Determination of nickel after online sorbent preconcentration by FI-FAAS using dimethylglyoxime as a complexing agent

被引:37
作者
Ali, A [1 ]
Ye, YX [1 ]
Xu, GM [1 ]
Yin, XF [1 ]
Zhang, T [1 ]
机构
[1] Zhejiang Univ, Dept Chem, Hangzhou 310027, Peoples R China
关键词
nickel; flow injection; AAS; online sorbent extraction; dimethylglyoxime;
D O I
10.1006/mchj.1999.1799
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Dimethylglyoxime (DMG) has been tested as a complexing agent for the determination of nickel after online preconcentration on RP-C-18 in a microcolumn using flow injection coupled with a flame atomic absorption spectrometry system (FI-FAAS). The Ni-DMG complexes formed online can be adsorbed on the C-18 sorbent. Various parameters affecting the online Ni-DMG complex formation and its subsequent adsorption in the microcolumn as well as its elution into the nebulizer of the FAAS were optimized. A 10(-3) mol/L solution of DMG in 4% ethanol was mixed online with an aqueous sample solution acidified to 0.1% (v/v) nitric acid and Rowed for 30 a through the microcolumn. The adsorbed Ni-DMG complex in the microcolumn was eluted with ethanol containing 1% HNO3 into the nebulizer of the FAAS in 10 s. A good precision (RSD = 1.7%, n = 14), high enrichment factor (2I), and high sample throughput (90 h(-1)) with detection limit (3 sigma) 3 mu g/L were obtained. The method was applied to standard reference materials, i.e., NBS-362, NBS-364 (special low-alloy steel), and mussel (GBW 08571), for the determination of nickel and the results were in good agreement with certified values. Nickel recovery from seawater and high-purity magnesium oxide in the range 98-100% can be obtained by this method, (C) 1999 Academic Press.
引用
收藏
页码:365 / 373
页数:9
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