双环己酮草酰二腙分光光度法测定火法冶炼镍基体料中铜

Spectrophotometric determination of copper in fire smelting nickel substrate materials with bisoxaldihydrazone

提出了一种新型材料——火法冶炼镍基体料中铜的分光光度测定方法。在pH8.9～9.4氯化铵-氢氧化铵缓冲溶中双环己酮草酰二腙(BCO)与Cu2+生成稳定的螯合物,螯合物的最大吸收波长位于600nm处。基体铁、镍以及铬、钴对铜的测定有干扰,但是,在试样用盐酸、硝酸和氢氟酸溶解和盐酸挥铬后,可以通过基体匹配和以柠檬酸隐蔽的方法消除。用本文确定的方法测定了4个实际样品中铜,相对标准偏差在1.4%～4.0%之间。采用原子吸收光谱法进行对照分析,同时选择了3个其他实验室进行验证分析,铜的结果基本一致。

The determination of copper in a novel material （fire smelting nickel substrate material） by speetrophotometry was proposed. In ammonium chloride-ammonium hydroxide buffer solution at pH 8.9--9.4, the stable chelate formed by bisoxaldihydrazone （BCO） and Cu2＋ had maximum absorption wavelength at 600 nm. The determination of copper was interfered by matrix iron, nickel, chromium and cobalt. However, after the sample was dissolved in hydrochloric acid, nitric acid and hydrofluoric acid and chromium volatilized with hydrochloric acid, the interference could be eliminated by matrix matching and citric acid masking method. The content of copper in four actual samples was determined by this method with relative standard deviation in the range of 1.4 % -- 4.0 %. The atomic absorp- tion spectrometry was used for comparison analysis. Meanwhile, the samples were also determined in three other laboratories, and the results were basically consistent.