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| Determination of Trace Copper in High Purity Indium by Graphite Furnace Atomic Absorption Spectrometry after Ion-exchange Separation |
| Received:August 20, 2013 Revised:November 11, 2013 |
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| DOI：doi:10.3969/j.issn.2095-1035.2014.01.015 |
| KeyWord:high purity indium;copper; ion-exchange separation; graphite furnace atomic absorption spectrometry |
| Author | Institution |
| WU Wenqi |
柳州出入境检验检疫局, 广西 柳州 |
| LI Fen |
柳州出入境检验检疫局, 广西 柳州 |
| XIE Xiaoyan |
柳州出入境检验检疫局, 广西 柳州 |
| SU Xinyu |
柳州出入境检验检疫局, 广西 柳州 |
| LIANG Xiaoming |
中国检验认证集团柳州分公司,广西 柳州 |
| LU Jinrong |
中国检验认证集团柳州分公司,广西 柳州 |
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| Abstract: |
| After the high purity indium sample was dissolved with hydrochloric acid, trace copper was separated through cation-exchange resin and then was determined by graphite furnace atomic absorption spectrometry. Sample dissolution procedure, ion-exchange separation and determination condition for trace copper were investigated. The optimum conditions were found as following: 1 g indium sample was dissolved with 8 mL hydrochloric acid and the solution went through ion-exchange separation with 0.6 mol/L hydrochloric acid as leacheate. The trace silver, arsenic, cadmium, silicon in the sample and most of indium matrix could be separated and removed. Then, copper was eluted with 2.0 mol/L hydrochloric acid and collected. Although trace aluminium, iron, lead, magnesium, nickel, tin, thallium, zinc in the indium with weight less than 10 μg could not be separated from copper, they had no influence on the determination of trace copper. When 1g sample was weighted and 50 μL sample was injected, the linear range of this method was 1~4 ng/mL, the detection limit was 0.1ng/mL, and the quantification limit was 0.001 μg/g which is two order of magnitude lower than 0.1 μg/g obtained by industry standard method YS/T230.1—1994.The proposed method was applied to analyze the actual sample, and the results were consistent with those obtained by inductively coupled plasma mass spectrometery (ICP-MS). The relative standard deviations (RSD，n=8）were 1.7%~18.5%, and the recoveries were 94.8%~115.0%. |
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