Measure the intensity of the fluorescence (2.2.21) of the test solution (I1), of the standard (I2) and of the blank (I3) using an excitant beam at 392 nm and a secondary filter with a transmission band centred on 518 nm or a monochromator set to transmit at this wavelength. The fluorescence (I1- I3) of the test solution is not greater than that of the standard (I2- I3).
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