GF-AAS technique is commonly used for the analysis of mineral and trace elements in biological samples, e.g., Pb in bones samples.Usually bones were weighed and diluted 1:10 with nitric acid, then the samples were mineralizednin a microwave oven.
I think this recent paper could be useful, it is open access
best regards
stefania
Article Comparison of trace element concentration in bone and interv...
Thanks Stefania for answer the question about sample preparation of bone samples, I can only add that quality of acid is very important in this type of research.
Wojciech if you have more questions please contact me: [email protected]