A hydride generation atomic fluorescence spectrometric procedure for selenium determination after flow injection on-line co-precipitate preconcentration

作者：Tang XD; Xu ZR; Wang JH^*

来源：Spectrochimica Acta Part B: Atomic Spectroscopy , 2005, 60(12): 1580-1585.

DOI：10.1016/j.sab.2005.10.005

• flow injection on-line co-precipitation
• PTFE beads packed column
• hydride generation
• atomic fluorescence spectrometry
• selenium

A flow injection (FI) on-line preconcentration procedure for ultra-trace inorganic selenium was developed with detection by atomic fluorescence spectrometry. Selenium (IV) is co-precipitated with lanthanum hydroxide and collected on a PTFE beads packed column, the precipitate is afterwards dissolved with hydrochloric acid followed by hydride generation with reduction by tetrahydroborate. A thorough scrutiny was made for chemical variables and FI parameters. With a sampling volume of 3.4 ml, quantitative retention of selenium (IV) was obtained, along with an enrichment factor of 11 and a sampling frequency of 38 h(-1). The detection limit, defined as 3 times the blank standard deviation (3 sigma), was 5 ng l(-1). The precision was characterized by a RSD value of 1.2% (at the 0.5 mu g l(-1) level, n = 11). The enrichment factor was further enhanced to 20 along with a detection limit of 3 ng l(-1), with a sample loading volume of 6.8 ml. The procedure was validated with certified reference materials and biological samples. It was also applied to the speciation of inorganic selenium in surface waters.

• 出版日期2005-12
• 单位东北大学