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Summary

Samenvatting Chromatografie

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5.0
(3)
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15
Pages
11
Uploaded on
16-12-2015
Written in
2015/2016

Een samenvatting voor alle te leren stof voor het vak Chromatografie

Institution
Course








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Written for

Institution
Study
Course

Document information

Summarized whole book?
No
Which chapters are summarized?
Hoofdstuk 51 en 52
Uploaded on
December 16, 2015
Number of pages
11
Written in
2015/2016
Type
Summary

Subjects

Content preview

Samenvatting
Chromatografie



Chromatografie
is
scheiding
van
een
mengsel
van
verschillende
stoffen
in
componenten



Chromatografie
kan
worden
onderverdeeld
in:

-­‐ Preparatief:
het
scheiden
van
stoffen
op
grote
schaal


-­‐ Analytisch:
samenstellingen
van
mengsels
identificeren



Papierchromatografie:

Hoe
vaster
de
aanhechting
van
de
opgeloste
stof
aan
papiervezels,
hoe
langzamer
stof

meegesleept
wordt
door
lopend
oplosmiddel



-­‐ Stationaire
fase:
het
deel
waar
de
scheiding
plaatsvindt
(papier,
silicadeeltjes)

-­‐ Mobiele
fase:
waarmee
het
monster
opgebracht
wordt
en
zich
langs
en
in
de

stationaire
fase
voortbeweegt
(loopvloeistof)



Papierchromatografie
berust
op
de
verschillen
in
de
verdeling
over
de
mobiele
en

stationaire
fase
van
de
te
scheiden
componenten

-­‐ Componenten
hebben
verschillende
snelheden
à
scheiding



Dunne
laag
chromatografie
TLC:

-­‐ Plaatmateriaal:
glas,
aluminium,
plastic
folie

-­‐ Meestal
silica
als
drager
materiaal:
polair



!"#$%&&'()*+  !"#$ !
Retentietijd
(Rf)
=

!"#$%&&'()*+  !"#!$%

=
!
(voor
stof
A)



-­‐ Monstervoorbereiding:
monster
oplossen
in

vluchtige
stof
(ether,
pentaan
aceton)

-­‐ Referenties
gebruiken
naast
monster

-­‐ Na
opbrengen
vluchtige
stof
laten
verdampen

-­‐ Silicaplaat
met
onderzijde
in
eluens

(apolair)

-­‐ Spots
zichtbaar
maken
(UV
lamp/sprayen
vloeistof)



UV-­‐actieve
stoffen:

-­‐ Stoffen
met
π-­‐bindingen
(dubbele
bindingen)
in
een
geconjugeerd
systeem

(afwisselend
enkele
en
dubbele
bindingen)

-­‐ Zichtbaar
maken
spots



TLC
kleuring:

-­‐ Spot
zichtbaar
maken
door
sprayen
met
vloeistof

-­‐ Oxidatie
van
alcohol
naar
aldehyde



Soort
stof
achterhalen:

-­‐ Kras
vlek
incl.
silicagel
eraf

-­‐ In
oplossing
brengen

-­‐ Filtreren
(silica
kwijtraken)
$4.21
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