Figure 6.

(a) Emission spectra of the HPTS/PMVP₄₁-b-PEO₂₀₅ complex in water in the presence of increasing amounts of SDBS; (b) The relationship between the emission intensity and the concentration of SDBS from 5 to 100 nM. R = 0.9903; (c) Emission spectra of the HPTS, HPTS/PMVP₄₁-b-PEO₂₀₅ complex and polyion complex in a model system of natural water which contains different surfactants, including SDS, SL, SDBS and simple organic ions. [SDBS] = 100 nM; [SDS] = [SLS] = 200 nM; [KCl] = [NaCl] = [KNO₃] = 0.2 mM. PMVP is the abbreviation of PMVP₄₁-b-PEO₂₀₅. [PMVP₄₁-b-PEO₂₀₅] = 0.6 μM; [HPTS] = 0.1 μM. Excitation wavelength: 405 nm.