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The flashcards below were created by user
bkkrafft
on FreezingBlue Flashcards.
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What is the primary forensic application of Solid Phase Extraction?
analysis of toxicology samples
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How are analytes separated in SPE?
they are selectively partion on a solid due to varying degrees of interaction with the stationary phase
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T/F: In regards to SPE, as interaction of the analytes with the stationary phase increases, the slower the analytes move.
True! The greater the interaction, the slower the analyte moves; the less interaction between them, the faster the analyte moves
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KD is the _______ coefficient.
distribution
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When the KD value is large, is the concentration of analyte interaction with the stationary phase large or small?
large
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When the KD value is small, is the concentration of analyte interaction with the stationary phase large or small?
small
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What are the 4 major types of analyte-phase interactions?
Adsorption, Binding, Electrostatic, Solubility
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T/F: In SPE, the reversed phase has a polar solid phase and non-polar solvents.
False!! That is the normal phase. Reversed phase has non-polar solid phase and polar solvents.
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What are the primary forensic applications of Solid Phase MicroExtraction?
analysis of controlled substances, ignitable liquids, and explosives/ explosive residues
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True or False: SPME is particularly useful for the extraction of volatile organic compounds.
True!
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What are some of the disadvantages of SPME?
- 1. It is ideally suited for highly volatile compounds and less volatile compounds require greater heating and longer desorption times.
- 2. The solid coating of the fiber is thin and as a result the fiber is easily overloaded. When the fibers are saturated they cannot accept any more analyte.
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