Iron determination after on-line sorbent preconcentration by fi-fass using 1, 10-phenanthroline as a complexing agent |
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| Authors: | Akbar Ali Ye Ying-xue Xu Guang-ming Zhang Tao Yin Xue-feng Jin Xin |
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| Institution: | (1) Dept. of Chemistry, Yuquan Campus of Zhejiang University, 310027 Hangzhou, China;(2) Zhejiang Environmental Monitoring Centre, 310012 Hangzhou, China |
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| Abstract: | 1, 10-Phenanthroline (phen) was tested as a complexing agent for on-line preconcentration of iron on RP-C18 material in a microcolumn with flow injection coupled with flame atomic absorption spectrometer (FI-FAAS). The on-line formed
Fe(II)-phen complexes were adsorbed on the C18 sorbent material. Various parameters affecting the on-line Fe(II)-phen complex formation and its subsequent adsorption in
the microcolumn as well as its elution into the nebulizer of AAS were optimized. A 2.5×10−3 mol/L phen in 2% through the microcolumn for 30 s. The adsorbed Fe(II)-phen complexes in the microcolumn were eluted with
ethanol in 10 s into the nebulizer of AAS. Ascorbic acid (5×10−4 mol/L) was added to the sample solution for the reduction of Fe(III) to Fe(II). A good precision (RSD=1.1%,n=10), high enrichment factor (19) and sample throughput (90 h−1) with detection limit (3σ) of 3 μg/L were obtained. The method was applied on standard reference materials (i. e. mussel
and tomato leaves,) for iron determination and yielded results agreeing well with certified values.
Project supported by the Zhejiang Provincial Natural Science Foundation of China and Zhejiang Environmental Protection Foundation
From Pakistan Institute of Nuclear Science & Technology, Islamabad, Pakistan and now ZJ University, Ph. D. student. |
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| Keywords: | iron flow injection AAS on-line sorbent extraction 1 10-phenanthroline |
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