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Summary

Samenvatting instrumentele chemie (deel 1 spectrofotometrie)

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samenvatting slides + schema's

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Uploaded on
December 1, 2022
Number of pages
11
Written in
2021/2022
Type
Summary

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Spectrofotometrie
Principe
 Valentie-elektronen




 Lambert Beer: A = a.C.b

Onderdelen apparatuur
1. Stralingsbron
- VIS → Wolfraam
→ Halogeen/Tungsten
- UV → Waterstof
→ Deuterium
- UV-VIS → Xenon
2. Golflengteselector
- Filters → Verwijderen ongewenste golflengtes
o Absorptie
o Interferentie
- Monochromators → Instellen gewenste golflengte
o Rooster
o Prisma
3. Cuvet
- UV → Kwarts
- VIS → Glas
→ Plastic
→ Kwarts
4. Detector
- FMB
- Silicium fotodiode

Output
Kwantitatief bepalen van de concentratie uit de absorptie




x-as → golflengte 
𝐼0
y-as → absorbantie A = log 𝐼 met I < I0

, Nefelometrie/turbidimetrie
Principe
Nefelometrie → Verstrooiing (Mie/Rayleigh)


Meer deeltjes

 Meer verstrooiing
 Intensiteit signaal 
~ Concentratie



Turbidimetrie → Schijnbare lichtabsorptie


T = k.b.C
𝐼0
A = log met I < I0
𝐼




Onderdelen apparatuur
→ Nefelometrie: fluorimeter/laser nefelometer

→ Turbidimetrie: colorimeter/spectrofotometer

1. Lichtbron
Hoge intensiteit:
- Laser
- Xenon
2. Cuvet
(Ag, AL), stollingsfactoren, geen enzymen
3. Detector
FMB

Output
Kwantitatief

Toepassingen
- Klinische chemie → IgG, IgM, IgA, Ag, AL, EW
- Anorganische analyse → neerslag (Cl-, SO42-, …)
- Dranken, verf, inkt, …
- Latex agglutinatie
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