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Chapter 22: Q9P (page 600)

Bone consists of the protein collagen and the mineral hydroxyapatite,Ca10(PO4)6(OH)2. The 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

Phytoplankton at the ocean surface maintain the fluidity of their cell membranes by altering their lipid (fat) composition when the temperature changes. When the ocean temperature is high, plankton synthesize relatively more 37:2 than 37:364O⏟37:2=C37H70O(CH2)11(CH2)5CH)13CH3

After they die, plankton sink to the ocean fl oor and end up buried insediment. The deeper we sample a sediment, the further back into time we delve. By measuring the relative quantities of cell-membrane compounds at different depths in the sediment, we can infer the temperature of the ocean long ago. The molecular ion regions of the chemical ionization mass spectra of 37:2 and 37:3 are listed in the table. Predict the expected intensities of M, M11, and M12 for each of the four species listed. Include contributions from C, H, O, and N, as appropriate. Compare your predictions with the observed values. Discrepant intensities in these data are typical unless care is taken to obtain high-quality data.

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

Draw a rearrangement like reaction D in figure 22-12 to show how m/z 58 arises from 4-methyl-2-pentanone.
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