A New Spectrophotometric Method for Determination of Selenium in Cosmetic and Pharmaceutical Preparations after Preconcentration with Cloud Point Extraction
Figure 5
Effect of Triton X-100 concentration on the cloud point extraction. Conditions: 7.5 μmol l−1 HDZ, 0.35 M HCl, equilibration time: 15 min, equilibration temperature: 40°C, and 50 ng mL−1 Se (IV).
