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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

The molecular ion region in the mass spectrum of a large molecule, such as a protein, consists of a cluster of peaks differing by 1 Da. This pattern occurs because a molecule with many atoms has a high probability of containing one or several atoms of C1315N,18O,2Hand 32S. In fact, the probability of finding a molecule with only C1214N,16O,1Hand 32S may be so small that the nominal molecular ion is not observed. The electrospray mass spectrum of the rat protein interleukin-8 consists of a series of clusters of peaks arising from intact molecular ions with different charge. One cluster has peaks at m/z 1 961.12, 1 961.35, 1 961.63, 1 961.88, 1 962.12 (tallest peak), 1 962.36, 1 962.60, 1 962.87, 1 963.10, 1 963.34, 1 963.59, 1 963.85, and 1 964.09. These peaks correspond to isotopic ions differing by 1 Da. From the observed peak separation, fi nd the charge of the ions in this cluster. From m/z of the tallest peak, estimate the molecular mass of the protein.

34: What is collisionally activated dissociation? At what points in a mass spectrometer does it occur?

Would the answers be different if m/z 5 500 were an ion with a mass

of 1 000 Da and z 5 2?

Chlorate (CIO-3), chlorite (CIO-2), bromate (BrO-3), and iodate (IO-3)can be measured in drinking water at the 1-ppb level with 1% precision by selected reaction monitoring. Chlorate and chlorite arise from CIO2used as a disinfectant. Bromate and iodate can be formed from Br-or I-when water is disinfected with ozone O3. For the highly selective measurement of chlorate, the negative ion selected by Q1 in Figure 22-33 is m/z 83 and the negative ion selected by Q3 is m/z 67. Explain how this measurement works and how it distinguishes CIO3-from CIO2-, BrO3-, andIO3-

(a) Explain the purpose of the dynamic reaction cell in Figure 21-30. (b) In geologic strontium isotopic analysis, there is isobaric interferencebetween 87Rb+and 87Sr+A dynamic reaction cell with CH3Fconverts Sr+to SrF+but does not convert Rb+to RbF+How does this reaction eliminate interference?
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