A New Spectrophotometric Method for Determination of Selenium in Cosmetic and Pharmaceutical Preparations after Preconcentration with Cloud Point Extraction
Figure 3
Effect of HCl concentration on the corrected absorbance of the complex. Conditions: 0.2% (w/v) Triton X-100, 7.5 μmol l−1 HDZ, equilibration time: 15 min, and equilibration temperature: 40°C and 50 ng mL−1 of Se (IV).
