a. Describe the steps in QuEChERS and explain their purpose. b. Why is an internal standard used

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a. Describe the steps in QuEChERS and explain their purpose.
b. Why is an internal standard used in QuEChERS?
c. What is displayed in the total ion chromatogram in Figure 28-23?
d. What is displayed in the extracted ion chromatogram in Figure 28-23? What is the difference between an extracted ion chromatogram and a selected ion chromatogram? Which would have greater signal-to-noise ratio?
e. What mass spectrometric method could be used to obtain even greater signal-to-noise ratio from the same QuEChERS extract?

Figure 28-23

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Quantitative Chemical Analysis

ISBN: 9781319164300

10th Edition

Authors: Daniel C. Harris, Charles A. Lucy

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