用硝酸溶解试样，在pH 6.0~7.0范围内，用三氯甲烷萃取丁二酮肟镍与铜基体分离。以盐酸反萃取镍。在碱性介质中，氧化剂存在下，镍与丁二酮肟形成络合物，在波长480nm处测定吸光度。0.2~2μg·mL-1范围内符合朗伯-比尔定律，回收率达100.7%，所测镍量范围为0.001%~0.010%。%Using nitric acid to dissolve the sample, pH was 6.0~7.0, dimethylglyoxime-nickel was separated from copper matrix by chloroform extraction. Hydrochloric acid was used to extract nickel. In alkaline medium, at the presence of oxidizing agent, nickel and dimethylglyoxime formed complex, the absorbance was measured at the wavelength of 480nm. In range of 0.2μg/mL~2μg/mL, the absorbance was accorded with Lambert-Beer’s law, the recovery was 100.7%, the nickel content range was 0.001%~0.010%.
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