????? ????? metatungstate ??????? ??????? paratungstate ??????? ????? ??? ????????:
(?) ????? paratungstate ??????? ???? ?? ????? ?????? ??? ????? ????? ???? ?? metatungstate ???????;
(?) ????? ?????? ???? ?? metatungstate ??????? ????? ????? ????? ?? metatungstate ???????; (?) ????? ????? ?????? ????? ?? metatungstate ??????? ??? ????? ???? ?? metatungstate ???????.

? ????? ?? ??????? ???? paratungstate: ??? ?????? ?????? ??? ? preheated ??? ??????; [5 (NH4) 2O12WO35H2O] ??????? ??????? ???? ??????? ??????? ?? 150 ?? 200 ?"? / ??? ??? ?????; ???? ??????? ?? paratungstate ??????? ????, 1: 3 ???? ????? ?????? (HNO3) ??? ????? ??????? ??? ????? ?? ?????? ? pH 3 ?? 5; ?? ?????? ??"? ??? ???? ???? ????? WO3 ?? ?????? ???? ? 150 ??? / l; ???? ?????? ???????? ???? ??? ???, ??????? ?????? ????? ???? ????? ?????? ????, ?? ??? ????? ????? ????? ?? metatungstate ???????.

B. ???? ?? ????? ???? ?? metatungstate ??????? ?????? ????? ?? metatungstate ???????: ?????? ???? ?? metatungstate ??????? ???? ? ???? ??? ???? 4 ????, ?????? ????? ???? ????? ??? ????? ????? 1; ?? ?????? ???? 1 ??? ???? ???? ???? ????? ???? ?????? ??? ???? ????, ??? ??? ?? ?????? 1 ??? ????, ??? ?????? ???? (NH3H2O) ?? 1: 5 ???? ??? ?????? ?? ?????? ? pH 3 ?? 4; ???? ??????? ?? ?????? ???? 2, ?? ????? ?? ????? 1 ??? ????, ???? 1 ??? ?? ?????, ??????? ???? ????? ??? ???? ????? ?????? ???? ???? ??? ???? ????? 2; ?? ?????? ???? 2 ??? ???? ???? ???? ?????, ???? ??? ???? 8 ????, ??? ??????? ???? ????? ??? ???? ????? ???? ????? ???? ????? ?????? ??? ???? ????? ????? ?? metatungstate ???????.

C. ????? ????? ?? ?????? ????? ?? metatungstate ???????: ?????? ????? ?? metatungstate ??????? ???? B ????? ????? ???? ?? metatungstate ??????? ?? ??? ????? ?????????? ???? ????? ??????? ????? ???? ????? ????? ?? ????? ????? ?????. ?????? ?????? ????? ???? ??: ????? ???????? ?????? 220 ?? 280 ° C., ???????? ?????? ???? 110-160 ° C., ?????? ????? 300-400 ?"? / ???.