| 摘要 |
In an ionic activity measuring device provided with at least two solid electrodes (0) and a porous bridge (9) extending over the solid electrodes in such a manner that, when droplets are applied (to holes 10, 11) so as to contact the solid electrodes and the porous bridge, an ion contained in the droplets can move through the porous bridge, the porous bridge comprises a porous member (20) of which at least the surface remote from the solid electrodes and extending over the solid electrodes in the direction of the movement of ions through the porous member between the solid electrodes is hydrophobic. The porous member (20) may be made of a variety of materials and may be provided with a non-porous layer (22) on the surface adjacent to the solid electrodes (0). The hydrophobic surface of the porous member (9) may be formed by treating a non-hydrophobic material to impart hydrophobicity thereto. The porous member (9) is provided with liquid receiving holes (10, 11), which are positioned in such a manner that at least one hole is in registry with each solid electrode (0). The solid electrodes are ion selective and of layer construction. <IMAGE> |
