Next, to determine the detection limit, different volumes of H2S were injected into 1mL of dichloromethane containing CdSe/CdS QDs (OD570 =∼0.03).
Fig. 3C shows that 2mL of 100ppm H2S can partially quench the fluorescence and 4mL of 100ppm H2S can
quench the orange fluorescence completely (Fig. 3E).
Thus, our result shows that the detection limit is approximately 2mL of 100ppm H2S.