Chapter 10: Q 10.8 (page 250)
Why are ionization interferences less severe in ICP than in flame emission spectroscopy?
The ionization interferences is less severe in ICP than in flame emission spectroscopy due to the enormous amount of electrons of element argon.
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Discuss the advantages and disadvantages of sequential versus simultaneous multichannel ICP spectrometers.
Calculate the theoretical reciprocal linear dispersion of an echelle grating with a focal length of 0.85 m, a groove density of 120 grooves/mm, and a diffraction angle of 61°16r when the diffraction order is
(a) 30 and (b) 90.
Gold can be determined in solutions containing high concentrations of diverse ions by ICP-AES.33 Aliquots of 5.00 mL of the sample solution were transferred to each of four 50.0 mL volumetric flasks. A standard
solution was prepared containing 10.0 mg/L Au in 20% H2SO4, and the following quantities of this solution were added to the sample solutions: 0.00, 2.50, 5.00, and 10.00 mL added Au in each of the flasks. The
solutions were made up to a total volume of 50.0 mL, mixed, and analyzed by ICP-AES. The resulting data are presented in the following table.
(a) Use a spreadsheet to perform a least-squares analysis to determine the slope, intercept, and regression statistics, including the standard deviation about regression.
(b) Use your results to find the concentration of gold in the sample solution in mg/L.
(c) The known concentration of gold in the sample is 8.51 mg/L. Test the hypothesis that your result is equal to this value at the 95% confidence level.
Why are arc sources often blanketed with a stream of an inert gas?
Why do ion lines predominate in spark spectra and atom lines in arc spectra?
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