相萃取-电感耦合等离子体质谱法测定海水中22种痕量金属元素

Determination of twenty-two trace elements in seawater by solid phase extractioninductively coupled plasma mass spectrometry

建立了以亚氨基二乙酸型螯合树脂为填料的固相萃取分离富集、电感耦合等离子体质谱法(ICP-MS)测定海水中22种痕量金属元素的新方法。将海水pH调至8.5~9.0,15%硝酸为洗脱溶液,萃取分离富集海水中22种元素,ICP-MS对洗脱溶液进行定量分析。实验结果表明:在优化的实验条件下,方法的相对标准偏差(RSD)为2.5%~4.8%,检出限为0.008~0.052μg/L,测定下限为0.032~0.208μg/L,添加不同浓度的标准溶液,加标回收率为80.0%~108.0%。建立的方法操作简单、灵敏、高效,实现了海水中22种金属元素的绿色分离和快速检测,为海洋化学、海洋环境研究提供技术支撑。

With iminodiacetic acid type chelating resin as filler,a method for the determination of twenty-two trace metal elements in seawater by inductively coupled plasma mass spectrometry(ICP-MS)after solid phase extraction separation and preconcentration was established.Adjusting the pH value of seawater to 8.5-9.0,15%nitric acid was used as the elution solution to extract.Twenty-two trace elements in seawater were extracted and enriched.The elution solution was quantitatively analyzed using ICP-MS.The result of experiment show that:Under optimized experimental conditions,the relative standard deviation(RSD)of the method was 2.5%-4.8%,and the detection limit was 0.008-0.052μg/L,lower limit of measurement was 0.032-0.208μg/L,Adding standard solution of different concentrations,the recovery rates were 80.0%-108.0%.The established method was easy to operate,sensitive and efficient,achieving green separation and rapid detection of twenty-two elements in seawater.It provided technical support for marine chemistry and marine environmental research.