Which Statement Regarding Capillary Electrophoresis Sample Injection Is INCORRECT

question 15

Multiple Choice

Which statement regarding capillary electrophoresis sample injection is INCORRECT?

• A)Hydrodynamic injection uses a pressure differential between the two ends of the capillary to inject a volume of sample onto the capillary.
• B)Electrokinetic injection uses an electric field to inject a volume of sample onto the capillary.
• C)For electrokinetic injection,each analyte has a different  _app,so the composition of the loaded sample is different from the original sample.
• D)For quantitative work,an internal standard is essential because the amount of sample injected is not reproducible between runs.
• E)Stacking concentrates the sample cations and anions in the sample at the interfaces between the sample plug and run buffer.

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