Surfactant Sensitized Calix[4]arenes Fluorescence Quenching Method for Speciation of Cr(VI)/Cr(III) in Water Samples

Figure 4

Fluorescence  spectra. (1) TRCA (3.4×10⁻⁵mol/L) +CTAB; (2) Cr(VI) (1.00 μg/mL) +TRC (3.4×10⁻⁵mol/L) +CTAB; (3) TRCA (3.4×10⁻⁵mol/L) +H₂O; (4) Cr(VI) (1.00 μg/mL) +TRCA (3.4×10⁻⁵mol/L) +H₂O.