Elucidation of molybdosilicate complexes in the molybdate yellow method by ESI-MS

Mariko Takahashi, Yoshihiro Abe, Miho Tanaka

研究成果: Article査読

12 被引用数 (Scopus)


The formation of molybdosilicate in the molybdate yellow method is elucidated by ESI-MS. Polymeric silicic acids were hydrolyzed to monomers, and molybdosilicates with a Keggin structure were formed. Each step of the formation reaction of molybdosilicate from molybdic and silicic acids between pH 1 and 2 was clarified by ESI-MS at the molecular level. In a solution below pH 0.5, the polymers of the molybdic acids were decomposed because of the high concentration of sulfuric acid. Excess sulfuric acid prevented the formation of molybdosilicate. Thus, none of the silicic acids reacted to form molybdosilicate at this pH, despite the presence of silicic acid and sulfate ions in the solution. Above pH 2, the condensation of molybdic acids occurred to form α-molybdosilicate. ESI-MS provides information on the formation of molybdosilicate and the individual reaction species present in the reaction mixture.

出版ステータスPublished - 2015 1月

ASJC Scopus subject areas

  • 分析化学


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