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Multi-element method for determination of trace elements in sunscreens by ICP-AES
1Laboratory of Analytical Chemistry, Department of Chemistry, Aristotle University, GR 54124 Thessaloniki, Greece. zacharia@chem.auth.gr
Journal of Pharmaceutical and Biomedical Analysis
|June 6, 2009
Summary
A new method using inductively coupled plasma atomic emission spectrometry (ICP-AES) accurately analyzes titanium dioxide and other elements in sunscreens. This validated technique ensures the safety and quality of sun protection products.
Area of Science:
- Analytical Chemistry
- Environmental Science
Background:
- Sunscreen formulations require rigorous quality control for UV filters and potential contaminants.
- Titanium dioxide (TiO2) is a key inorganic UV filter in sunscreens, necessitating accurate quantification.
Purpose of the Study:
- To develop and validate an ICP-AES method for simultaneous multi-element analysis in sunscreen creams and lotions.
- To quantify titanium dioxide (Ti) and assess trace elements (Al, Zn, Mg, Fe, Mn, Cu, Cr, Pb, B) in sunscreens.
Main Methods:
- Investigated two sample pretreatment methods: acid digestion and direct slurry introduction.
- Optimized plasma parameters (argon flow rate, radiofrequency power) for improved atomization.
- Evaluated acid digestion efficiency using spiked samples and recovery rates.
Main Results:
- Acid digestion in closed pressurized vessels proved effective for complex sunscreen matrices.
- Achieved high recovery rates (95.0-101.3%) for Ti, Zn, and Fe.
- Established low detection limits (0.2-0.5 µg g⁻¹) for key elements.
Conclusions:
- The developed ICP-AES method is reliable for multi-element analysis of sunscreens.
- The method offers accurate quantification of TiO2 and trace elements, crucial for product safety and efficacy.
- Validated results against atomic absorption spectrometry, confirming method robustness.
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