应用化学 ›› 1991, Vol. 0 ›› Issue (4): 86-89.

• 研究简报 • 上一篇    下一篇

微量铁的吸附伏安法测定

张晓丽, 王丽增, 魏沛玲, 陈荣礼   

  1. 山东大学化学系, 济南 250100
  • 收稿日期:1990-07-09 修回日期:1990-11-05 出版日期:1991-08-10 发布日期:1991-08-10

DETERMINATION OF TRACE AMOUNT OF IRON BY ADSORPTION VOLTAMMETRY

Zhang Xiaoli, Wang Lizeng, Wei Peiling, Chen Rongli   

  1. Department of Chemistry, Shandong University, Jinan 250100
  • Received:1990-07-09 Revised:1990-11-05 Published:1991-08-10 Online:1991-08-10

摘要: 在NH3-NH4Cl-三乙醇胺底液中用5-Br-PADAP催化极谱法测定铁的检测下限为2.8×10-8mol/L[1]。本文利用吸附伏安法,先进行吸附富集,形成的Fe-5-Br-PADAP在HAc-NaAc介质中产生灵敏的络合吸附峰,将检测下限提高到4.0×10-10mol/L。

关键词: 铁, 微量分析, 吸附伏安法

Abstract: A sensitive adsorptive wave of Fe-5-Br-PADAP complex was obtained by linear sweepvoltammetry in HAc-NaAc solution.The peak potential is -0.05V (vs.SCE).The peakcurrent is directly proportional to the concentration of Fe(Ⅲ) in the range of 2.0×10-9~1.0×10-7mol/L, the detection limit is 4.0×10-10 mol/L.The adsorption phenomena wereobserved, the electrode reaction appeared an irreversible reduction of the complex, whichhas a composition of 1:2 with apparent stability constant 1.3×1012.This method has beenapplied to analysis of food, drinks and grain crops.

Key words: iron, microanalysis, adsorption voltammetry