Fluorescence intensity was taken of 2.0 mL of the 10 μg/mL quinine standard solution into five 25 mL volumetric flasks. Into one, place 1.0 mL of 0.05 M sodium bromide solution and dilute to the mark with 0.05 M sulfuric acid solution. Similarly, add 2.0, 4.0, 8.0, and 16.0 mL of the sodium bromide solution to the remaining flasks before diluting to volume with the sulfuric acid solution. Why did the fluorescence intensity decrease as the concentration of sodium bromide increased?

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