| The Karstedt’s catalyst was difficult to be dissolved because of the organic compounds containing carbon and silicon. By using sealed digestion technique in the mixture of hydrochloride acid - nitric acid - hydrofluoric acid at 150℃ for 7 hours, the sample was dissolved, and the carbon and silicon was removed. The concentration of platinum in the solution was detected by inductively coupled plasma atomic emission spectrometry (ICP-AES), and the results were not disturbed by the impurities. For Karstedt’s catalysts with platinum concentration range of 500~20000 μg/g, the relative standard deviation (RSD) was less than 2%, and the recovery was 96.3%~103.6%. The results of determination were in agreement with the nominal values, meeting the requirements for analysis in production. |
