The mechanism of the hydrolysis of polyphosphates. V. The effect of cations on the hydrolysis of pyro- and triphosphates.

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概要

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• The effect of cations on the rate of hydrolysis of pyro- and triphosphates was studied by adding metal chloride to aqueous solutions of the phosphates. The concentrations of the phosphates and metal chlorides were 0.025 and 0.1 mol dm<SUP>−3</SUP> respectively. Alkali metal, alkaline earth metal, aluminium, and some transition-metal (Mn(II), Co(II), Ni(II), Cu(II), and Zn(II)) cations retarded the hydrolysis of the phosphates in acidic media. The following sequence of efficiency resulted:<BR>trivalent>bivalent>univalent.<BR>The efficiency of elements within one group of the periodic table decreased from top to bottom. On the other hand, in alkaline solutions, alkali metal cations accelerated the hydrolysis of the phosphates and the catalytic effectiveness decreased with an increase in the ionic radius.

• 公益社団法人 日本化学会の論文

著者

• Matsuura Makoto

  Department Of Anatomy Iwate Medical University School Of Medicine

• Watanabe Makoto

  Department of Analytical Chemistry of Medicines, Showa Pharmaceutical University

• Yamada Tamotsu

  Department of Industrial Chemistry, Chubu Institute of Technology

• Matsuura Makoto

  Department of Industrial Chemistry, Chubu Institute of Technology

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