A New Spectrophotometric Method for Determination of Selenium in Cosmetic and Pharmaceutical Preparations after Preconcentration with Cloud Point Extraction
Figure 6
Effect of equilibration time on the complexation of Se (IV) with dithizone. Conditions: 0.2% (w/v) Triton X-100, 7.5 μmol l−1 HDZ, 0.35 M HCl, equilibration temperature: 40°C and 50 ng mL−1 Se (IV).
