流动注射固相萃取预富集原子吸收光谱测定铁的价态

Determination of Iron Valence State by FI On line Sorbent Preconcentration Coupled with FAAS Using 1, 10-Phenanthroline

中文关键词:  流动注射  Fe²⁺  Fe³⁺  火焰原子吸收光谱  邻菲罗啉

英文关键词:flow injection analysis  flame atomic absorption spectrometry  Iron(Ⅱ)  Iron(Ⅲ)  1,10-phenanthro-line

中文摘要:

      研究了流动注射固相萃取预富集火焰原子吸收光谱测定铁价态的方法.该方法用C₁₈微柱萃取富集Fe²⁺与邻菲罗啉形成的配合物,乙醇洗脱配合物,原子吸收光谱检测Fe²⁺,用抗坏血酸还原溶液中的Fe³⁺测总铁,Fe³⁺的量可由总铁与Fe²⁺的差求得.该方法快速、方便且灵敏度高,用于水样的分析,结果令人满意.

英文摘要:

      A rapid, sensitive and automatic method for determination of differential valence state of Fe²⁺ and Fe³⁺ after on-line preconcentration of Fe²⁺ in a RP-C₁₈ microcolumn using 1,10 phenanthroline as a complexing agent with FAAS has been developed. The absorbed Fe²⁺ phen complex in the microcolumn has been eluted with ethanol into the nebulizer of FAAS, and ascorbic acid for the reduction of Fe³⁺ to Fe²⁺ has been used. Various parameters affecting complex formation and the subsequent complex absorption in the microcolumn were optimized. A good precision (%RSD=1.1 for 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 synthetic water samples for the valence state determination of iron with the recovery 94.5%～103.6%。