Stepwise spectrophotometric determination of trace amounts of copper and iron using a teflon-tube on-line concentration method.

艾尓肯 依不拉音, 板垣 昌幸, 渡辺 邦洋

doi:10.2116/bunsekikagaku.49.515

The preconcentration of copper and iron using a Teflon tube in the line-adsorption method was investigated for flow-injection analysis(FIA).A Teflon tube treated with an alkaline solution was used as an adsorbent(inner diameter, 0.5mm;length, 6.00m).Moreover, the conditions on the determination of copper and iron and the flow system on the FIA were examined after separation with a 0.5M HCl solution(0.15ml)from the concentration Teflon tube.The copper and iron were determined with 2-(5-bromo-2-pyridylazo)-5-[N-n-propyl-N-(3-sulfo-propyl)amino]aniline(5-Br-PSAA)by spectrophotometry at 558nm.Copper(II)was determined directly after elution.On the other hand, iron(III)was determined with 5-Br-PSAA after reduction to Fe(II)with ascorbic acid.The chemical species on the adsorption was estimated to be a metal-hydroxide cation based on the elution behavior.The optimum conditions were as follows:concentration pH, 11;adsorption flow rate, 0.6ml min^-1;adsorption time, 30min;concentration tube length, 6m;5-Br-PSSA, 2.0×10^-4M(0.4ml min^-1);ascorbic acid, 0.01M(0.2ml min^-1); carrier, 0.1M HCl(0.6ml min^-1).The copper(II)was determined over the range 0.3∼16ppb;iron(III)was 0.6∼16ppb.The results of trace-amount determinations of copper(II)and iron(III)in tap water showed good agreement with the values obtained by graphite-furnace AAS and ICP-AES.

Stepwise spectrophotometric determination of trace amounts of copper and iron using a teflon-tube on-line concentration method.

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