Vacuum Distillation Separation/Enrichment and Inductively Coupled Plasma-Atomic Emission Spectrometry for Determination of Platinum
A method was established for the determination of platinum in lead samples by ICP-AES after separated and enriched by vacuum distillation. Under the condition of vacuum, platinum and lead can be separated at high temperature because of their different vapor pressures. The enriched platinum was determined by ICP-OES after dissovled, and also lead was recovered in vacuum. Theoretical feasibility of the vacuum distillation method and the influence factors such as temperature, time and pressure have been studied. The results indicated that content of platinum in residue is higher than 99.01% under the conditions of temperature of 1250 K, pressure of 30 Pa and time of 3 h. The detection limit (3σ) was 0.0069 mg/L with relative standard deviations of 1.7%. A wide linear range of 0.023-20 mg/L and the recovery of 99.8%-103.0% were obtained.