Abstract：The sample was dissolved with nitric acid. When the perchloric acid fume was generated to bottleneck of 150 mL conical flask for 0-5 s, the content of chromium in solution was titrated with ferrous ammonium sulfate standard titration solution in sulfuric acid-phosphoric acid medium using N-phenylanthranilic acid as indicator. The analysis method of chromium in copper alloy by ferrous ammonium sulfate titration after perchloric acid treatment was established. The dissolution method of copper alloy and indicator was tested and discussed. The results showed that the copper alloy matrix, chromium and chromium compounds could be fully dissolved by nitric acid and perchloric acid. The chromium was oxidized to chromium by HClO4·2H2O fume. The N-phenylanthranilic acid was grinded and mixed with sodium carbonate. It was dissolved with water and used as indicator. Since the blue background of copper ions in sample solution was combined with the color of indicator, the complementary purple-green around the titration endpoint was formed. The color change of indicator was sensitive. The determination of chromium was not interfered by cerium and manganese. The content of chromium in standard sample was determined according to the experimental method. The relative standard deviation (RSD, n=8) was 0.46%. The found results were consistent with the certified values. The proposed method was also applied to the determination of chromium in copper alloy sample, and the found results were consistent with those obtained by ferrous ammonium sulfate titration after ammonium persulfate oxidation.
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