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This research dealt with the intensification of Pt–Rh separation via liquid–liquid extraction (LLE). The stock solution contained Pt(IV) and Rh(III) at high concentration level in hydrochloric solution: 625ppm and 104ppm, respectively. Tri-octylamine (TOA) in toluene was used as an extractant. For single stage extraction, the separation factor was 135 with 8wt% TOA. The percentage of extraction was...