A sensing device includes a first sensor configured to capture a first analyte in a fluid medium and to generate a first signal in response to capturing the first analyte. The sensing device also includes a second sensor configured to capture a second analyte in the fluid medium and to generate a second signal in response to capturing the second analyte, where the second analyte is different from the first analyte. The sensing device further includes a detector configured to collect the first and second signals to provide a total signal and to calculate a total concentration of the first and the second analyte in the fluid medium based on the total signal.
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