7. (2pts.) Bone consists of the protein collagen and the mineral hydroxyapatite,

Question

7. (2pts.) Bone consists of the protein collagen and the mineral hydroxyapatite, Ca10(PO4)6(OH)2. The Pb content of archeological human skeletons measured by graphite furnace atomic absorption sheds light on customs and economic status of individuals in historical times. Explain why La3+ is added to bone samples to suppress matrix interference in Pb analysis.
7. (2 pts.) Bone consists of the protein collagen and the mineral hydroxy apatite, Calo(PO4)IOH) The Pb content of archeological human skeletons measured by graphite furnace atomic absorption sheds light on customs and economic status of individuals in historical times. Explain why La" isadded to bone samples to suppress matrix interference in Pb analysis

Explanation / Answer

Bone consists of the protein coollagen . La3+ is very useful for suppressing matrix interference in Pb analysis . The reason is given as following.

La3+ acts as a releasing agent by tightly binding to P043-   and freezing Pb2+.

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