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在0.02M磷酸-0.08M乙酸-0.08M硼酸介质中,3-氨基-a-乙基-2,4,6-三碘氢化桂皮酸(碘番酸)有两个明晰的阴极化示波导数波,峰电位分别为-0.72伏和—0.86伏(vs.S.C.E.)。以第一波作为定量分析的基础,峰电流与浓度在5.0×10~(-7)~1.0×10~(-5)M范围内具有良好的线性关系,已成功的应用在碘番酸片剂和原药的分析中。研究了极谱波性质,反应机理和电极过程。认为获得的极谱波为吸附波,电极反应系碘番酸分子中苯环上键合的碘还原所致。电极过程不可逆。
In 0.02 M phosphoric acid-0.08 M acetic acid-0.08 M boric acid medium, 3-amino-a-ethyl-2,4,6-triiodohydrocinnamic acid (iopanoic acid) has two clear cathodic oscillographic derivatives The wave and peak potentials were -0.72 volts and -0.86 volts (vs.SCE), respectively. Taking the first wave as the basis of quantitative analysis, the peak current has a good linear relationship with the concentration in the range of 5.0 × 10 -7 -1.0 × 10 -5 M, Agents and analysis of the original drug. The polarographic wave properties, reaction mechanism and electrode process were investigated. It is considered that the polarographic wave obtained is an adsorptive wave, and the electrode reaction is caused by the reduction of the iodine bonded to the benzene ring in the iopanoic acid molecule. Electrode process is irreversible.