| Using the sealed digestion method of ethanolamine hydroxyl platinum, and content of platinum in sample was determined by SnCl2 spectrophotometry. The results showed that 3 mL ptoctanoate tlimer sample could be digested completely with 12 mL HNO3 and 3 mL H2O2 at 160℃ in a PTFE Jar for 6 h. In hydrochloric acid medium, Pt(IV)-SnCl2 forms a orange stable complex with stannous chloride. The platinum sample was determined by spectrophotometry at the wavelength of 403 nm, the result shows Beer’s Law is obeyed in the range of 0~20 mg/L. The samples of hydroxyl ethanolamine platinum were determined for Pt content from 35.8~42.55 g/L, the relative standard deviations (RSD) and the recoveries of standard addtion are 0.072%~0.11% and 99.3%~102.8%, respectively. The result is coincided with that of the amperometric titration and ammonium chloroplatinate gravimetry. |
