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Chapter 22: Q12P (page 600)

Bone consists of the protein collagen and the mineral hydroxyapatite, Ca10(PO4)6(OH)2. The Pb content of archaeological humanskeletons measured by graphite furnace atomic absorption shedslight on customs and economic status of individuals in historicaltimes. 37Explain why La3+ is added to bone samples to suppressmatrix interference in Pbanalysis.

Short Answer

Expert verified

La3+ appears to be a releasing agent, as it preferentially reacts with PO42- , releasing Pb2+ .

Step by step solution

01

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.

02

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

To avoid the chemical matrix effect, La3+ is employed. By creating thermally stable compounds, PO42- prevents the atomization of Pb2+ . La3+ appears to be a releasing agent, as it preferentially reacts with PO42-, releasing Pb2+ .

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Most popular questions from this chapter

Explain what is meant by spectral, chemical, ionization, and isobaric interference.

30: (a)The mean free pathis the average distance a molecule travels before colliding with another molecule. The mean free path, l, is given by l 5 kT/(12sP), where kis Boltzmann’s constant, Tis temperature (K), Pis pressure (Pa), and s is the collision cross section. For a molecule with a diameter d, the collision cross section is pd2. The collision cross section is the area swept out by the molecule within which it will strike any other molecule it encounters. The magnetic sector mass spectrometer is maintained at a pressure of |1025 Pa so that ions do not collide with (and deflect) one another as they travel through the mass

analyzer. What is the mean free path of a molecule with a diameter of 1 nm at 300 K in the mass analyzer?

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What resolving power is required to distinguishCH3CH2+fromHC=O+?

Measure the resolving power m/m1/2from the 31Ppeak in Figure 22 10.
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