螯合微柱在线预富集与流动注射原子光谱法测定钴
On-line preconcentration and determination of cobalt by chelating microcolumns and flow injection atomic spectrometry.
作者信息
Haji Shabani A M, Dadfarnia S, Dehghan K
机构信息
Department of Chemistry, Yazd University, Yazd 89195/741, Iran.
出版信息
Talanta. 2003 Mar 10;59(4):719-25. doi: 10.1016/S0039-9140(02)00609-4.
A simple and sensitive flow injection analysis-atomic absorption spectrometric procedure is described for the determination of cobalt. The method is based upon on-line preconcentration of cobalt on a microcolumn of 2-nitroso-1-naphthol immobilized on surfactant coated alumina. The trapped cobalt is then eluted with ethanol (250 microl) and determined by flame atomic absorption spectrometry. The analytical figures of merit for the determination of cobalt are as follows: detection limit (3 S), 0.02 ng ml(-1); precision (RSD), 2.8% for 20 ng ml(-1) and 1.7% for 70 ng ml(-1) of cobalt; enrichment factor, 125 (using 25 ml of sample). The method has been applied to the determination of cobalt in water samples, vitamin B(12) and B-complex ampoules and accuracy was assessed through recovery experiment and independent analysis by furnace AAS.
本文描述了一种简单且灵敏的流动注射分析-原子吸收光谱法测定钴。该方法基于钴在固定于表面活性剂包覆氧化铝微柱上的2-亚硝基-1-萘酚上进行在线预富集。然后用乙醇（250微升）洗脱捕获的钴，并通过火焰原子吸收光谱法进行测定。测定钴的分析性能指标如下：检测限（3S），0.02纳克/毫升；精密度（相对标准偏差），对于20纳克/毫升的钴为2.8%，对于70纳克/毫升的钴为1.7%；富集因子，125（使用25毫升样品）。该方法已应用于水样、维生素B12和复合维生素安瓿中钴的测定，并通过回收率实验和炉原子吸收光谱法的独立分析评估了准确性。
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