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本文介绍了一种用卟啉化合物为显色剂的双波长吸光光度法测定纯金属中痕量铜的新方法。四-(对三甲铵苯基)卟吩与铜(Ⅰ)的络合物在较高酸度下仍能保持稳定,而其他金属离子的络合物均被破坏,这一特点改善了该试剂测铜的选择性,从而使测定得到了令人满意的结果。另外,本文结合应用一些简便的富集方法,并采用双波长测定法,使灵敏度提高至5.2×10~5。
In this paper, a new method for the determination of trace copper in pure metals by dual-wavelength absorptiometry using porphyrin as chromogenic reagent was introduced. The complex of tetrakis (p-trimethyl ammonium) porphine and copper (Ⅰ) remained stable at higher acidity while the complexes of other metal ions were destroyed, a feature that improved the reagent Copper selectivity, so that the determination has been satisfactory results. In addition, this paper combined with some simple enrichment methods, and the use of dual-wavelength assay, the sensitivity increased to 5.2 × 10 ~ 5.