Cromatografía De Gases

GAS CHROMATOGRAPHY
In this task I want to determine different compounds and find out value of concentration of my sample using gas chromatography. For this, I will inject volumes of Methane, C5-C9, 2-Methyl-2-propanol, Cyclohexane, propyl acetate, Methylbenzene (Toluene), 2-Methyl-2-ethylbutyrane and 1,4-Dimethylbenzene.
I will determine the composition of Benzin (qualitative) using ret.time, and the concentration of Toluene in my sample (Quantitative), using Standard addition method with areas of peaks.

Parameters of Chromatograph:
l=25 metres
Diameter=0,31 mm r=0,155 mm=1,55·〖10〗^(-4) m
D_f=0,52 μm
SF=5% Phenyl,95% Methyl Polysiloxane
Tables and qualitative determination
Methane: It’s a gas, so I will inject 20 μl.

Ret. time
1 2,303
2 2,297
3 2,293
4 2,2975 2,293
Average 2,297

Volumetric flow rate=(π·r^2·L)/t_m =(π·2,4·〖10〗^(-8)·25)/137,82=1,37·〖10〗^(-8) m/sec
Linear flow rate=L/t_m =25/137,82=0,181 m/sec

C5-C9: Liquid, inject 0,5 μl

Ret. time C5 Ret. time C6 Ret. time C7 Ret. time C8 Ret. time C9
1 2,507 2,740 3,213 4,170 6,083
2 2,493 2,727 3,200 4,153 6,057
3 2,503 2,740 3,210 4,163 6,063
4 2,500 2,737 3,207 4,160 6,063
52,490 2,727 3,197 4,147 6,050
Average 2,499 2,734 3,205 4,159 6,063
Organic compounds

1 2 Average
2-Methyl-2-Propanol 2,527 2,520 2,524
Cyclohexane 3,037 3,027 3,032
Propyl acetate 3,253 3,243 3,248
Methylbenzene (Toluene) 3,890 3,890 3,890
2-methyl-2-ethylbutyrane 4,770 4,767 4,769
1,4-Dimethylbenzene 5,613 5,563 5,588

Benzin: I have 11 different peaks.

1 2 3 4 5 6 7 8 9 1011
1 2,473 2,547 2,617 2,660 2,697 2,853 2,983 3,037 3,107 3,173 3,447
2 2,477 2,543 2,613 2,657 2,697 2,853 2,983 3,037 3,107 3,173 3,447
3 2,477 2,537 2,607 2,650 2,690 2,847 2,977 3,030 3,100 3,164 3,440
Average 2,476 2,542 2,612 2,656 2,695 2,851 2,981 3,035 3,105 3,170 3,445

Peak 1: 2,476≃2,499□( →┬() ) C5
Peak 2: 2,542≃2,524 □(→┬( ) ) 2-Methyl-2-Propanol
Peak 3: 2,612≈?□(→┬( ) )?
Peak 4: 2,656≈?□(→┬() )?
Peak 5: 2,695≈2,734□(□(→┬( ) )) C6
Peak 6: 2,851≈?□(□(→┬() )?)
Peak 7: 2,981≈?□(□(→┬( ) )?)
Peak 8: 3,035≈≃3,032□(□(→┬() )) Cyclohexane
Peak 9: 3,105≈?□(□(→┬( ) )?)
Peak 10: 3,170≈3,205□(□(→┬( ) )) C7
Peak 11:3,445≈?□(□(→┬( ) )?)
Tables and quantitative determination. Standard addition method
I will have chromatography determination of concentration using the area of peaks in a standard addition method. I will draw a graphic of A_T/A_C vs....