Journal of East China Normal University(Natural Sc ›› 2004, Vol. 2004 ›› Issue (2): 69-71,8.

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Study on the Synthesis of 5-FAsA-DBF and Its Chromogenic Reaction with Thorium

XU Feng, HAO Zheng-wen, GAO Mei-rong, WU Bing-cai   

  1. Department of Chemistry,East China Normal University,Shanghai 200062,China
  • Received:2003-09-08 Revised:2004-03-02 Online:2004-06-25 Published:2004-06-25
  • Contact: WU Bing-cai

Abstract: A new chromogenic reagent 5-FAsA -DBF was synthesized and its colour reaction with thorium was studied， In a perchloric acid medium of 3.84 mol•L-1， 5-FAsA-DBF reacted with thorium to form a stable coordinate-complex， having its absorption maxima at 630 nm.Its molar absorptivity was found to be 1.63×105 L•mol-1•cm-1 .Beer’s law holds in the concentration range of 0～40 μg of Th(Ⅳ) per 25 mL of solution.The method has been apllied to determinate thorium in seafood with satisfactory results.

Key words: thioum, 5-FAsA-DBF, seafood, absorption spectrophotometry, thioum, 5-FAsA-DBF, seafood

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