用极谱法测定铁已往已有不少报道。选用洒石酸氢钠(pH=6.8)、柠檬酸钠(pH=5)、三乙醇胺——氢氧化钠——乙二胺为底液,所生成的铁的络合物在汞电极表面上均可产生还原波,可用于定量测定铁。M. E. Beret等选用0.3M三乙醇胺——0.2M NaOH和0.2M洒石酸铵(pH=9)作底液,以交流极谱法测定铁,其灵敏度和分辨率都有了较大的提高。但以方便的玻璃碳电极代替滴汞电极作指示电极进行导数脉冲极谱测 Polarographic determination of iron has been reported in the past. The sodium hydroxide (pH = 6.8), sodium citrate (pH = 5) and triethanolamine-sodium hydroxide-ethylenediamine were used as the bottom liquid. The complex of iron formed on the mercury electrode surface Can produce reduction wave, can be used for quantitative determination of iron. M. E. Beret and other selected 0.3M triethanolamine - 0.2M NaOH and 0.2M ammonium tartrate (pH = 9) as the bottom of the liquid, the AC polarographic determination of iron, the sensitivity and resolution have been greatly improved. However, a convenient glassy carbon electrode instead of droplet mercury electrode as the indicator electrode for derivative pulse polarography