| Determination of Iron Content in Precipitated Silica with 1，10-Phenathrinediazine Spectraphotometry |
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| DOI： |
| Key Words: precipitated silica；1，10-phenathrinediazine；visible photometry；iron content |
| Author Name | Affiliation | | Li Zhicheng | Henan Tyre Factory |
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| Abstract: |
| An analytical method is proposed and studied for determination of the iron content in precipitated silica with 1，10-Phenathrinediazine Spectraphotometry. Its specific procedures are：first to treat the sample with hydrofluoric acid to convert the silica into a gas of silicon tetrafluoride to escape，and then at a pH value of 4 to 5 to treat the residual liquid with hydroxylamine hydrochloride to get the ferric ions reduced to ferrous ions. By the addition of 1，10-phenathrinediazine which reacts with the ferrous ions to produce an orange red complex compound，the iron content thereiwcan be determined by the use of visible photometry. Experiments show that the method is reliable in principle，simple in procedure and functions well against the interference by copper and manganese ions，and also it proves to be good in precision and accuracy. |
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