temperature controlled oven, door opened to show column
capillary column from injector exit to detector
Slide 3
Types of GC Column Packed Column Capillary Column
Slide 4
Packed Column stainless steel, nickel, glass, plastics,
aluminium. Internal diameter 1.6 to 9.5 mm Length is often 1-3 m
Limited Resolution (N< 8,000) Internal column diameter should be
at least eight times the diameter of the support particles Densely
packed with packing materials or solid support coated with thin
layer of stationary liquid phase Diatomaceous earth Size: 60-80
mesh (250-170 m) or 80-100 mesh (170-149 m)
Slide 5
Packed Column
Slide 6
Capillary Column Internal diameter 1 mm or less. typically
Jawab Apiezon: dietil keton-> 1-butil bromida -> metil
sikloheksana (kenapa 1-butil bromida keluar setelah dietil keton?)
OV-17: metil sikloheksana -> dietil keton -> 1-butil bromida
Carbowax: metil sikloheksana -> 1-butil bromida -> dietil
keton (kenapa dietil keton keluar lebih lama dibandingkan 1-butil
bromida?)
Slide 61
Soal 2 Urutan elusi propanol, 1-propil asetat dan 1-heptana
pada kolom apiezon, ov-17 dan carbowax
Slide 62
Jawab Apiezon: propanol -> 1-propil asetat -> 1-heptana
OV-17: propanol -> 1-heptana -> 1-propil asetat (kenapa
1-heptana keluar lebih dulu daripada 1-propil asetat?) Carbowax:
1-heptana -> 1-propil asetat -> propanol
Slide 63
Soal 3 Mengapa resolusi yang baik dengan nilai Rs minimal 1,5?
Mengapa dalam GC tekanan sangat penting dan tekanan gas pembawa
harus konstan?