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碘氟法测铜简易、快速、成本低、比较准确。但由于长期大量使用氟化物,污染环境,危害人民身体健康。一些生产科研单位对此进行了许多探索,提出用磷酸盐、焦磷酸盐等代替氟化物掩蔽铁。我们从文献[1]以 Zn-EDTA 盐掩蔽铁后用光度法测铝的研究中得到启示。根据 Fe(Ⅲ)、Cu(Ⅱ)、Zn(Ⅱ)与 EDTA 形成络合物的稳定常数的差异,和酸效应系数计算,有可能控制 pH～1,以一定量 Zn-EDTA 掩蔽Fe(Ⅲ)而 Cu(Ⅱ)不被掩蔽,然后调节 pH 在3.5左右,用碘量法测铜。下面就是用上述理论联系实际问题的探讨。
Iodine fluoride method of measuring copper simple, fast, low cost, more accurate. However, due to the long-term extensive use of fluoride, pollution of the environment, endanger the health of the people. Some production and research institutes have carried on a lot of exploration to this, put forward to use phosphate, pyrophosphate instead of fluoride masking iron. We have enlightenment from the literature [1] with Zn-EDTA masking iron after spectrophotometric determination of aluminum. According to the difference of the stability constants of Fe (Ⅲ), Cu (Ⅱ), Zn (Ⅱ) and EDTA, and the acid effect coefficient, it is possible to control the pH ~ ) And Cu (II) is not masked, and then adjust the pH at 3.5 or so, measured by iodometric method of copper. The following is the use of the above theory to explore the practical issues.