Journal of Jianghan University(Natural Science Edition) ›› 2016, Vol. 44 ›› Issue (1): 48-51.doi: 10.16389/j.cnki.cn42-1737/n.2016.01.009

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An Improved Phenanthroline Spectrophotometric Method for Determination of Ferrous Iron Content in Chelated Iron

XU Xunda，HU Lu，YU Guoxian，LU Ping*   

  1. School of Chemistry and Environmental Engineering，Jianghan University，Wuhan 430056，Hubei，China
  • Online:2016-02-28 Published:2016-03-11
  • Contact: LU Ping
  • About author:路平（1958—），男，教授，硕士生导师，研究方向：工业气体净化研究。E-mail：luping203@163.com

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Abstract: An improved phenanthroline spectrophotometric method for the determination of ferrous content in chelated iron was propsed，aimed at unclear color reaction of standard HJ/T 345—2007. By improving reagent addition sequence and replacing part of water with 20 mL of ethanol，when pH of the solution was between 3 to 9，o-phenanthroline with chelated ferrous could form a stable orange red complex. The maximum absorption wavelength of the complex was 510 nm. This method can solve the problem of the unobvious color in the detection of the chelated ferrous by the standard HJ/T 345—2007 and the recovery rate of the sample was 98.0% to 102.0%.

Key words: phenanthroline, spectrophotometric method, ethanol, chelated iron

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