Figure 1: (a) Emission spectra obtained for 8 standard solutions of terazosin with different concentrations. (b) Emission spectrum of terazosin (75 μg L−1) treated the same as previously described in the general analytical procedure (a), and emission spectrum of reagent blank in [Hpy][PF6] ionic liquid (b). Inset: chemical structure of [Hpy][PF6] ionic liquid. Experimental conditions were as indicated in the Table 1.