Figure 3From: Novel catalytic fluorescence method for speciative determination of chromium in environmental samples Fixed time, variable time, and fluorescence-quenching behaviour studies for OHPTU-Cr(VI). (a) A fixed time study of OHPTU-Cr(VI) reaction system (at t = 25 min). (b) A variable time study of OHPTU-Cr(VI) reaction system. (c) Study of HPTU-Cr(VI) reaction system using tangents' method. (d) Study of fluorescence-quenching behaviour using Stern-Volmer plots.Back to article page