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He P.-H.,Henan Nuclear Industry Radioactive Nuclide Test Center | Zhang W.,Henan Nuclear Industry Radioactive Nuclide Test Center | Yang Z.,Henan Nuclear Industry Radioactive Nuclide Test Center
Yejin Fenxi/Metallurgical Analysis | Year: 2013

The sample was dissolved by aqua regia, foam separated and enriched by polyurethane, and then analyzed by thiourea solution of 20 g/L. A method for determination of trace gold in button batteries by graphite furnace atomic absorption spectrometry was established. The gold was determined with ascorbic acid solution of 20 g/L as matrix modifier. The detection conditions of graphite furnace atomic absorption spectrometry was optimized with 700°C and 1700°C as ashing and atomization temperature, respectively, which shortened the measurement time and extended the life of graphite tube. The results showed that the gold element in button batteries was less than 10 ng/g, RSD was less than 10% and the recovery was between 88% and 112%. Detection limit was 0.15 ng/g. The method was suitable for determination of trace gold in electronic components.


Yang Z.,Henan Nuclear Industry Radioactive Nuclide Test Center | Sun Y.-S.,Henan Nuclear Industry Radioactive Nuclide Test Center | He P.-H.,Henan Nuclear Industry Radioactive Nuclide Test Center | Zhang Y.-L.,Henan Nuclear Industry Radioactive Nuclide Test Center | Zhang W.,Henan Nuclear Industry Radioactive Nuclide Test Center
Yejin Fenxi/Metallurgical Analysis | Year: 2013

After the sample was leached in dilute acetic acid and the filtered residue was extracted with AlCl3 solution, the calcium fluoride content in the extract was determined by inductively coupled plasma atomic emission spectrometry. Under the selected instrument conditions, interference tests for AlCl3 and F- were conducted, and the results showed that the presence of AlCl3 interfered with the determination of Ca, but determination could be conducted after matrix matching by adding AlCl3 into the standard solution. As verified with the certified reference materials, the proposed method achieved high accuracy and precision and the determined values of calcium fluoride in the certified reference materials of fluorite ore were consistent with the certified values, the relative standard deviation (n=6) being less than 1%. Compared with traditional methods, the proposed method is simple, rapid and suitable for rapid determination of calcium fluoride in fluorite ore.

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