| CPC G01N 15/06 (2013.01) [G01N 2015/0687 (2013.01); G01N 2015/1026 (2024.01); G01N 21/65 (2013.01)] | 20 Claims |

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1. A method of selectively monitoring ions in a fluid medium using a sensor, the method comprising the step of adjusting an operating frequency of the sensor to a particular resonant frequency for targeting resonance of specific ions in the fluid medium.
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