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《Chemical Research In Chinese Universities》 2000-03
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Determination of Iron(Ⅱ) and Total Iron Using Flow Injection On line Preconcentration With FAAS

XU Guang Ming, YE Ying Xue, YIN Xue Feng *, SHEN Hong, Akbar Ali (Department of Chemistry, Zhejiang University, Hangzhou 310027, China)  
A direct, rapid and sensitive method for the determination of Fe(Ⅱ) and Fe(Ⅲ) in water samples by flame absorption spectrometry coupled with flow injection on line preconcentration with 1,10 phenanthroline(\{1,10 phen\}) as the complex agent was developed. Various parameters affecting the complex formation and its subsequent adsorption, such as pH of the mixture solution, \{1,10 phen\} concentration, sample flow rate etc. were optimized. A 2 5×10 -3 mol/L 1,10 phen in 2 0% ethanol was on line mixed with aqueous sample solution of iron in 0 1%(volume ratio) hydrochloric acid and flowed through the microcolumn for 30 s. Fe(Ⅱ) can be extracted as Fe(Ⅱ) phen complex in the C 18 microcolumn and determined within 10 s in the nebulizer of FAAS after being eluted by ethanol. Ascorbic acid(0 1 mg/mL) was used for the reduction of Fe(Ⅲ) to Fe(Ⅱ). A good precision(RSD=1 1%, n =10), high enrichment factor(19) and sample throughput(80 h) with detection limit 3 μg/L were obtained. The method has been successfully applied on the water sample for Fe(Ⅱ) and Fe(Ⅲ) determination with the recovery 94%—105%.
【Fund】: 浙江省自然科学基金资助
【CateGory Index】: O658
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