The titration of aqueous solutions of heteropoly acid H 3PW 12 O 40 (PW 12 ) with bases MOH(M=Li +,Na +,K +,Mg +,Ca 2+ ) was monitored by 31 P NMR.

• 介绍了31 P核磁共振监测下 ；MOH(M =Li+ ；Na+ ；K+ ；Mg+ ；Ca2 + )滴定不同浓度的H3PW1 2 O4 0(简称PW1 2 )的水解情况 .