Question

Bone consists of the protein collagen and the mineral hydroxyapatite,${\mathrm{Ca}}_{10}{\left({\mathrm{PO}}_4\right)}_6{\left(\mathrm{OH}\right)}_2$The content of archaeological human skeletons measured by graphite furnace atomic absorption sheds light on customs and economic status of individuals in historical times 37 . Explain why${\mathrm{La}}^{3+}$is added to bone samples to suppress matrix interference in analysis.

Short answer

${\mathrm{La}}^{3+}$appears to be a releasing agent, as it preferentially reacts with${\mathrm{PO}}_4^{2-}$,releasing${\mathrm{Pb}}^{2+}$

Step-by-step solution

Define release agent.

A release agent (also known as a release coating, release agent, or mould release coating) is a substance that prevents other materials from adhering to surfaces. Mould release, die-cast release, plastic release, adhesive release, tyre and web release are all procedures where it can help.

Explain why La3+is added to bone samples to suppress matrix interference in  Pb analysis.

To avoid the chemical matrix effect,${\mathrm{La}}^{3+}$is employed. By creating thermally stable compounds,${\mathrm{PO}}_4^{2-}$prevents the atomization of${\mathrm{Pb}}^{2+}.{\mathrm{La}}^{3+}$appears to be a releasing agent, as it preferentially reacts with${\mathrm{Po}}_4^{2-}$, releasing${\mathrm{Pb}}^{2-}$