| 摘要 |
<p>The invention provides a sensor, adapted for the selective detection of cations of a specific valence state, derived from metals capable of existing in more than one valence state, said detector comprising a quartz crystal microbalance which comprises a quartz crystal sandwiched between two electrodes used to generate an alternating electric field across the crystal, the surface of said quartz crystal microbalance being coated with a polymer impregnated with ligands having a high degree of sequestration specificity towards cations of a specific valence state, and the sensor being adapted to provide a variable potential such that changes in the valence state of the sequestered cations may be induced. The invention also provides a method for the identification can quantitative determination of cations in a composition, said cations having a specific valence state and being derived from metals capable of existing in more than one valence state; additionally, the invention provides methods for removing cations from such a composition and for resolubilising the sequestered cations.</p> |
