Bone-lead analysis: development of analytical methodology for milligram samples

Area of Science:

• Analytical Chemistry
• Environmental Science
• Toxicology

Background:

• Lead (Pb) is a toxic heavy metal with significant health implications.
• Accurate quantification of Pb in biological matrices like bone is crucial for exposure assessment.
• Existing methods for bone Pb analysis may require larger sample sizes or more complex procedures.

Purpose of the Study:

• To develop and validate a sensitive graphite platform-in-furnace atomic absorption spectrometric (GFAAS) method for determining lead (Pb) in small primate bone samples.
• To establish a reliable and efficient analytical procedure for Pb quantification in both cortical and trabecular bone.
• To assess the accuracy and precision of the developed GFAAS method.

Main Methods:

• Ambient temperature nitric acid digestion of 10-20 mg primate bone samples.
• Matrix modification using palladium nitrate.
• Stabilized temperature platform furnace atomization with optimized temperature programming.
• Mandatory use of the method of standard additions for quantification.
• Validation using IAEA bone reference material (H-5) and isotope dilution mass spectrometry (IDMS).

Main Results:

• The GFAAS method achieved a detection limit of 0.19 µg Pb/g dry weight for a 10-mg sample.
• The method demonstrated good accuracy and precision, validated against certified reference materials and IDMS.
• The procedure is simple, fast, and minimizes contamination risk by performing all steps in a single centrifuge tube.

Conclusions:

• The developed GFAAS method is suitable for the accurate determination of microgram/g levels of Pb in small primate bone samples (10-20 mg).
• This technique offers a sensitive, reliable, and efficient approach for bone lead analysis, applicable to both adult and fetal specimens.
• The simplicity and contamination-free nature of the method make it valuable for toxicological and environmental health studies.