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本文研究了在微酸性介质中用抗坏协酸还原Fe（Ⅲ），Fe（Ⅱ）与1，10-二氮杂菲（phen）形成Fe（phen）32+配合物，加入ClO4-阴离子与之形成离子缔合物，再用有机溶剂硝基苯萃取，火焰原子吸收测定有机相。本法检出限为1．1ng／mL，回收率为98．5％－106％。
In this paper, Fe (Ⅲ), Fe (Ⅱ) and 1,10-phenanthroline (Fe) complexes were formed by the reduction of arsenic in a slightly acidic medium with Fe (Ⅲ) The formation of ion-association, and then organic solvent nitrobenzene extraction, flame atomic absorption measurement of the organic phase. The detection limit of 1.1ng / mL, the recovery rate of 98.5% -106%.