Methods to dissolve metal sulfides aqua regia big HAc dilut.HCl conc.HCI HNO3 (王水) MnS V ZnS,FeS X CdS PbS K pa X CuS,Ag2S X HgS X Small x:insoluble,V:solubleHAc dilut.HCl MnS CdS PbS CuS, Ag2S HgS conc.HCl aqua regia (王 水) ZnS, FeS big Small HNO3      x  x x  x x x x x x x x x            Methods to dissolve metal sulfides x: insoluble , : soluble Kspa