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铜磁铁矿样品用适宜比例的HCl、HNO3、HCl O4、HF混合酸低温消解,待样品溶解完全后,在适宜酸度下,用抗坏血酸将Cu2+还原为Cu+,在N,N-二甲基甲酰胺的存在下,使Cu+与2,2′-联喹啉络合生成可溶性的紫红色络合物,采用分光光度法于548 nm波长处测量其吸光度。实验中考察了酸度、试剂用量、显色时间、共存离子的干扰等实验条件的影响,在选定的实验条件下,铜的线性范围为0-8.0μg/m L,方法检出限为0.0028μg/m L。将该方法用于铜磁铁矿中铜的测定,分析结果与标准物质的标准值和原子吸收光谱法的测量值基本相符,相对标准偏差为0.78%-1.69%,表示该方法适用于高硫、高磷和富铜的磁铁矿中铜含量的测定。
The samples of copper magnetite were digested with the appropriate mixture of HCl, HNO3, HClO4 and HF at low temperature. After the sample was completely dissolved, Cu2 + was reduced to Cu + with ascorbic acid under suitable acidity. Amide complex, Cu + is complexed with 2,2’-biquinoline to form a soluble purplish red complex, and its absorbance is measured spectrophotometrically at a wavelength of 548 nm. Under the selected experimental conditions, the linear range of copper is 0-8.0μg / m L, the detection limit of the method is 0.0028 μg / m L. The method was applied to the determination of copper in copper magnetite. The analytical results were in good agreement with the standard values of the standard materials and the measured values of atomic absorption spectrometry with relative standard deviations of 0.78% -1.69%, indicating that the method is suitable for high sulfur , Determination of copper content in high-phosphorus and copper-rich magnetite.