Chapter 10: Q 10.9 (page 250)
What are some of the advantages of plasma sources compared with flame sources for emission spectrometry?
Elements have lower interferences and their emission spectra are obtained quite easily.
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What is an internal standard and why is it used?
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.
Describe three ways of introducing a sample into an ICP torch.
What is an internal standard and why is it used?
What are the relative advantages and disadvantages of ICP plasmas compared to microwave plasmas?
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