Is a method better if the LOD (limit of detection) and LLOQ (lower limit of quantitation) are of lower concentrations? Why or why not? Explain in detail.
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Is a method better if the LOD (limit of detection) and LLOQ (lower limit of quantitation) are of lower concentrations? Why or why not? Explain in detail.
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- Why high-resolution monochromator is needed for atomic emission spectroscopy while atomic absorption spectroscopy requires a monochromator having only low-to-moderate resolving power?What is peak multiplicity and how does multiplicity arise?(a) Three components in a mixture have varying distribution constants between the mobile phase and the stationary phase. One of the components has a very high distribution constant. Would this component likely elute first or last and how would you design an experiment or modify the components of the separation to make it perform in the opposite manner? (b) One way to dramatically increase the sensitivity of a quadrupole mass spectrometer is to use a technique called selected ion monitoring (SIM). Explain how this technique works and why it improves sensitivity. Explain what dwell time means. Be sure to draw a diagram and describe how this analysis scheme works. Also, is there a compromise between a wide range of masses scanned and SIM? Explain in easy details.
- Instrumentation of IR spectroscopy? Please answer at your own words.What are the processes of concentrate samples analysis in Uv-visible spectroscopy? Please shortly answer at your own words. Answer should be to the point.Flame emission spectroscopy sometimes suffers from the difficulties of self-absorptionand self-reversal. Explain a method to ensure the validity of your experiment.
- Explain why an internal standard is required during sample preparation in quantitative analysis when using atomic spectroscopy?Induction coupled plasma (ICP) emission spectrometry is widely used for the sensitive multi-element determinations. How does the ICP work?1. Discuss the importance and precautions in using glass cuvettes. 2. Explain in your own understanding the principles of UV-Vis Spectrometer.
- When analyzing a selution component by UV-visible spectrophotometry. we prepare solutions with a range of concentrations by serial dilution. Why do we need to analyze a range of solutions? To allow multiple determinations of absorbance at different wavelengths and different concentrations To provide more than one determination of absorbance for a given concentration To see how absorbance varies with concentration To ensure that the linear relationship between absorbarce and concentrasion is velid for a range of concentrations.Peak or band broadening is more likely to occur in: gradient elution or isocratic elution?
