In an optical sensing (optode) system for the measurement of PO2 using fluorescence,what is being measured?
A) The increase in the intensity of the oxygen's natural fluorescence
B) The amount of charge passing between the optical sensing electrodes,which is directly proportional to the PO2
C) The decrease in intensity of an organic dye's fluorescence in the presence of molecular oxygen,which is proportional to the PO2
D) The ability of oxygen in solution to carry current under the influence of a potential difference
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