A New Spectrophotometric Method for Determination of Selenium in Cosmetic and Pharmaceutical Preparations after Preconcentration with Cloud Point Extraction
Figure 4
Effect of HDZ concentration on the analytical response. Conditions: 0.2% (w/v) Triton X-100, 0.35 M HCl, equilibration time: 15 min, equilibration temperature: 40°C, and 50 ng mL−1 Se (IV).
