HW Questions Flashcards
What statistical term is used to express accuracy?
Relative Error
When is a standard addition method preferred?
When the matrix is more complex
What type of chromotagraphy, separation is based on the molecular size of analytes?
Gel Permeation Chromatography
Adsorption chromotography can be seen in what type of chromatography?
LSC and GSC
Which gas is NOT suitable for use as a GC carrier gas?
Oxygen
What sample introduction method would you use to inject a gaseous sample into GC for quantitative analysis?
A rotary gas sample valve of and SPME fiber
What are desirable properties for a liquid stationary phase in GC?
Volatile, thermally stable, and chemically inert
A diode array detector (DAD) is adventageous in HPLC because:
it covers a range of wavelengths
In reversed-phase HPLC:
a hydrophobic stationary phase is combined with a polar mobile phase
What type of wavelength selectors are best to be used for spectral scanning?
Monochromators
Which of the following materials is best to be used to construct sample containers for UV region?
Quartz
In which instrument, two wavelength selectors are used?
Flame-Atomic Fluorescence Spectrometer (F-AFS)
Which electronic transition(s) is possible in a water molecule (H2O)?
σ → σ* and n → σ*
What is a bathochromic shift?
The shifting of an absorption to longer wavelength
