title: [Studies on hydroxyfluoran and its derivatives as organic reagents. XIV. Spectrophotometric determination of Th(IV), Zr(IV) and F- with 3,4,-5,6-tetrachloro 3',4',5',6'-tetrahydroxyfluoran methyl ester].
mesh_terms: D001572:Benzofurans; D005461:Fluorine / Q000032:analysis*; D007202:Indicators and Reagents; D007783:Lactones; D013053:Spectrophotometry; D013910:Thorium / Q000032:analysis*; D014966:Xanthenes; D015040:Zirconium / Q000032:analysis*
chemical_list: D001572:Benzofurans; D007202:Indicators and Reagents; D007783:Lactones; D014966:Xanthenes; D005461:Fluorine; D013910:Thorium; D015040:Zirconium