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| DETERMINATION OF PHOSPHORUS IN Ag-Cu ALLOY |
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| DOI： |
| KeyWord:phosphorus;sulfide precipitation method;photometric method;molybdenum blue;bismuth salt;Ag-Cu alloy.; |
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| Beijing General Research Institute of Mining & Metallurgy;Beijing 100044 China |
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| Abstract: |
| When sample is dissolved with nitric acid and perchloric acid,metaphosphoric acid in solution is oxided into orthophosphoric acid.The interferences of Ag,Cu,Pb and As are eliminated by sulfide precipitation method.Reacting with ammonium molybdate under the catalyst of bismuth salt,phosphorus is transferred yellow ammonium phosphomolybdate.The ammonium phosphomolybdate is reducted into phosphomolybdenum blue by ascorbic acid.Then the content of phosphorus is determined with photometric method.The maximum abs... |
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