Application of supercritical fluid extraction in nuclear waste treatment is very appealing to nuclear industry,because it can sharply reduce the secondary liquid waste generated.Here,an apparatus with online UV-Vis monitor is established for complexation reaction research in Application of supercritical fluid extraction in nuclear waste treatment is very appealing to nuclear industry, because it can sharply reduce the secondary liquid waste generated. Here, an apparatus with online UV-Vis monitor is established for complexation reaction research in