[GFAAS determination of trace lead in toothpaste using L'vov platform]

Area of Science:

• Analytical Chemistry
• Environmental Science

Background:

• Graphite furnace atomic absorption spectroscopy (AAS) is a common technique for metal analysis.
• Determining trace levels of low melting point metals, like lead, presents sensitivity challenges.
• Matrix interferences from elements such as aluminum (Al) and calcium (Ca) can affect analytical accuracy.

Purpose of the Study:

• To develop and validate a sensitive method for determining trace lead in toothpaste using graphite furnace AAS.
• To evaluate the effectiveness of the platform technique in improving lead detection sensitivity and minimizing matrix interferences.
• To optimize experimental conditions for accurate lead quantification.

Main Methods:

• Utilized the platform technique in graphite furnace AAS for trace lead determination.
• Investigated platform fabrication and coating selection.
• Compared analytical results obtained with and without the platform.
• Optimized ashing temperature, atomization temperature, and experimental parameters.
• Assessed the impact of aluminum and calcium matrix elements on lead determination.

Main Results:

• The platform technique significantly improved sensitivity for low melting point metals.
• Optimized conditions and platform use minimized interference from aluminum and calcium.
• Achieved a precision of approximately 0.9% for trace lead determination.
• Obtained a detection limit of about 15 ng for lead, a substantial improvement over non-platform methods.

Conclusions:

• The platform technique offers a superior method for trace lead analysis in complex matrices like toothpaste.
• This approach enhances analytical performance, providing more accurate and sensitive results.
• The optimized method is valuable for quality control and safety assessments of consumer products.