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    • 16. 发明授权
    • Carbonate selective membrane and electrode
    • 碳酸盐选择膜和电极
    • US4810351A
    • 1989-03-07
    • US41391
    • 1987-06-01
    • Eddy ChapoteauW. James Scott
    • Eddy ChapoteauW. James Scott
    • G01N27/333G01N27/46
    • G01N27/3335
    • The carbonate ion selective membrane of the invention comprises (a) a polymeric inert support material; (b) a plasticizer effective to solubilize the support material; (c) a quaternary ammonium ion; (d) an ionophore which is preferentially reactive with carbonate ions; and (e) a hydrophobic molecule effective to exclude ions other than carbonate ions. The addition of a hydrophobic molecule to the membrane formulation serves two purposes. First, it assists in the "binding" of the organic constituents to the matrix. Second, it repels charged species, i.e., anions and cations, from the solution phase, thereby improving selectivity to the carbonate species which enters the membrane via selective complexation with the ionophore. The quaternary ammonium ion is preferably a C.sub.7 to C.sub.9 quaternary ammonium ion. In this case, the plasticizer is selected to be one effective to maximize the binding of carbonate ions with the C.sub.7 C.sub.9 quaternary ammonium ions. The invention further provides a carbonate ion selective electrode comprising an internal reference element in electrochemical contact with the membrane described above.
    • 本发明的碳酸盐离子选择性膜包括(a)聚合惰性载体材料; (b)有效溶解载体材料的增塑剂; (c)季铵离子; (d)优先与碳酸根离子反应的离子载体; 和(e)有效排除碳酸根离子以外的离子的疏水性分子。 向膜配方中加入疏水性分子有两个目的。 首先,它有助于有机成分与基质的“结合”。 其次,它从溶液相中排斥带电物质,即阴离子和阳离子,从而通过与离子载体的选择性络合来提高对进入膜的碳酸盐物质的选择性。 季铵离子优选为C 7〜C 9季铵离子。 在这种情况下,增塑剂被选择为使碳酸根离子与C 7 C 9季铵离子结合最大化的增塑剂。 本发明还提供一种碳酸盐离子选择性电极,其包括与上述膜电化学接触的内部参考元件。