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本文研究了四苯基卟啉和一些金属离子的络合反应条件和反应速度;研究了铜、铅、锌及镉离子和四苯基卟啉所形成的络合物的稳定性,并测定了它们的组成;研究了这些络合物的吸收光谱及同时测定这些金属离子的合适波长,确定光度检测的条件;研究了络合物的色谱行为和可能的干扰,确定了反相色谱分离条件。 在上述研究的基础上提出同时测定这些金属元素的反相液相色谱法。方法快速,精密度好,变异系数在0.62—3.5％之间。最低检出量为0.04ngCd,0.16ngPb,0.20ngCu和0.005ngZn。本文提出的方法已成功地应用于锡基合金及电镀废水中铜、铅、锌和镉的测定,准确度好.
In this paper, the complexation reaction conditions and reaction rates of tetraphenylporphyrin and some metal ions were studied. The stability of the complex formed by copper, lead, zinc and cadmium ions and tetraphenylporphyrin was studied. Their composition, the absorption spectra of these complexes were studied, and the suitable wavelengths of these metal ions were simultaneously determined to determine the conditions of photometric detection. The chromatographic behavior and possible interference of the complexes were studied and the conditions of reversed-phase chromatographic separation were determined. On the basis of the above studies, the simultaneous determination of these metal elements by reversed-phase liquid chromatography. The method is rapid, the precision is good, the coefficient of variation is between 0.62-3.5%. The minimum detectable amount of 0.04ngCd, 0.16ngPb, 0.20ngCu and 0.005ngZn. The proposed method has been successfully applied to the determination of copper, lead, zinc and cadmium in tin-based alloys and electroplating wastewater with good accuracy.