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Chapter 22: Q3TY (page 574)
Would the answers be different if m/z 5 500 were an ion with a mass
of 1 000 Da and z 5 2?
No the answer will be same.
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Bone consists of the protein collagen and the mineral hydroxyapatite,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 whyis added to bone samples to suppress matrix interference in analysis.
Bone consists of the protein collagen and the mineral hydroxyapatite,. The content of archaeological humanskeletons measured by graphite furnace atomic absorption shedslight on customs and economic status of individuals in historicaltimes. 37 Explain why La3+is added to bone samples to suppressmatrix interference in Pbanalysis.
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
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.
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?
(b)The vacuum in an orbital mass separator is 1028 Pa. Find the mean free path in the orbital for the same conditions as (a).
(a) Explain the purpose of the dynamic reaction cell in Figure 21-30. (b) In geologic strontium isotopic analysis, there is isobaric interferencebetween and A dynamic reaction cell with converts to but does not convert to How does this reaction eliminate interference?
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