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CHAPTER 18 SAMPLE PREPERATION (solid-phase extraction (solid-phase…
CHAPTER 18
SAMPLE PREPERATION
liquid phase = solvent extraction
equilibrium state (equation :question:)
K D versus D
play with pH values to change D
Percent extracted
% E
, with 2 ex in the slides
solvent extraction of metals
non-polarized to make metal ions into organic phase
metal chelates :question:
outside layer of metal ions
with color = easy for detection
D
K
liquid-phase microextraction (LPME)
equilibrium state (of between what) :question:
playing with pH :question:
Dispersive liquid-liquid phase Micro Extraction (DLLPME)
two phases
three phases
ex: playing with pH
Hollow Fiber Liquid Phase Micro Extraction
solid-phase extraction
very often used
silica = the base
ion exchange in chromatography
solid-phase cartridge
4 steps
conditioning
retention
rinse
elution
many different solid-phase extractions available :question:
solid-phase microextraction (
SPME
)
obtain equilibrium state before inject into chromatography :question:
require
: fixed time and fixed temperature :red_flag:
to avoid the variation in extraction's results.
some examples of SPME fibers
Extraction
: seperate one from another completely
norlally includes 2 phases and they are both NOT MOVE
Versus
seperation
for example 2 phases but one MOVE and one NOT MOVE